5 county-level rules, plus city-specific rules for 4 cities in San Joaquin County, California.
Verified from official government sources
San Joaquin County operates under a Phase II MS4 NPDES permit from the Central Valley Regional Water Board. Construction disturbing 1+ acre needs a SWPPP and coverage under the CGP. Priority Development Projects creating 2,500+ sq ft of impervious area need post-construction stormwater treatment. Illicit discharge to storm drains and Delta sloughs is strictly prohibited.
Erosion and sediment control is required on all grading and construction sites in San Joaquin County. Grading permits include an erosion control plan per the CASQA BMP Handbook. Sediment discharge to Delta waters violates Porter-Cologne and the Clean Water Act, with substantial Regional Board fines. Wind erosion controls are critical on the valley floor.
San Joaquin County is inland and has NO California Coastal Commission jurisdiction — no coastal zone extends into the county. However, Delta waterfront development on the San Joaquin River, Mokelumne River, and Delta islands is regulated by the Delta Stewardship Council, Delta Protection Commission, Central Valley Flood Protection Board, and the U.S. Army Corps of Engineers.
San Joaquin County participates in FEMA's National Flood Insurance Program and maintains a CRS Class 7 rating, providing 15% flood insurance discounts in high-risk areas. San Joaquin County is a member of SJAFCA and completed major levee improvements. Floodplain management administered by Public Works (209) 468-3090.
FEMA Flood Maps - National Flood Insurance Program
Floods occur naturally and can happen almost anywhere. They may not even be near a body of water, although river and coastal flooding are two of the most common types. Heavy rains, poor drainage, and even nearby construction projects can put you at risk for flood damage. Flood maps are one tool that communities use to know which areas have the highest risk of flooding. FEMA maintains and update...
San Joaquin County requires a grading permit from Public Works for earth-moving over 50 cubic yards or any work within a flood zone, levee, or sensitive area. Plans must show drainage that does not redirect water onto adjoining properties and must meet FEMA flood elevation requirements in mapped SFHAs. Grading in Primary Zone Delta is severely restricted.
4 cities in San Joaquin County have their own environmental rules rules. Each link goes to that city's dedicated page with code citations.
See every category we cover for San Joaquin County — parking, noise, fences, fires, animals, pools, and more.
San Joaquin County Ordinance Hub →