Environmental Rules in Castro Valley, CA (2026)
5 verified environmental rules for Castro Valley, California, sourced directly from the municipal code and official government pages.
Verified from official government sources
Stormwater Management
Castro Valley is in the Alameda Countywide Clean Water Program (ACCWP) NPDES permit area. Only rain goes in the storm drain - no washing pollutants, sediment, soaps, or yard waste into gutters.
Castro Valley Stormwater & NPDES Rules
Some RestrictionsFlood Zones
Castro Valley has limited FEMA Special Flood Hazard Areas (SFHA) along San Lorenzo, Crow and Cull Creeks. Properties in Zone AE require flood insurance for federally backed mortgages and elevation above the Base Flood Elevation (BFE) for new construction.
Castro Valley FEMA Flood Zone Rules
Some RestrictionsLooking for Alameda County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Castro Valley city rules.
Environmental Rules in Alameda County →