Redondo Beach, CA Environmental Rules: Flood Zones (2026)

Redondo Beach's Flood Damage Prevention chapter, RBMC Chapter 12 of Title 9, applies to all areas of special flood hazard within the city, defined by reference to the Flood Insurance Study and accompanying Flood Insurance Rate Map on file at the Department of Engineering and Building Services at 415 Diamond Street. 403 requires the applicant to first obtain a development permit from the City on City-furnished forms. The application must include duplicate scaled plans showing the location, dimensions, and elevation of the site and any existing or proposed structures; proposed water supply, sanitary sewer, and utility locations; grading information with existing and proposed contours and drainage facilities; the location of the regulatory floodway when applicable; base flood elevation data; the proposed elevation of the lowest floor of all structures relative to mean sea level; and, for nonresidential buildings, the elevation to which the structure will be floodproofed.

Nonresidential floodproofing must be certified by a registered civil engineer or architect, and crawl-space foundations must show the location and net area of required flood openings. 404. Development is defined broadly to include any man-made change to real estate, including buildings, mining, dredging, filling, grading, paving, excavation, or storage of equipment or materials, so the permit trigger is not limited to new buildings.