14 county-level rules, plus city-specific rules for 19 cities in Los Angeles County, California.
Verified from official government sources
Unincorporated LA County falls under the LA County MS4 NPDES permit. The LACFCD operates one of the largest flood protection systems in the world, including 14 dams and 80,000+ catch basins. Low Impact Development standards apply to new construction. The district captures and infiltrates 270,000+ acre-feet annually.
Construction in unincorporated LA County must implement erosion control BMPs per NPDES stormwater permits. Projects over 1 acre require a SWPPP. The county's diverse terrain (mountains, hillsides, coastal bluffs) makes erosion control critical. Grading permits include erosion control requirements.
Several unincorporated LA County areas fall within the California Coastal Zone, including communities near Malibu and the Santa Monica Mountains. Coastal development permits from the California Coastal Commission may be required. LA County DRP administers local coastal programs for unincorporated coastal areas.
California Coastal Commission — Coastal Zone Boundary Maps (PRC Sec. 30103)
Public Resources Code (PRC) Section 30103(a) specifically defines California's Coastal Zone as that land and water area of the State of California from the Oregon border to the border of the Republic of Mexico depicted on maps identified and set forth in Section 17 of that chapter of the Statutes of the 1975-76 Regular Session enacting PRC Division 20 (the Coastal Act of 1976). PRC Section 3010...
LA County Code Title 11, Chapter 11.60 establishes floodway regulations for unincorporated areas. Development within FEMA flood zones requires compliance with NFIP standards. The County Flood Zone Determination website maps all flood hazard areas.
Grading in unincorporated LA County requires permits from Building & Safety. The LA County Flood Control District manages the regional drainage system with 487 miles of channels and 2,919 miles of storm drain. Retaining walls over 4 ft require permits. Coastal areas have additional requirements for terracing and landscaping.
Los Angeles County enforces shoreline management regulations for its extensive coastline and waterways in unincorporated areas. Development within the coastal zone requires compliance with the California Coastal Act and the county's Local Coastal Program. Projects near beaches, harbors, and coastal bluffs are subject to stringent setback, access, and environmental review requirements administered by the Department of Regional Planning.
Properties in mapped Very High Fire Hazard Severity Zones must maintain 100 feet of defensible space under California PRC §4291 and LACo Fire Code Title 32 §4906, with annual LACoFD Forestry Division inspections in Malibu, Topanga, Altadena, and Antelope Valley foothills.
California Code of Regulations Title 13 §2485 caps heavy-duty diesel idling at five minutes statewide, enforced across LA County by CARB and SCAQMD Rule 1102. LA County's fleet idle-reduction policy adds matching limits for county-owned trucks and buses.
California AB-1346 bans the sale of new gas-powered leaf blowers and other small off-road engines under 25 horsepower starting 2024, applying countywide. LA County does not have a separate countywide blower ban, but several incorporated cities layer their own operating prohibitions.
AB-1346 / Cal. Health & Safety Code § 43018.11 - Small Off-Road Engine Phase-Out
(a) (1) By July 1, 2022, the state board shall, consistent with federal law, adopt cost-effective and technologically feasible regulations to prohibit engine exhaust and evaporative emissions from new small off-road engines, as defined by the state board. Those regulations shall apply to engines produced on or after January 1, 2024, or as soon as the state board determines is feasible, whicheve...
Los Angeles County adopted its OurCounty Sustainability Plan in 2019 with binding climate targets, paired with a Climate Vulnerability Assessment guiding adaptation. The Chief Sustainability Office coordinates 159 actions across 12 goals targeting carbon neutrality by 2050 in unincorporated areas.
Los Angeles County's Environmentally Preferable Purchasing Policy at LA County Code Title 2.205 directs all departments to prioritize recycled-content, energy-efficient, and low-toxicity products. Internal Services manages a zero-emission fleet replacement schedule for county-owned light-duty vehicles.
LA County Public Works runs cool pavement pilots in unincorporated communities like Pacoima-adjacent areas to lower surface temperatures during heat waves. The reflective coatings reduce roadway temperatures by up to 10 to 15 degrees Fahrenheit on summer afternoons.
LA County Code Title 31 Green Building Standards and Title 26 Building Code adopt CALGreen Title 24 Part 11 baseline requiring cool roofing on new construction and major reroofs in unincorporated areas. Reflective materials must meet minimum solar reflectance and thermal emittance ratings.
The OurCounty Sustainability Plan and Climate Vulnerability Assessment identify Heat Equity Zones, where LA County deploys cool roofs, cool pavement, tree canopy, and cooling-center activations when forecast highs exceed 95 degrees Fahrenheit for two or more days.
19 cities in Los Angeles County have their own environmental rules rules. Each link goes to that city's dedicated page with code citations.
14 verified rules • Climate Emergency Mobilization, Coastal Development
10 verified rules • Climate Emergency Mobilization, Coastal Development
6 verified rules • Coastal Development, Defensible Space
5 verified rules • Coastal Development, Erosion Control
5 verified rules • Coastal Development, Erosion Control
5 verified rules • Coastal Development, Erosion Control
5 verified rules • Coastal Development, Erosion Control
5 verified rules • Coastal Development, Erosion Control
5 verified rules • Coastal Development, Erosion Control
5 verified rules • Coastal Development, Erosion Control
5 verified rules • Coastal Development, Erosion Control
5 verified rules • Coastal Development, Erosion Control
5 verified rules • Coastal Development, Erosion Control
5 verified rules • Coastal Development, Erosion Control
4 verified rules • Erosion Control, Flood Zones
5 verified rules • Coastal Development, Erosion Control
5 verified rules • Coastal Development, Erosion Control
5 verified rules • Coastal Development, Erosion Control
5 verified rules • Coastal Development, Erosion Control
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