San Francisco, CA Environmental Rules: Flood Elevation Requirements (2026)

All new construction and substantial improvements shall be designed and constructed in accordance with the requirements of San Francisco Building Code Section 1612, California Building Code Section 1612, or other comparable code requirements applicable to the City agency or department implementing the standards of construction under this Article XX, as any of the foregoing code requirements may be amended from time to time.

(2)   Standards for Subdivisions. If a subdivision proposal is in a flood-prone area, any such proposals shall be reviewed to assure that:

(A)   All such proposals are consistent with the need to minimize flood damage within the flood prone area;

(B)   All public utilities and facilities such as sewer, gas, electrical, and water systems are located and constructed to minimize or eliminate flood damage; and

(C)   Adequate drainage is provided to reduce exposure to flood hazards.

(3)   Standards For Utilities. All new and replacement water supply and sanitary sewage systems shall be designed to minimize or eliminate:

(A)   Infiltration of flood waters into the systems, and

(B)   Discharge from the systems into floodwaters.

(4)   Manufactured Homes. All manufactured homes that are placed or substantially improved, on sites located in a new manufactured home park or subdivision within Zones A1-30, AH, and AE on the community’s Flood Insurance