Manteca, CA Environmental Rules: Flood Elevation Requirements (2026)

Residential construction, new or substantial improvement, shall have the lowest floor, including basement:

a. In an AO zone, elevated above the highest adjacent grade to a height equal to or exceeding the depth number specified in feet on the FIRM, or elevated at least two feet above the highest adjacent grade if no depth number is specified.

b. In an A zone, elevated to or above the base flood elevation; said base flood elevation shall be determined by one of the methods in Section 8.30.150(B) of this chapter.

c. In all other zones, elevated to or above the base flood elevation. Upon the completion of the structure, the elevation of the lowest floor including basement shall be certified by a registered professional engineer or surveyor, and verified by the community building inspector to be properly elevated. Such certification and verification shall be provided to the flood-plain administrator.

2. Nonresidential construction, new or substantial improvement, shall either be elevated to conform with Section 8.30.170(C)(1) or together with attendant utility and sanitary facilities:

a. Be floodproofed below the elevation recommended under Section 8.30.170(C)(1) so that the structure is watertight with walls substantially impermeable to the passage of water;

b. Have structural components capable of resisting hydrostatic and hydrodynamic loads and effects of buoyancy; and

c.