Hazard Plain national table nri_county_hazard, release 2026-10 (as of 2026-09-30)
B1-a, B1-e and B2 starter NRI values per county area and hazard (18 hazards), with FREQ descriptors.
Files: nri_county_hazard.csv and nri_county_hazard.parquet (58,176 rows). The Parquet file carries this text as key-value metadata (keys hazard_plain.*).

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Columns: stcofips, prefix, hazard, applicable, risk_rating, risk_score, eal_rating, eal_total, eal_b, eal_a, eal_pe, eal_pe_share, exp_total, exp_b, exp_pe, exp_a, eal_pct_buildings, eal_pct_agriculture, afreq, afreq_label, afreq_unit, afreq_unit_label, afreq_scope, one_in_n, days_per_year, descriptor, descriptor_metric, descriptor_gap, share_years_with_event_day, evnts, period_label, rank_eal, se_events_since_1996, n_years_with_event_day, share_period, se_through_date, se_partial_note

Sources:
  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, https://www.fema.gov/about/reports-and-data/openfema/nri/v120/NRI_Table_CensusTracts.zip
  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/

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).