10 county-level rules, plus city-specific rules for 10 cities in Orange County, California.
Verified from official government sources
Orange County enforces stormwater quality under two Phase I NPDES MS4 Permits issued by the Santa Ana and San Diego Regional Water Quality Control Boards. Title 9 of the OCCO (Water Quality) and the NPDES program require all construction and development projects in unincorporated areas to implement Best Management Practices (BMPs) and submit a Water Quality Management Plan (WQMP) before grading or building permits are issued.
Orange County requires Erosion and Sediment Control Plans (ESCPs) for all grading and building projects in unincorporated areas. The OC Grading and Excavation Code (OCCO Title 7, Division 1, Article 8) and the NPDES MS4 permit mandate erosion prevention BMPs during construction to protect waterways and coastal resources.
Development within the coastal zone of unincorporated Orange County requires a Coastal Development Permit (CDP) under OCCO §7-9-127 and the California Coastal Act. The County has certified Local Coastal Programs for the Newport Coast, Emerald Bay, and Aliso Viejo segments, with the California Coastal Commission retaining jurisdiction over uncertified segments.
California Coastal Commission — Coastal Zone Boundary
Coastal Zone Boundary Del Norte Humboldt Mendocino Sonoma Marin San Francisco San Mateo Santa Cruz Monterey San Luis Obispo Santa Barbara Ventura Los Angeles O...
Orange County participates in the National Flood Insurance Program and enforces floodplain construction standards in mapped Special Flood Hazard Areas across unincorporated communities and county-administered watersheds.
The Orange County Grading and Excavation Code (OCCO Title 7, Division 1, Article 8) requires grading permits for all excavation and earthwork in unincorporated areas. Section 7-1-805 prohibits grading, clearing, brushing, or grubbing without a permit from the Building Official. Drainage facilities must conform to Subarticle 11 of the OC Grading Manual.
Orange County manages coastal shoreline through OC Public Works and the California Coastal Commission. Unincorporated coastal areas require Coastal Development Permits for construction near the shoreline. Beach nourishment and erosion control projects are managed at the county level.
California Air Resources Board regulations limit diesel-fueled commercial vehicle idling to five minutes statewide, applying countywide in Orange County including ports, distribution centers, and school drop-off zones.
California Assembly Bill 1346 phases out the sale of new gas-powered leaf blowers and small off-road engines, applying countywide in Orange County including all 34 cities and unincorporated areas.
Orange County adopted a Climate Action Plan committing to reduce greenhouse gas emissions across county facilities, fleet, and unincorporated land use, aligning with California statewide carbon-neutrality targets by 2045.
California Title 24 Part 6 energy standards require cool roof reflectivity for most new and replacement low-slope roofs in Orange County's climate zones 6, 8, and 10, covering all cities and unincorporated areas.
10 cities in Orange County have their own environmental rules rules. Each link goes to that city's dedicated page with code citations.
8 verified rules • Climate Emergency Mobilization, Coastal Development
12 verified rules • Climate Emergency Mobilization, Coastal Development
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
2 verified rules • Flood Zones, Stormwater Management
5 verified rules • Coastal Development, Erosion Control
1 verified rule • Flood Zones
8 verified rules • Boat Dock Permits, Coastal Development
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Orange County Ordinance Hub →