California Statewide Rule

California Floodplain Management Standards Apply Statewide

Some RestrictionsApplies statewide across California (2026)

Key Facts

General plan mandate: Gov Code 65302
Building standard: CBC Chapter 16
Central Valley rule: Gov Code 65865.5
Disclosure law: Civil Code 1103
Federal program: 44 CFR 59 NFIP

Last verified: September 5, 2026Source: California Government Code 65302

Summary

Government Code sections 65302 and 65962, together with Water Code section 8401 and the State Building Code Chapter 16, set uniform floodplain mapping, disclosure, and construction standards binding every California jurisdiction.

The safety element, upon the next revision of the housing element on or after January 1, 2009, shall also do the following: (A) Identify information regarding flood hazards, including, but not limited to, the following: (i) Flood hazard zones. As used in this subdivision, "flood hazard zone" means an area subject to flooding that is delineated as either a special hazard area or an area of moderate or minimal hazard on an official flood insurance rate map issued by FEMA. The identification of a flood hazard zone does not imply that areas outside the flood hazard zones or uses permitted within flood hazard zones will be free from flooding or flood damage.

Source: California Government Code 65302View official code

Full Breakdown

Government Code 65302(g) requires every city and county general plan safety element to address flood hazards using FEMA and DWR mapping. Government Code 65860 requires zoning consistency with general plans. Water Code 8401 enforces Central Valley flood protection plans. The California Building Standards Code (Title 24) Chapter 16 incorporates ASCE 24 flood-resistant construction standards for FEMA Special Flood Hazard Areas. Civil Code 1103 mandates seller disclosure of flood hazard zones. Senate Bill 5 prohibits local approval of new urban development in unprotected Sacramento-San Joaquin Valley floodplains under Government Code 65865.5.

Violations & Penalties

Local agencies that fail to enforce floodplain standards risk loss of FEMA flood insurance program participation under 44 CFR 59. Property owners who build without proper elevation face stop-work orders, demolition, and denial of federal disaster assistance.

Frequently Asked Questions

Can a California city allow building below FEMA elevations?

No. The California Building Code adopts statewide minimum elevation and flood-resistant construction standards. Local floodplain management ordinances must meet or exceed these and FEMA NFIP requirements.

What happens if a city does not comply?

FEMA can suspend the city from the National Flood Insurance Program, eliminating federally backed mortgages and disaster aid. The state may also require general plan corrections under Government Code 65585.

Sources

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