Butte County, CA: risk-assessment baseline packet, release 2026-10

Summary

Plan status as of 2026-09-30: Approved, expires 2030-02-03. Plan: Butte County (FEMA plan 110324), approved 2025-02-04.

Since the plan was approved on 2025-02-04: no new hazard declaration and 28 NOAA Storm Events records; details under "What changed since your last plan".

Highest expected annual loss (FEMA National Risk Index, modeled total; see B1-a): Inland Flooding ($48,235,634 a year), Earthquake ($33,542,704) and Drought ($26,485,232).

The tables that follow are organized by the items of FEMA's Local Mitigation Plan Review Tool, Element B (B1-a to B2-c); each heading says which item its tables support.

Terms used

EAL:: expected annual loss: FEMA's modeled average yearly loss from a hazard.
NRI:: FEMA's National Risk Index (version 1.20, December 2025).
NFIP:: National Flood Insurance Program.
RL, SRL:: repetitive loss and severe repetitive loss: flood-insured properties with repeated claims (definitions in B2-c).
FMA, HMGP:: Flood Mitigation Assistance and Hazard Mitigation Grant Program, FEMA mitigation grants.
PA:: FEMA Public Assistance: disaster aid to governments and some nonprofits.
Zone-level:: NOAA logged the event for a National Weather Service forecast zone, which may include parts of neighboring counties.
County-coded:: NOAA logged the event to this county.
FIPS:: the federal code for a place; 06007 is this area.
D0 to D4:: U.S. Drought Monitor categories, from abnormally dry (D0) to exceptional drought (D4).
F/EF, EFU:: Fujita and Enhanced Fujita tornado ratings; EFU is an unrated tornado.
kt, CONUS:: knots (1 kt is about 1.15 mph); the contiguous United States.
CFR:: Code of Federal Regulations.
A4-a, E1-a:: other items of FEMA's Local Mitigation Plan Review Tool (sources, and changes since the last plan).
Dollars:: nominal (as reported, labeled with the year), not adjusted for inflation.

Plan clock

Status:: Approved, expires 2030-02-03
Plan:: Butte County (FEMA plan 110324)
Approved:: 2025-02-04
Days to expiry:: 1,222

What changed since your last plan (approved 2025-02-04)

New federal declarations:: none
Storm Events records since approval:: 28 records (data through 2026-06-30)
Repetitive loss now:: FMA RL 1, SRL 6 (44 CFR 77.2); any definition: 38
Repeat-flood change:: this release sets the baseline count.

Sources: 1, 2, 4, 6 (numbered list at the end)

Plan status for every jurisdiction listed in this county: 21 rows, in the section "Plan clock: Plan status for every jurisdiction listed in this county" on the following pages.

State plan status and tribal plans in this state: see the state page.

Plan clock

Plan status for every jurisdiction listed in this county

Source: 1

Jurisdiction	Type	Status	Plan	Approved	Expires	Days to expirynegative = days since expiry	Notes
Butte County	County	Approved, expires 2030-02-03	Butte County (FEMA plan 110324)	2025-02-04	2030-02-03	1,222
Biggs city	City	Approved, expires 2030-02-03	Butte County (FEMA plan 110324)	2025-02-04	2030-02-03	1,222	this jurisdiction approved 2025-02-20
Chico city	City	Approved, expires 2030-02-03	Butte County (FEMA plan 110324)	2025-02-04	2030-02-03	1,222
Gridley city	City	Approved, expires 2030-02-03	Butte County (FEMA plan 110324)	2025-02-04	2030-02-03	1,222	this jurisdiction approved 2025-03-13
Oroville city	City	Approved, expires 2030-02-03	Butte County (FEMA plan 110324)	2025-02-04	2030-02-03	1,222
Paradise town	Town	Approved, expires 2030-02-03	Butte County (FEMA plan 110324)	2025-02-04	2030-02-03	1,222
Butte County Fire Safe Council	Fire/EMS District	Approved, expires 2030-02-03	Butte County (FEMA plan 110324)	2025-02-04	2030-02-03	1,222
Butte County Office of Education	School/School District	Approved, expires 2030-02-03	Butte County (FEMA plan 110324)	2025-02-04	2030-02-03	1,222	this jurisdiction approved 2025-06-12
Butte County Resource Conservation District	Other	Approved, expires 2030-02-03	Butte County (FEMA plan 110324)	2025-02-04	2030-02-03	1,222
Chico Area Recreation and Park District	Other	Approved, expires 2030-02-03	Butte County (FEMA plan 110324)	2025-02-04	2030-02-03	1,222	this jurisdiction approved 2025-02-20
Durham Irrigation District	Flood Control District	Approved, expires 2030-02-03	Butte County (FEMA plan 110324)	2025-02-04	2030-02-03	1,222
Enterprise Rancheria	Tribal	Approved, expires 2030-02-03	Butte County (FEMA plan 110324)	2025-02-04	2030-02-03	1,222	this jurisdiction approved 2025-02-06
Lake Madrone Water District	Other	Approved, expires 2030-02-03	Butte County (FEMA plan 110324)	2025-02-04	2030-02-03	1,222
North Yuba Water District	Water/Sewer Authority	Approved, expires 2030-02-03	Butte County (FEMA plan 110324)	2025-02-04	2030-02-03	1,222
Paradise Irrigation District	Flood Control District	Approved, expires 2030-02-03	Butte County (FEMA plan 110324)	2025-02-04	2030-02-03	1,222
Paradise Recreation and Park District	Special District	Approved, expires 2030-02-03	Butte County (FEMA plan 110324)	2025-02-04	2030-02-03	1,222
Sacramento River Reclamation District	Other	Approved, expires 2030-02-03	Butte County (FEMA plan 110324)	2025-02-04	2030-02-03	1,222
South Feather River Water and Power Agency	Electric/Power Authority	Approved, expires 2030-02-03	Butte County (FEMA plan 110324)	2025-02-04	2030-02-03	1,222	this jurisdiction approved 2025-02-26
Sutter Butte Flood Control Agency	Flood Control District	Approved, expires 2030-02-03	Butte County (FEMA plan 110324)	2025-02-04	2030-02-03	1,222	this jurisdiction approved 2025-02-20
Thermalito Water and Sewer District	Water/Sewer Authority	Approved, expires 2030-02-03	Butte County (FEMA plan 110324)	2025-02-04	2030-02-03	1,222	this jurisdiction approved 2025-02-20
Yankee Hill Fire Safe Council	Fire/EMS District	Approved, expires 2030-02-03	Butte County (FEMA plan 110324)	2025-02-04	2030-02-03	1,222

Supports FEMA checklist item B1-a: hazard identification

Hazards NRI does not cover (local data needed)

dam failure (incl. upstream dams)
levee failure
flash flood as its own subtype
ice jams
debris flows
erosion (riverine and coastal)
land subsidence and sinkholes
expansive soils

The 18 National Risk Index hazards, ranked by expected annual loss (EAL)

Sources: 5, 6

Rank by EAL	Hazard	NRI risk rating	EAL rating	EAL buildingsmodeled dollars per year	EAL agriculturemodeled dollars per year	Cost of expected deaths and injuriesFEMA's dollar value per year, not property damage	EAL total (see note)modeled dollars per year	Storm Events records, 1996 to 2026-06-30count	Why this hazard can be left outNRI Not Applicable, no declaration and no Storm Events record since 1996	Storm Events coverage note
1	Inland Flooding	Relatively Moderate	Relatively Moderate	$48,181,841	$47,331	$6,462	$48,235,634	107
2	Earthquake	Relatively Moderate	Relatively High	$25,015,698	n/a	$8,527,006	$33,542,704			Storm Events does not record earthquakes.
3	Drought	Very High	Very High	n/a	$26,485,232	n/a	$26,485,232	40
4	Wildfire	Relatively High	Relatively High	$15,181,433	$1,794	$891,763	$16,074,989	32
5	Heat Wave	Relatively Moderate	Relatively Low	$1,452	$2,462	$1,427,719	$1,431,633	31
6	Lightning	Relatively Moderate	Relatively Moderate	$20,496	n/a	$379,519	$400,015	4
7	Tornado	Relatively Low	Relatively Low	$289,233	$1,385	$98,455	$389,073	8
8	Landslide	Relatively Moderate	Relatively Moderate	$208,095	n/a	$179,550	$387,646	5
9	Hail	Relatively Low	Very Low	$84,708	$10,341	$25,926	$120,975	9
10	Strong Wind	Very Low	Very Low	$13,843	$15,796	$50,899	$80,538	58		Includes 38 High Wind and 12 Strong Wind records (NOAA non-thunderstorm wind types, outside NRI's Strong Wind definition).
11	Winter Weather	Relatively Low	Relatively Low	$522	under $1	$20,531	$21,053	241
12	Volcanic Activity	Very Low	Very Low	$1	n/a	$391	$392	0		No recorded events in Storm Events since 1996 (data through 2026-06-30).
13	Avalanche	Very Low	Very Low	$5	n/a	$71	$76	0		No recorded events in Storm Events since 1996 (data through 2026-06-30).
14	Cold Wave	No Rating	No Expected Annual Losses	$0	$0	$0	$0	15		Includes 6 Frost/Freeze records (outside NRI's Cold Wave definition; counted in this table and in B1-d, not in the B1-e descriptor).
	Coastal Flooding	Not Applicable	Not Applicable					0		Declared 1 time; no Storm Events record of this type.
	Hurricane	Not Applicable	Not Applicable					0	NRI rates hurricane Not Applicable for this county, and no counted federal declaration for this county names it (EM-3248-CA names it but is not counted as a local occurrence; see B1-d).	No recorded events in Storm Events since 1996 (data through 2026-06-30).
	Ice Storm	Not Applicable	Not Applicable					0		Declared 1 time; no Storm Events record of this type.

Total = buildings + agriculture + population equivalence; FEMA values each expected death (or 10 injuries) at $13.7 million (2024 dollars).

NRI risk rating combines expected annual loss with social vulnerability and community resilience; EAL rating rates expected annual loss alone. Both compare this county with all U.S. counties.

Local data needed: state and local volcanic activity records (Storm Events records this hazard only in part).

Not applicable to this county per NRI, with no federal declaration and no Storm Events record since 1996: tsunami. That is the evidence for leaving them out of the plan.

The state hazard mitigation plan also lists hazards for this county; FEMA asks the plan to explain any hazard it leaves out.

Supports FEMA checklist item B1-b: hazard location

Affects the whole county (national data give no location within it): Cold Wave, Drought, Hail, Heat Wave, Ice Storm, Lightning, Strong Wind and Winter Weather.

Inland Flooding: The FEMA Flood Insurance Rate Map (FIRM) is the required location source for flooding. See the FEMA Flood Map Service Center (https://msc.fema.gov) for this county.

Hazards that vary within the county: highest-rated census tracts

Source: 5

Hazard	Highest-rated census tractsNRI risk rating, score 0 to 100
Avalanche	tract 19 (Very Low, 16.7); tract 25 (Very Low, 16.4); tract 24.02 (Very Low, 16.2)
Coastal Flooding	no tract has a National Risk Index rating for this hazard
Earthquake	tract 10 (Very High, 98.9); tract 13 (Relatively High, 96.8); tract 15 (Relatively High, 96.7)
Hurricane	no tract has a National Risk Index rating for this hazard
Landslide	tract 24.02 (Relatively High, 99.8); tract 24.01 (Relatively High, 99.7); tract 16.02 (Relatively Moderate, 99.2)
Tornado	tract 10 (Relatively Low, 31.1); tract 28 (Relatively Low, 30.4); tract 15 (Relatively Low, 30.0)
Volcanic Activity	tract 9.04 (Very Low, 86.3); tract 3 (Very Low, 86.2); tract 15 (Very Low, 85.9)
Wildfire	tract 24.02 (Very High, 99.8); tract 17.04 (Very High, 99.4); tract 16.01 (Very High, 99.3)

Up to 3 census tracts per hazard, highest National Risk Index rating first, then highest score; a tract number is the Census tract number (for example 19 is Census Tract 19). FEMA's Resilience Analysis and Planning Tool maps the National Risk Index for every tract: https://www.fema.gov/emergency-managers/practitioners/resilience-analysis-and-planning-tool

Supports FEMA checklist item B1-c: hazard extent

Extent: scale, observed range and worst recorded event per hazard

Sources: 6, 7

Hazard	Scale	Recordscount and years	Observed range	Worst recorded event	Most damaging (when different)	How it applies to jurisdictions	Note
Avalanche	none (count and damage only)	0
Coastal Flood, Storm Surge/Tide	none in data (flood depth: FIRM)	0					Flood depth: see the FEMA Flood Insurance Rate Map.
Cold/Wind Chill, Extreme Cold/Wind Chill	wind chill	9 records, 1998 to 2023 (9 zone-level)	2 days to 11 days (median 4 days); 3 with a recorded value	11 consecutive days, 1998-12-19 to 1998-12-29, zone-level		Countywide (zone-level records).	Cold/Wind Chill records from May to September (a frost night, not a cold wave) are counted but not used for the longest run.
Frost/Freeze (outside NRI's Cold Wave definition)	crop damage	6 records, 2006 to 2024 (6 zone-level)		No crop damage reported in 6 records.		Countywide (zone-level records).
Drought	U.S. Drought Monitor scale (D0 to D4)	40 records, 2015 to 2023 (40 zone-level)	27 days to 460 days (median 61 days); 8 with a recorded value	460 days (about 15.1 months), 2021-10-08 to 2023-01-10, a run of 16 consecutive Storm Events drought records, zone-level		Countywide (zone-level records).	Storm Events enters a drought at D2 or worse east of the Rockies and D3 or worse from the Rockies west (NWS Instruction 10-1605); NRI drought counts D3 and D4 only.
Earthquake	Modified Mercalli (local data)	0					Storm Events does not record earthquakes; the USGS earthquake catalog is the source.
Hail	hail size (inches)	11 records, 1986 to 2023	0.25 in to 1 in (median 1 in); 11 with a recorded value	1 in hail, 2016-10-02; same size also recorded on 2001-02-22	Hail, 2019-03-23, $1,000 property; $0 crops (2019 dollars)	Event records naming jurisdictions in the plan: Chico city (3 records), Oroville city (2 records), Paradise town (2 records).
Excessive Heat, Heat	heat index (in event narratives)	31 records, 1999 to 2026 (31 zone-level)	1 day to 12 days (median 3 days); 28 with a recorded value	12 consecutive days, 2024-07-02 to 2024-07-13, zone-level		Countywide (zone-level records).
Hurricane, Tropical Storm, Tropical Depression	Saffir-Simpson	0					Storm Events files every zone of a storm's episode under the storm's type; flooding from the storm is filed as Flood or Flash Flood records.
Ice Storm	Sperry-Piltz ice scale (local data)	0
Flash Flood, Flood, Lakeshore Flood	damage and flood days (flood depth: FIRM)	107 records, 1996 to 2026 (7 zone-level)		Flood, 2017-02-12, $549,000,000 property; $0 crops (2017 dollars)		Event records naming jurisdictions in the plan: Chico city (6 records), Biggs city (3 records), Oroville city (3 records), Paradise town (1 record). Zone-level records (7) apply countywide.	Flood depth: see the FEMA Flood Insurance Rate Map. Storm Events damage is often $0 or blank for floods, major ones included; FEMA Public Assistance by declaration (B1-d) shows which floods cost the most.
Debris Flow	none (count and damage only)	5 records, 2017 to 2019		Debris Flow, 2017-01-09, $4,260,000 property; $0 crops (2017 dollars)		No event record names a jurisdiction in the plan.
Lightning	annualized frequency (the measure FEMA's Local Mitigation Planning Handbook names)	4 records, 2007 to 2019		Lightning, 2007-06-05, $80,000 property; $0 crops (2007 dollars)		Event records naming jurisdictions in the plan: Chico city (1 record), Gridley city (1 record), Paradise town (1 record).	Storm Events lists lightning with damage or casualties.
High Wind and Strong Wind (outside NRI's Strong Wind definition)	wind speed (kt and mph)	50 records, 1996 to 2025 (50 zone-level)	25 kt (29 mph) to 87 kt (100 mph) (median 45.5 kt (52 mph)); 50 with a recorded value	87 kt (100 mph), measurement type not recorded, High Wind, 1996-01-01; NWS zone CAZ016	High Wind, 2008-01-04, $7,110,000 property; $30,000,000 crops (zone total, 2008 dollars)	Countywide (zone-level records).
Thunderstorm Wind	wind speed (kt and mph)	12 records, 1978 to 2023	43 kt (49 mph) to 78 kt (90 mph) (median 50 kt (58 mph)); 10 with a recorded value	78 kt (90 mph), measurement type not recorded, Thunderstorm Wind, 1978-06-15	Thunderstorm Wind, 2019-09-18, $4,000,000 property; $0 crops (2019 dollars)	Event records naming jurisdictions in the plan: Chico city (2 records), Biggs city (1 record), Oroville city (1 record).
Tornado	Enhanced Fujita (Fujita before Feb 2007)	18 records, 1970 to 2023	F/EF0 to F/EF2 (median F/EF0); 16 with a recorded value	F2 tornado, 1994-02-10, 0.3 mi path length (whole path, pre-1996), 20 yd wide, $5,000,000 property; crops not recorded (1994 dollars), 2 direct injuries		Event records naming jurisdictions in the plan: Oroville city (3 records), Biggs city (1 record), Chico city (1 record).	Before 1996 a tornado is listed once, under the county where it began, with its whole path's rating and length; from 1996 on, each county lists its own segment. Length is not used to rank tornadoes (see Methods).
Volcanic Ash, Volcanic Ashfall	Volcanic Explosivity Index (local data)	0
Wildfire	acres burned (local data)	32 records, 1999 to 2024 (28 zone-level)		Wildfire, 2018-11-08, $17,000,000,000 property; $0 crops (2018 dollars), 86 direct deaths, 12 direct injuries (reported for the zone); NWS zone CAZ066		Event records naming jurisdictions in the plan: Chico city (1 record), Oroville city (1 record). Zone-level records (28) apply countywide.
Winter Storm, Heavy Snow, Blizzard, Lake-Effect Snow, Winter Weather, Sleet	none in data (snowfall: local data)	241 records, 1996 to 2026 (241 zone-level)		Winter Storm, 2018-03-15, $150,000 property; $0 crops (2018 dollars); NWS zone CAZ068		Countywide (zone-level records).

In event narratives only (local data needed): wind chill, temperature, heat index, ice thickness, acres burned and snow depth; any physical measure of avalanche, debris flow, lightning and volcanic ash, volcanic ashfall.

Storm Events records are more complete after 1996; before 1996 only Tornado (from 1950), Hail and Thunderstorm Wind (from 1955) exist. Zone-level records from zones that no NWS zone-county file places in this county (mostly before 2020) are not counted here (the Methods page explains the zone matching).

Dollars are nominal (as reported), labeled with the year; not adjusted for inflation.

Supports FEMA checklist item B1-d: previous occurrences

Federal declarations for this county: 39 declarations covering 28 separate hazard incidents counted in this packet (declarations for the same incident count once; non-natural and evacuation-only declarations are not counted).

Federal disaster declarations for this county

Sources: 1, 2, 3

Declared	Incident began	FEMA number	Type	Title	Mapped hazard	County Public Assistancefederal share obligated, nominal dollars	Flags	Notes
2024-07-25	2024-07-24	FM-5519-CA	Fire management	Park Fire	Wildfire	no Public Assistance recorded	in the 12 months before plan approval; within last 5 years
2024-07-02	2024-07-02	FM-5502-CA	Fire management	Thompson Fire	Wildfire	no Public Assistance recorded	in the 12 months before plan approval; within last 5 years
2024-04-13	2024-01-31	DR-4769-CA	Major disaster	Severe Winter Storms, Tornadoes, Flooding, Landslides, and Mudslides	Inland Flooding; Landslide; Tornado; Winter Weather	$322,004.32	in the 12 months before plan approval; within last 5 years
2023-04-03	2023-02-21	DR-4699-CA	Major disaster	Severe Winter Storms, Straight-Line Winds, Flooding, Landslides, and Mudslides	Ice Storm; Inland Flooding; Landslide; Strong Wind; Winter Weather	$804,827.77	within last 5 years
2023-03-10	2023-03-09	EM-3592-CA	Emergency	Severe Winter Storms, Flooding, Landslides, and Mudslides	Inland Flooding (primary); also designated: Landslide, Winter Weather	no Public Assistance recorded	within last 5 years	same incident as DR-4699
2023-01-14	2022-12-27	DR-4683-CA	Major disaster	Severe Winter Storms, Flooding, Landslides, and Mudslides	Inland Flooding (primary); also designated: Landslide, Winter Weather	$2,806,051.70	within last 5 years
2020-09-09	2020-08-17	FM-5363-CA	Fire management	Bear Fire	Wildfire	no Public Assistance recorded		same incident as DR-4558
2020-08-22	2020-08-14	DR-4558-CA	Major disaster	Wildfires	Wildfire	$10,059,340.54
2020-03-22	2020-01-20	DR-4482-CA	Major disaster	COVID-19 Pandemic	Non-natural, not counted	$6,112,258.43
2020-03-13	2020-01-20	EM-3428-CA	Emergency	COVID-19	Non-natural, not counted	no Public Assistance recorded		same incident as DR-4482
2019-05-17	2019-02-24	DR-4434-CA	Major disaster	Severe Winter Storms, Flooding, Landslides, and Mudslides	Inland Flooding; Landslide; Winter Weather	$1,757,151.39
2018-11-12	2018-11-08	DR-4407-CA	Major disaster	Wildfires	Wildfire	$143,542,231.28
2018-11-09	2018-11-08	EM-3409-CA	Emergency	Wildfires	Wildfire	no Public Assistance recorded		same incident as DR-4407
2018-11-08	2018-11-08	FM-5278-CA	Fire management	Camp Fire	Wildfire	no Public Assistance recorded		same incident as DR-4407
2017-10-10	2017-10-08	DR-4344-CA	Major disaster	Wildfires	Wildfire	$106,138
2017-10-09	2017-10-09	FM-5218-CA	Fire management	La Porte Fire	Wildfire	no Public Assistance recorded		same incident as DR-4344
2017-10-09	2017-10-08	FM-5216-CA	Fire management	Cascade Fire	Wildfire	no Public Assistance recorded		same incident as DR-4344
2017-07-09	2017-07-07	FM-5189-CA	Fire management	Wall Fire	Wildfire	no Public Assistance recorded
2017-04-01	2017-02-01	DR-4308-CA	Major disaster	Severe Winter Storms, Flooding, and Mudslides	Inland Flooding (primary); also designated: Landslide, Winter Weather	$3,088,501.09
2017-02-14	2017-02-07	EM-3381-CA	Emergency	Potential Failure of the Emergency Spillway at Oroville Lake	Other, not an NRI hazard; not counted	no Public Assistance recorded
2017-02-14	2017-01-03	DR-4301-CA	Major disaster	Severe Winter Storms, Flooding, and Mudslides	Inland Flooding; Landslide; Winter Weather	$4,877,345.43
2008-07-08	2008-06-21	FM-2782-CA	Fire management	Camp Fire	Wildfire	no Public Assistance recorded		same incident as EM-3287
2008-06-28	2008-06-20	EM-3287-CA	Emergency	Wildfires	Wildfire	$1,390,219.80
2008-06-11	2008-06-11	FM-2771-CA	Fire management	Humboldt Fire	Wildfire	no Public Assistance recorded
2008-06-10	2008-06-10	FM-2770-CA	Fire management	Ophir Fire	Wildfire	no Public Assistance recorded
2006-02-03	2005-12-17	DR-1628-CA	Major disaster	Severe Storms, Flooding, Mudslides, and Landslides	Inland Flooding; Landslide	$848,258.24
2005-09-13	2005-08-29	EM-3248-CA	Emergency	Hurricane Katrina Evacuation	Hurricane: evacuation support, not a local hazard event; not counted	no Public Assistance recorded
2004-08-11	2004-08-11	FM-2545-CA	Fire management	Ca Oregon Fire 08-11-2004	Wildfire	no Public Assistance recorded
1999-09-01	1999-08-24	EM-3140-CA	Emergency	Ca-Wildfires-08/25/1999	Wildfire	$88,176.77
1998-02-09	1998-02-02	DR-1203-CA	Major disaster	Severe Winter Storms and Flooding	Inland Flooding; Winter Weather	no Public Assistance recorded
1997-01-04	1996-12-28	DR-1155-CA	Major disaster	Severe Storms, Flooding, Mud and Landslides	Inland Flooding; Landslide	no Public Assistance recorded
1995-03-12	1995-02-13	DR-1046-CA	Major disaster	Severe Winter Storms, Flooding Landslides, Mud Flow	Inland Flooding; Landslide; Winter Weather	no Public Assistance recorded
1995-01-10	1995-01-03	DR-1044-CA	Major disaster	Severe Winter Storms, Flooding, Landslides, Mud Flows	Inland Flooding; Landslide; Winter Weather	no Public Assistance recorded
1991-02-11	1990-12-19	DR-894-CA	Major disaster	Severe Freeze	Cold Wave	PA not declared for this county
1986-02-21	1986-02-12	DR-758-CA	Major disaster	Severe Storms & Flooding	Inland Flooding	no Public Assistance recorded
1983-02-09	1983-01-21	DR-677-CA	Major disaster	Coastal Storms, Floods, Slides & Tornadoes	Coastal Flooding; Inland Flooding; Landslide; Tornado	PA not declared for this county
1977-01-20	1977-01-20	EM-3023-CA	Emergency	Drought	Drought	no Public Assistance recorded
1970-02-16	1970-02-16	DR-283-CA	Major disaster	Severe Storms & Flooding	Inland Flooding	no Public Assistance recorded
1964-12-24	1964-12-24	DR-183-CA	Major disaster	Heavy Rains & Flooding	Inland Flooding	no Public Assistance recorded

School districts and special districts in this county: $67,779,389.47 (included in the county total above). Public Assistance matched by applicant name to the school districts and special districts FEMA lists as plan participants in this county. They have no row of their own in the jurisdiction table, so their total is listed here. These dollars are already included in the county PA column of the declarations table (the FEMA record places each applicant in this county), so this line is not added to it.

County Public Assistance: applicants the FEMA record places in this county, including any state agencies FEMA files there; statewide rows are listed on the state page; federal share obligated, nominal dollars.

Statewide declarations

Source: 2

Declared	Incident began	FEMA number	Type	Title	Mapped hazard
1964-04-01	1964-04-01	DR-169-CA	Major disaster	Seismic Sea Wave	Tsunami
1963-12-21	1963-12-21	DR-161-CA	Major disaster	Flood Due to Broken Dam	Other, not an NRI hazard; not counted
1963-02-25	1963-02-25	DR-145-CA	Major disaster	Severe Storms, Heavy Rains & Flooding	Inland Flooding
1962-10-24	1962-10-24	DR-138-CA	Major disaster	Severe Storms & Flooding	Inland Flooding
1962-03-06	1962-03-06	DR-122-CA	Major disaster	Floods	Inland Flooding
1961-11-16	1961-11-16	DR-119-CA	Major disaster	Fire (Los Angeles County)	Wildfire
1958-04-04	1958-04-04	DR-82-CA	Major disaster	Heavy Rainstorms & Flood	Inland Flooding
1956-12-29	1956-12-29	DR-65-CA	Major disaster	Forest Fire	Wildfire
1955-12-23	1955-12-23	DR-47-CA	Major disaster	Flood	Inland Flooding
1954-02-05	1954-02-05	DR-15-CA	Major disaster	Flood & Erosion	Inland Flooding

FEMA recorded these with designated area Statewide and no county, so they are listed on every county page in the state and not counted with county rows. Local data needed: whether each one affected this county.

5 Fire Management declarations (1977-08-07 to 1988-09-13) FEMA filed as Statewide with no county; each names one local fire. Listed on the state page.

Previous occurrences by hazard, with explicit no-event rows

Sources: 2, 6, 7

Hazard	Storm Events records, all years on file(years in the Period column)	Since plan approvalrecords	In the 12 months before plan approvalrecords	Last 5 yearsrecords	Declared incidents, all yearsseparate disasters	Period	Statement
Avalanche	0	0	0	0	0	1996 to 2026-06-30	No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events
Coastal Flooding	0	0	0	0	1	1996 to 2026-06-30	No Storm Events records of this type; 1 federal declared incident (see declarations table)
Cold Wave	15	0	1	4	1	1996 to 2026-06-30	Includes 6 Frost/Freeze records.
Drought	40	0	0	16	1	1996 to 2026-06-30
Earthquake	0	0	0	0	0		Storm Events does not record earthquakes; the USGS earthquake catalog is the source.
Hail	11	0	0	1	0	1955 to 2026-06-30
Heat Wave	31	1	2	11	0	1996 to 2026-06-30
Hurricane	0	0	0	0	0	1996 to 2026-06-30	No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events
Ice Storm	0	0	0	0	1	1996 to 2026-06-30	No Storm Events records of this type; 1 federal declared incident (see declarations table)
Inland Flooding	107	12	26	47	15	1996 to 2026-06-30
Landslide	5	0	0	0	11	1996 to 2026-06-30
Lightning	4	0	0	0	0	1996 to 2026-06-30
Strong Wind	62	2	4	11	1	1955 to 2026-06-30	Includes 38 High Wind and 12 Strong Wind records.
Tornado	18	0	0	1	2	1950 to 2026-06-30
Volcanic Activity	0	0	0	0	0	1996 to 2026-06-30	No recorded events, 1996 to 2026-06-30, NOAA NCEI Storm Events
Wildfire	32	0	4	5	11	1996 to 2026-06-30
Winter Weather	241	13	15	67	9	1996 to 2026-06-30

Notable Storm Events records

Sources: 1, 6, 7

Date	Event type	Magnitude or extent	Damagenominal dollars	Deaths, injuriesdirect only	Location	Flags	Why listed
2024-07-02	Excessive Heat		$0 property; $0 crops (zone total, 2024 dollars)	0, 0	NWS zone CAZ066 (NORTHEAST FOOTHILLS/SACRAMENTO VALLEY), zone-level	in the 12 months before plan approval; within last 5 years	B1-c worst recorded: Excessive Heat, Heat
2021-10-08	Drought		$0 property; $0 crops (zone total, 2021 dollars)	0, 0	NWS zone CAZ016 (CENTRAL SACRAMENTO VALLEY), zone-level	within last 5 years	B1-c worst recorded: Drought
2020-09-07	Wildfire		$0 property; $0 crops (zone total, 2020 dollars)	16, 0	NWS zone CAZ066 (NORTHEAST FOOTHILLS/SACRAMENTO VALLEY), zone-level		deaths or injuries recorded
2018-11-08	Wildfire		$17,000,000,000 property; $0 crops (zone total, 2018 dollars)	86, 12	NWS zone CAZ066 (NORTHEAST FOOTHILLS/SACRAMENTO VALLEY), zone-level		deaths or injuries recorded
2017-10-08	Wildfire		damage not reported	4, 0	NWS zone CAZ016 (CENTRAL SACRAMENTO VALLEY), zone-level		deaths or injuries recorded
2017-02-12	Flood		$549,000,000 property; $0 crops (2017 dollars)	0, 0	HONCUT to LAND		B1-c worst recorded: Flash Flood, Flood, Lakeshore Flood
2017-01-09	Debris Flow		$4,260,000 property; $0 crops (2017 dollars)	0, 0	PULGA		B1-c worst recorded: Debris Flow
2016-10-02	Hail	1 in	damage not reported	0, 0	CHICO		B1-c worst recorded: Hail
2007-06-05	Lightning		$80,000 property; $0 crops (2007 dollars)	0, 0	(CIC)CHICO MUNI ARPT		B1-c worst recorded: Lightning
1996-01-01	High Wind	87 kt (100 mph), measurement type not recorded	damage not reported	0, 0	NWS zone CAZ016 (CENTRAL SACRAMENTO VALLEY), zone-level		B1-c worst recorded: High Wind and Strong Wind
1994-02-10	Tornado	F2, 0.3 mi path length (whole path, pre-1996), 20 yd wide	$5,000,000 property; crops not recorded (1994 dollars)	0, 2	Oroville		B1-c worst recorded: Tornado
1978-06-15	Thunderstorm Wind	78 kt (90 mph), measurement type not recorded	damage not recorded (pre-1996 record)	0, 0	location not recorded		B1-c worst recorded: Thunderstorm Wind

The full list is in the Excel file, sheet "B1-d Storm Events history" (566 rows).

Location is the place NOAA recorded, as written in its data; it need not be a jurisdiction in this plan.

Local data needed: state-declared emergencies, from your state emergency management agency (federal data do not include them).

Tribal and special-area declarations in this state are listed on the state page.

Supports FEMA checklist item B1-e: probability of future events

Probability: FEMA annualized frequency and descriptor per hazard

Sources: 5, 6

Hazard	FEMA annualized frequency (modeled)unit per row	Unit	In plain terms	Descriptor	Descriptor basis	NRI events or days in its record period (hail, wind and tornado are area-weighted, so can be fractional)	NRI period	Location	Note
Avalanche	0.01	events per year	about 1 in 100 years	Possible	FEMA annualized frequency (modeled)	0	1994 to 2023 (30 years)	see B1-f	0.01 is NRI's minimum avalanche frequency for a county in an avalanche susceptibility zone; NRI records no avalanche here, so the descriptor reflects the floor, not local events.
Coastal Flooding		events per year at a location (modeled)				not shown	modeled	see B1-f	Not Applicable in NRI for this county; no descriptor.
Cold Wave	0	event-days per year	none modeled	Likely	Storm Events event-days in 4 of 30 years, 1996 to 2025 (13.3%)	0	2005-11-12 to 2024-11-12 (19 years)	countywide	NRI models no cold wave event-days here (2005-11-12 to 2024-11-12, 19 years); Storm Events has a record in 4 of 30 years. The descriptor comes from Storm Events, which records events NRI's definition leaves out.
Drought	66.6	event-days per year	about 66.6 days per year	Likely	Storm Events event-days in 6 of 30 years, 1996 to 2025 (20%)	2,303	2000 to 2025 (25.25 years; D3 and D4 only)	countywide
Earthquake	0.0407	annual probability at a location	chance a given location in the county has at least minor-damage shaking in a year: 4.07%			not shown	modeled	see B1-f	No descriptor (Storm Events does not record earthquakes).
Hail	0.115	events per year	about 1 in 9 years	Likely	FEMA annualized frequency (modeled)	4.4 (modeled)	1986 to 2023 (38 years)	countywide
Heat Wave	6.93	event-days per year	about 6.93 days per year	Likely	Storm Events event-days in 9 of 30 years, 1996 to 2025 (30%)	79.6	2005-11-12 to 2024-11-12 (19 years)	countywide
Hurricane		events per year					1851 to 2024 (Atlantic); 1949 to 2024 (Pacific)	see B1-f	Not Applicable in NRI for this county; no descriptor.
Ice Storm		event-days per year					1946-12-31 to 2014-02-12 (67 years)	countywide	Not Applicable in NRI for this county; no descriptor.
Inland Flooding	1.36	event-days per year	about 1.36 days per year	Likely	Storm Events event-days in 14 of 30 years, 1996 to 2025 (46.7%)	38	1996 to 2023 (28 years)	see B1-f
Landslide	21	events per year (modeled)	about 21 per year	Highly likely	FEMA annualized frequency (modeled)	not shown	modeled	see B1-f
Lightning	11.9	days per year with a strike	about 11.9 days per year	Highly likely	FEMA annualized frequency (modeled)	not shown	1995 to 2023 (29 years; CONUS)	countywide
Strong Wind	0.0157	events per year	about 1 in 64 years	Possible	FEMA annualized frequency (modeled)	1	1986 to 2023 (38 years)	countywide
Tornado	0.147	events per year	about 1 in 7 years	Likely	FEMA annualized frequency (modeled)	not shown	1950 to 2023 (EF2+); 1986 to 2023 (EF0-1)	see B1-f
Volcanic Activity	0.0011	annual probability	about 1 in 909 years	Unlikely	FEMA annualized frequency (modeled)	not shown	modeled	see B1-f
Wildfire	0.005	annual probability at a location	chance a given location in the county burns in a year: 0.5%	Likely	Storm Events records in 11 of 30 years, 1996 to 2025 (36.7%)	not shown	modeled	see B1-f
Winter Weather	10.9	event-days per year	about 10.9 days per year	Highly likely	Storm Events event-days in 27 of 30 years, 1996 to 2025 (90%)	205	2005-11-12 to 2024-11-12 (19 years)	countywide

FEMA annualized frequency (modeled) is the National Risk Index v1.20 (December 2025) estimate of how often a hazard affects this county in a year; it is not recorded events divided by years, and its unit differs by hazard (events, event-days, or days with a lightning strike per year). For earthquake, wildfire, coastal flooding and tsunami the value is the chance (or number of events) at a location in the county, not across the county, so no "1 in N years" is given and the descriptor comes from Storm Events where it has a record (none for earthquake). The Methods page gives each hazard's method, from FEMA's National Risk Index Technical Documentation v1.20.

Where NRI gives event-days, the descriptor comes from the share of years with a Storm Events record; NRI's source records more events, so the two differ.

Descriptor scale used in this packet (defined per unit)

Sources: 5, 6

Unit	Descriptor	Definition
events per year	Highly likely	1 or more per year
events per year	Likely	about once in 1 to 10 years
events per year	Possible	about once in 10 to 100 years
events per year	Unlikely	less than once in 100 years
annual probability	Likely	10% to under 100% chance in a given year
annual probability	Possible	1% to under 10% chance in a given year
annual probability	Unlikely	under 1% chance in a given year
event-days (share of years)	Highly likely	event-days recorded in 90% or more of years
event-days (share of years)	Likely	event-days recorded in 10% to under 90% of years
event-days (share of years)	Possible	event-days recorded in some years but under 10% of years
lightning strike-days	Highly likely	cloud-to-ground strikes on 1 or more days per year

Intensity bands: historical frequency (Storm Events)

Source: 6

Hazard	Band	Years	Eventscounty-coded records	Years in period	Events per yearevents / years
Hail	1.00-1.99 in	1996 to 2025	6	30	0.2
Hail	2.00 in+	1996 to 2025	0	30	0
Thunderstorm Wind (counted as NRI Strong Wind)	50-64 kt	1996 to 2025	4	30	0.133
Thunderstorm Wind (counted as NRI Strong Wind)	65 kt+	1996 to 2025	0	30	0
Thunderstorm Wind (counted as NRI Strong Wind)	unmeasured or below 50 kt	1996 to 2025	4	30	0.133
Tornado	EF0-1	1996 to 2025	7	30	0.233
Tornado	EF2-3	1996 to 2025	1	30	0.0333
Tornado	EF4-5	1996 to 2025	0	30	0
Tornado	unrated (EFU)	1996 to 2025	0	30	0

The bands show how often events of each severity were recorded in this county, to profile how severe events have been (FEMA's probability item asks for the range of intensities).

Hail smaller than 1 inch is not counted: on 2010-01-05 the National Weather Service raised its severe-hail threshold from 3/4 inch to 1 inch, so smaller reports became less common after 2009 (NWS Service Change Notice 09-52). NRI hail frequency uses a 0.75 inch threshold.

Optional: future conditions. Not a required item in the 2025 FEMA Local Mitigation Planning Policy Guide; some states ask for it. The federal Climate Mapping for Resilience and Adaptation (CMRA) site gives county exposure to future climate conditions (https://resilience.climate.gov/).

Supports FEMA checklist item B1-f: hazards that vary across jurisdictions

Range of census tract risk within the county

Source: 5

Hazard	Tractsrated of all	NRI risk score, 0 to 100			Tracts by rating
Hazard	Tractsrated of all	Min	Median	Max	Tracts by rating
Avalanche	11 of 54	12.2	15.0	16.7	Very Low 11, Not Applicable 43
Coastal Flooding	0 of 54				Not Applicable 54
Cold Wave	0 of 54				No Rating 54
Drought	31 of 54	67.3	90.9	100.0	Very High 5, Relatively High 3, Relatively Moderate 6, Relatively Low 14, Very Low 3, No Rating 23
Earthquake	54 of 54	71.2	85.5	98.9	Very High 1, Relatively High 14, Relatively Moderate 32, Relatively Low 7
Hail	54 of 54	17.4	31.2	50.4	Relatively Low 9, Very Low 45
Heat Wave	54 of 54	8.5	40.8	60.0	Relatively Moderate 6, Relatively Low 42, Very Low 6
Hurricane	0 of 54				Not Applicable 54
Ice Storm	0 of 54				Not Applicable 54
Inland Flooding	54 of 54	7.6	61.9	99.1	Very High 2, Relatively High 15, Relatively Moderate 21, Relatively Low 12, Very Low 4
Landslide	52 of 54	12.6	50.3	99.8	Relatively High 2, Relatively Moderate 8, Relatively Low 5, Very Low 37, No Rating 2
Lightning	54 of 54	14.2	39.9	58.9	Relatively Moderate 11, Relatively Low 38, Very Low 5
Strong Wind	54 of 54	5.8	11.6	32.7	Relatively Low 3, Very Low 51
Tornado	54 of 54	5.2	18.0	31.1	Relatively Low 3, Very Low 51
Volcanic Activity	54 of 54	52.4	81.8	86.3	Very Low 54
Wildfire	45 of 54	43.3	95.5	99.8	Very High 5, Relatively High 16, Relatively Moderate 12, Relatively Low 9, Very Low 3, No Rating 9
Winter Weather	54 of 54	15.2	17.3	60.9	Relatively Moderate 3, Relatively Low 15, Very Low 36

Drought: Agriculture is all of NRI's expected annual loss for this hazard in the county, so the tract range mostly reflects where crop and livestock value is.

Rated tracts only: No Rating (score 0.0), Not Applicable and Insufficient Data tracts are counted but not used for the minimum, median and maximum.

The score ranks a tract against all U.S. tracts (100 = highest). The rating is FEMA's category for the tract's risk value, computed differently, so the two can disagree.

Frequency data for drought, hail, heat wave, lightning, strong wind and winter weather are county-wide or coarse (49 km grid or NWS zone), the same for every jurisdiction; the tract range mostly reflects where buildings and people are (crop and livestock value where a line above names agriculture).

Each jurisdiction (starting figures from federal data)

Sources: 1, 3, 4, 6

Jurisdiction	Type	Plan status	Repetitive lossFMA RL and SRL (44 CFR 77.2); repeat-flood, any definition	Public Assistance to this jurisdictionFEMA records matched by applicant name; federal share obligated, nominal dollars	Event records naming this placeall years; since its plan	Notes
Butte County	County	Approved, expires 2030-02-03	FMA RL 1, SRL 6; any 34	$56,024,106.75	0 total; 0 since its plan	Includes $4,518,816.87 for declarations not counted as hazard incidents (DR-4482-CA).
Biggs city	City	Approved, expires 2030-02-03	FMA RL 0, SRL 0; any 0	no Public Assistance recorded	5 total; 0 since its plan
Chico city	City	Approved, expires 2030-02-03	FMA RL 0, SRL 0; any 2	$119,763.27	14 total; 1 since its plan
Gridley city	City	Approved, expires 2030-02-03	FMA RL 0, SRL 0; any 0	$261,450.29	1 total; 0 since its plan
Oroville city	City	Approved, expires 2030-02-03	FMA RL 0, SRL 0; any 2	$601,887.32	10 total; 0 since its plan
Paradise town	Town	Approved, expires 2030-02-03	FMA RL 0, SRL 0; any 0	$33,074,313.70	4 total; 0 since its plan

Repetitive-loss counts are for whole NFIP communities, which can extend beyond this county (see the note in B2-c).

School districts and special districts get a plan clock row only.

County Public Assistance in B1-d also includes applicants filed under the county that are not jurisdictions in this plan (for example state agencies, special districts and nonprofits), so the jurisdiction rows add up to less.

Supports FEMA checklist items B2-a and B2-b: vulnerability and potential impacts

Local data needed

The table below gives county-level starting figures; the plan describes impacts for each jurisdiction and its own assets.

Critical facilities and lifelines per hazard
A problem statement per jurisdiction per hazard
Changes in development in hazard-prone areas since the last approval, or a statement of none (E1-a)
Future assets

County-level starter: exposure, expected annual loss and damage since the plan

Sources: 1, 2, 3, 5, 6, 7

Hazard	Building exposuremodeled dollars	Agriculture exposuremodeled dollars	Population exposedpeople	EAL buildingsmodeled dollars per year	EAL agriculturemodeled dollars per year	Cost of expected deaths and injuriesFEMA's dollar value per year, not property damage	EAL as % of exposurebuildings; agriculture where noted	Storm Events damage since 2025-02-04county-coded records, property plus crops, nominal dollars	Zone-level damage since planproperty plus crops, reported for the zone	Note
Avalanche	$4,737,743	n/a	under 1	$5	n/a	$71	0.000105%
Coastal Flooding										Not Applicable in NRI for this county
Cold Wave	$0	$0	0	$0	$0	$0				building exposure is 0 in NRI
Drought	n/a	$619,028,584	n/a	n/a	$26,485,232	n/a	4.28% (agriculture)			NRI has no building exposure for this hazard; agriculture shown
Earthquake	$83,793,380,076	n/a	211,632	$25,015,698	n/a	$8,527,006	0.0299%
Hail	$47,725,797,603	$674,881,121	211,490	$84,708	$10,341	$25,926	0.000177%
Heat Wave	$47,725,797,603	$674,881,121	211,490	$1,452	$2,462	$1,427,719	under 0.0001%		$0
Hurricane										Not Applicable in NRI for this county
Ice Storm										Not Applicable in NRI for this county
Inland Flooding	$47,706,138,326	$338,804,986	11,998	$48,181,841	$47,331	$6,462	n/a (see note)	$0		NRI counts the full building value of any census block with some flood loss; this is not the value of buildings in the floodplain. Use local FIRM overlays for B2-a/B2-b.
Landslide	$1,058,799,870	n/a	4,798	$208,095	n/a	$179,550	0.0197%
Lightning	$47,725,797,603	n/a	211,490	$20,496	n/a	$379,519	under 0.0001%
Strong Wind	$47,725,797,603	$674,881,121	211,490	$13,843	$15,796	$50,899	under 0.0001%		$10,000	Storm Events damage since the plan includes 2 zone-level High Wind records ($10,000): a NOAA non-thunderstorm wind type, outside NRI's Strong Wind definition.
Tornado	$47,725,797,603	$674,881,121	211,490	$289,233	$1,385	$98,455	0.000606%
Volcanic Activity	$47,725,797,603	n/a	211,490	$1	n/a	$391	under 0.0001%
Wildfire	$6,723,251,998	$158,285,852	44,693	$15,181,433	$1,794	$891,763	0.226%
Winter Weather	$47,725,797,603	$674,881,121	211,490	$522	under $1	$20,531	under 0.0001%		$100,000

Totals since 2025-02-04 (Storm Events through 2026-06-30): 12 county-coded records, 12 with a damage value recorded (including $0), $0; 16 zone-level records, 16 with a damage value recorded (including $0), $110,000 reported for the zone; Public Assistance: no counted declaration since the plan.

FEMA does not split Public Assistance by hazard. A declaration mapped to several hazards is listed under each of them with its full amount, so the per-hazard column does not add up to the total; the unit total counts each declaration once.

NRI computes earthquake exposure on its own basis, so it exceeds the county building value in B2-a.

Supports FEMA checklist item B2-a: vulnerability (county context)

County context

Source: 5

Measure	Value
Population	211,490
Building value (total, not at risk)	$47,725,797,603
Agriculture value (total, not at risk)	$674,881,121
NRI risk rating (all hazards)	Relatively Moderate
Expected annual loss, buildings and agriculture, all hazards	$115,561,670
Expected annual loss, population equivalence, all hazards (NRI values each statistical life at $13.7M; a modeled value of expected deaths and injuries, not property damage)	$11,608,292
Social vulnerability rating	Relatively Moderate
Community resilience rating	Relatively High
NRI version	December 2025

FEMA's all-hazard expected annual loss adds buildings, agriculture and population equivalence; this table gives the property part and the population-equivalence part as separate rows.

Social vulnerability: higher means people are more likely to be harmed and slower to recover. Community resilience: lower means the community is less able to recover. High social vulnerability and low resilience both raise the NRI risk rating.

Supports FEMA checklist item B2-c: repetitive loss properties

Repetitive loss in this county, both definitions

Sources: 1, 4

Definition	Properties	Severe repetitive loss	Properties
Repetitive loss, FMA definition (44 CFR 77.2)	1	Severe repetitive loss, FMA definition (44 CFR 77.2)	6
Repetitive loss, NFIP insurance definition	38	Severe repetitive loss, NFIP insurance definition	6

The state NFIP coordinator's list, the source FEMA's Handbook names, often uses the NFIP insurance definition (second row).

Repeat-flood properties: county and state-level rows

Sources: 1, 4

Scope	RL, FMAproperties	SRL, FMAproperties	RL, NFIPproperties	SRL, NFIPproperties	Any categoryproperties	Mitigatedproperties	Currently insuredproperties
County total	1	6	38	6	38	0	13
of which: Butte County (unincorporated area)	1	6	34	6	34	0	12
of which: Oroville city	0	0	2	0	2	0	1
of which: Chico city	0	0	2	0	2	0	0
Statewide, no county in FEMA's file	0	1	3	0	4	1	0

The statewide row counts properties FEMA's file gives with no county in this state; they are listed for reference and are not in this county's counts.

Repeat-flood properties by jurisdiction in the plan (NFIP community)

Sources: 1, 4

Jurisdiction	NFIP community ID	RL, FMAproperties	SRL, FMAproperties	RL, NFIPproperties	SRL, NFIPproperties	Any categoryproperties	Currently insuredproperties
Butte County	060017	1	6	34	6	34	12
Biggs city	060437	0	0	0	0	0	0
Chico city	060746	0	0	2	0	2	0
Gridley city	060019	0	0	0	0	0	0
Oroville city	060020	0	0	2	0	2	1
Paradise town	060748	0	0	0	0	0	0

Counts by occupancy group for each jurisdiction are in the Excel file, sheet "B2-c Jurisdictions".

Jurisdiction rows are whole NFIP communities and need not add up to the county total: a community that extends into another county is counted in full on each jurisdiction row, while the county table counts only its part in this county.

County repeat-flood properties by occupancy group

Sources: 1, 4

Occupancy group	RL, FMAproperties	SRL, FMAproperties	RL, NFIPproperties	SRL, NFIPproperties	Any categoryproperties	Currently insuredproperties
single-family residential	1	6	37	6	37	12
2 to 4 unit residential	0	0	0	0	0	0
other residential	0	0	0	0	0	0
non-residential	0	0	1	0	1	1
not reported	0	0	0	0	0	0

FEMA's occupancy groups have no institutional class; institutional properties are counted in non-residential or other residential in the table by occupancy group.

FMA RL and FMA SRL are the Flood Mitigation Assistance definitions (44 CFR 77.2), the ones the FEMA Local Mitigation Planning Policy Guide cites. NFIP repetitive loss (the FEMA insurance definition) is 2 or more claims over $1,000 in 10 years, and a property can leave that group once it is mitigated. Also shown: NFIP severe repetitive loss, any category, mitigated and currently insured. The Methods page gives the OpenFEMA field details.

Counts are aggregates of FEMA's public NFIP Multiple Loss Properties file (FEMA's data date 2026-08-02; file version 2026-08-04). No property is identified. County assignment is FEMA's geocode.

In this county 0 properties are FMA repetitive loss but not NFIP repetitive loss, and 37 properties are NFIP repetitive loss but not FMA repetitive loss.

Exact counts; no count suppression.

Sources

Tables cite these sources by number. The full list, for the plan's bibliography (FEMA review item A4-a):

FEMA, OpenFEMA HazardMitigationPlanStatuses v1, version 2026-09-29T134039Z, pulled 2026-09-30, https://www.fema.gov/api/open/v1/HazardMitigationPlanStatuses (API)
FEMA, OpenFEMA DisasterDeclarationsSummaries v2, version 2026-09-29T162832Z, pulled 2026-09-30, https://www.fema.gov/api/open/v2/DisasterDeclarationsSummaries (API)
FEMA, OpenFEMA PublicAssistanceFundedProjectsSummaries v1, version 2026-09-29T150754Z, pulled 2026-09-30, https://www.fema.gov/api/open/v1/PublicAssistanceFundedProjectsSummaries (API)
FEMA, OpenFEMA NfipMultipleLossProperties v1, version 2026-08-04T164045Z, pulled 2026-09-30, https://www.fema.gov/api/open/v1/NfipMultipleLossProperties (API)
FEMA, FEMA National Risk Index 1.20.0 (December 2025), county and census tract tables, version 1.20.0, pulled 2026-09-30, https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_Counties.zip (download, 25 MB), https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_CensusTracts.zip (download, 635 MB)
NOAA NCEI, NOAA NCEI Storm Events Database, details files (csvfiles v1.0), version c20260918, pulled 2026-09-30, https://www.ncei.noaa.gov/pub/data/swdi/stormevents/csvfiles/
NOAA National Weather Service, NWS county-public forecast zones correlation file, version bp03mr20 to bp16ap26 (11 files; newest bp16ap26), pulled 2026-09-30, https://www.weather.gov/gis/ZoneCounty
U.S. Census Bureau, Census 2024 Gazetteer, 2020 place by county, CT county-to-cousub crosswalk, version 2024-gazetteer, pulled 2026-09-30, https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/2024_Gaz_counties_national.zip, https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/2024_Gaz_cousubs_national.zip, https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/2024_Gaz_place_national.zip, https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/2024_Gaz_unsd_national.zip, https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/2024_Gaz_elsd_national.zip, https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2024_Gazetteer/2024_Gaz_scsd_national.zip, https://www2.census.gov/geo/docs/reference/codes2020/national_place_by_county2020.txt, https://www2.census.gov/geo/docs/reference/ct_change/ct_cou_to_cousub_crosswalk.xlsx (used to match place names and codes; no table prints its values)

What this packet is and what the plan adds

This packet is the federal data for the plan's risk assessment (the summary on page 1 says how it is organized); the plan and FEMA's review decide whether each item is met.

The plan adds what only the community has: local data on assets, critical facilities, development and each jurisdiction's impacts; local hazard history, including state-declared emergencies; the mitigation strategy; and adoption.

How the federal data are built: National Risk Index values are FEMA's model, not counts of events. Storm Events is more complete from 1996; zone-level records are placed by forecast zone, not by location in the county. Public Assistance for a jurisdiction is matched by applicant name. The Methods page gives every rule and the known edge cases.

OpenFEMA disclaimer

This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).

Reuse, citation and corrections

Reuse and citation: Hazard Plain text and tables are licensed under Creative Commons Attribution 4.0 International (CC BY 4.0, https://creativecommons.org/licenses/by/4.0/); credit Hazard Plain and the release. The underlying federal data are public domain; OpenFEMA data are also subject to the OpenFEMA terms and conditions.

Cite this: Hazard Plain (2026). Butte County, CA: risk-assessment baseline packet, release 2026-10 (data as of 2026-09-30; County FIPS 06007). Automated baseline. https://hazardplain.org/ca/06007/ Built from FEMA OpenFEMA, the FEMA National Risk Index and NOAA NCEI Storm Events; source versions in the packet's Sources list.

Corrections: to report an error, name the packet, the table and what your records show. Contact: [email protected]