Stockton, CA Environmental Rules: Flood Elevation Requirements (2026)
Key Facts
- Freeboard
- 2 feet above base flood elevation (AE/AH/A1-30)
- AO zones
- 2 ft above depth number, or 4 ft above grade
- BFE definition
- 1%-annual-chance water surface, SMC § 15.44.040
- Certification
- Registered civil engineer or licensed surveyor required
- Nonresidential option
- Floodproofing allowed instead of elevating
Summary
Stockton requires new and substantially improved homes in AE, AH, and A1-30 flood zones to elevate the lowest floor and all mechanical equipment at least two feet above base flood elevation, a two-foot freeboard margin set in Stockton Municipal Code Section 15.44.150. Base flood elevation is the water surface produced by a flood with a 1% annual chance of occurring, per FEMA's mapping.
C. Elevation and Floodproofing. 1. Residential Construction. All new construction or substantial improvements of residential structures shall have the lowest floor, including basement, and all machinery and equipment servicing the building: a. In AE, AH, A1-30 Zones, elevated at least two feet above the base flood elevation; b. In an AO zone, elevated above the highest adjacent grade to a height two feet above the depth number specified in feet on the FIRM, or elevated at least four feet above the highest adjacent grade if no depth number is specified; c. In an A zone, without BFEs specified on the FIRM [unnumbered A zone], elevated at least two feet above the base flood elevation; as determined under Section 15.44.120(C).
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: rev 4970744; v11 updated 2026-07-07).
Full Breakdown
040 defines 'base flood elevation (BFE)' as the elevation shown on the Flood Insurance Rate Map for Zones AE, AH, A1-30, VE, and V1-V30, marking the water surface of a flood with a 1% or greater chance of being equaled or exceeded in a given year. 120(C). A registered civil engineer or licensed land surveyor must certify the as-built lowest floor elevation, and the community building inspector must verify it, before the certification goes to the Floodplain Administrator. 150(C)(2). 150(C)(3).
Violations & Fines
A structure built below the required freeboard, or without the elevation or floodproofing certification Section 15.44.120(E) requires, violates Stockton Municipal Code Chapter 15.44 and is a misdemeanor under Section 15.44.070; the City may take any lawful action needed to remedy the violation, and the Floodplain Administrator can withhold final sign-off until a registered engineer's or surveyor's elevation certificate is filed.
Frequently Asked Questions
How high above base flood elevation must a new Stockton home sit?
Who certifies that a Stockton building meets the flood elevation requirement?
Can a Stockton business floodproof a building instead of raising it?
Sources & Official References
Other rules in Stockton
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Flood Elevation Requirements in Nearby Cities
How other cities in San Joaquin County handle flood elevation requirements.