Yuba County, CA Environmental Rules: Flood Zones (2026)

30 applies only inside unincorporated Yuba County; Marysville and Wheatland enforce their own floodplain rules. 060, the applicant must obtain a development permit from the Community Development and Services Agency, whose Director serves as Floodplain Administrator. 070(c) lists the minimum application contents: duplicate scaled plans showing the location, dimensions and elevation of existing or proposed structures; proposed water supply, sewer, and utility locations; grading and drainage information; the location of any regulatory floodway; base flood elevation data; and the proposed elevation of the lowest floor, including any basement, in relation to mean sea level.

Nonresidential structures seeking floodproofing instead of elevation must submit a registered civil engineer or architect certification. 070(b), the Floodplain Administrator also verifies that state and federal permits are in hand, confirms the site is reasonably safe from flooding, checks that the project will not raise the base flood elevation more than one foot anywhere in the county, and forwards Letters of Map Revision to FEMA before any building permit issues; Conditional LOMRs alone are not enough to authorize a building permit. 070(d) sends the appeal to the Yuba County Board of Supervisors, which hears and decides the dispute. 090.