Hazard Plain national table what_changed, release 2026-10 (as of 2026-09-30)
The page 1 box: what changed since the last plan, per unit.
Files: what_changed.csv and what_changed.parquet (3,488 rows). The Parquet file carries this text as key-value metadata (keys hazard_plain.*).

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Columns: unit_id, unit_type, stcofips, approval_date, as_of, new_declarations, n_new_declaration_rows, n_new_incidents_counted, n_storm_records_since_plan, prior_release, rl_any_category_prior, rl_any_category_now, rl_change, rl_note, n_changes_since_prior_release

Sources:
  FEMA, OpenFEMA HazardMitigationPlanStatuses v1, version 2026-09-29T134039Z, pulled 2026-09-30, https://www.fema.gov/api/open/v1/HazardMitigationPlanStatuses
  FEMA, OpenFEMA DisasterDeclarationsSummaries v2, version 2026-09-29T162832Z, pulled 2026-09-30, https://www.fema.gov/api/open/v2/DisasterDeclarationsSummaries
  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/
  FEMA, OpenFEMA NfipMultipleLossProperties v1, version 2026-08-04T164045Z, pulled 2026-09-30, https://www.fema.gov/api/open/v1/NfipMultipleLossProperties

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).