Environmental Rules in Los Angeles County, CA (2026)
7 county-level rules, plus city-specific rules for 21 cities in Los Angeles County, California.
Verified from official government sources
Stormwater Management
All grading in unincorporated LA County must comply with NPDES requirements: best management practices must be installed before grading begins and maintained until permanent drainage is in place, or daily fines up to $500 per day apply.
Environmental: Stormwater
Significant RestrictionsLos Angeles County Code § J110.8
J110.8 National Pollutant Discharge Elimination System (NPDES) compliance. J110.8.1 General. All grading plans and permits and the owner of any property on which such grading is performed shall comply with the provisions of this Section for NPDES compliance. All best management practices shall be installed before grading begins or as instructed in writing by the Building Official for unp...
Erosion Control
All cut and fill slopes in unincorporated LA County must be planted and irrigated to prevent erosion, with taller slopes requiring both ground cover and shrubs or trees at specific spacing: planting must be established before the county grants final grading approval.
Environmental: Erosion Control
Significant RestrictionsLos Angeles County Code §§ J110.1, J110.3
J110.1 General. The faces of cut and fill slopes shall be prepared and maintained to control erosion. This control shall consist of effective planting, erosion control blankets, soil stabilizers, or other means as approved by the Building Official. J110.3 Planting. The surface of all cut slopes more than 5 feet (1.5 m) in height and fill slopes more than 3 feet (0.9 m) in height shall be...
Coastal Development
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.
LA County Coastal Development Rules
Some RestrictionsCalifornia 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...
Flood Zones
Grading, excavation, and fill are prohibited in designated floodways in unincorporated LA County unless a California-licensed civil engineer certifies in a hydraulic analysis that the work will not raise the base flood level.
Environmental: Flood Zones
Heavy RestrictionsLos Angeles County Code § J101.2
J101.2 Flood hazard areas. Unless the applicant has submitted a hydrology and hydraulic analysis, prepared in accordance with standard engineering practice by a California licensed civil engineer, that demonstrates the proposed work will not result in any increase in the level of the base flood, grading, excavation and earthwork construction, including fills and embankments, shall not be per...
Boat Dock Permits
In unincorporated Los Angeles County, marinas, small boat harbors, docks, piers, boat launches, and similar recreational facilities need a Conditional Use Permit in Zone O-S (Open Space) and are not permitted in Zones A-1, A-2, R-R, or W. Table 22.16.030-B of the County Code sets this, and none of the five zones offers a by-right or ministerial approval for these facilities.
Los Angeles County Marina, Dock and Pier Zoning Rules
Significant RestrictionsLos Angeles County Code § 22.16.030, Table 22.16.030-B
- Not Permitted P Permitted AP Animal Permit Chapter 22.152 CEM Cemetery Permit Chapter 22.154 CUP Conditional Use Permit Chapter 22.158 ... TABLE 22.16.030-B: PRINCIPAL USE REGULATIONS FOR AGRICULTURAL, OPEN SPACE, RESORT AND RECREATION, AND WATERSHED ZONES A-1 A-2 O-S R-R W Additional Regulations ... Marinas, small boat harbors, docks, piers, boat launches, and similar recreational facilities...
Defensible Space
Los Angeles County's defensible space rules require specific vegetation management within 100 feet of structures on or adjacent to brushland. Dead vegetation must be removed continuously, firewood stored 30 feet from structures, and named flammable species like eucalyptus and pampas grass must be cleared regardless of ornamental status.
Environmental: Defensible Space
Significant RestrictionsLos Angeles County Code Title 32 (Fire Code), §§ 325.2.1.1, 325.2.1.3, 325.2.1.5, and 325.2.1.6
§ 325.2.1.1 Ornamental plants and trees. Ornamental plants and trees known to be flammable — including but not limited to acacia, cedar, cypress, eucalyptus, juniper, pine, and pampas grass — shall not be exempt from compliance with these requirements. § 325.2.1.3 Dead vegetation. Remove all dead or dying grass, plants, shrubs, trees, branches, leaves, weeds, and pine needles. Maintain any tree...
Flood Elevation Requirements
In the unincorporated Santa Monica Mountains Coastal Zone, new residential construction in FEMA A, AE, or AH flood zones must have its lowest floor built at least one foot above the base flood elevation.
Los Angeles County Coastal Flood Elevation Rule
Some RestrictionsLos Angeles County Code Section 22.44.2102(I)(4)
For residential structures in Zones A, AE, or AH on a FIRM, the lowest floor (including basement) shall be elevated at least one (1) foot above the base flood elevation, where base flood shall mean a flood having a one percent chance of being equaled or exceeded in every year (a 100-year flood).
Environmental Rules by City in Los Angeles County
21 cities in Los Angeles County have their own environmental rules rules. Each link goes to that city's dedicated page with code citations.
6 verified rules • Coastal Development, Defensible Space
7 verified rules • Boat Dock Permits, Coastal Development
6 verified rules • Coastal Development, Defensible Space
4 verified rules • Coastal Development, Erosion Control
5 verified rules • Defensible Space, Erosion Control
4 verified rules • Erosion Control, Flood Elevation Requirements
3 verified rules • Coastal Development, Erosion Control
1 verified rule • Coastal Development
6 verified rules • Coastal Development, Defensible Space
3 verified rules • Coastal Development, Erosion Control
5 verified rules • Coastal Development, Erosion Control
4 verified rules • Coastal Development, Erosion Control
1 verified rule • Coastal Development
5 verified rules • Defensible Space, Erosion Control
4 verified rules • Erosion Control, Flood Elevation Requirements
5 verified rules • Coastal Development, Erosion Control
4 verified rules • Erosion Control, Flood Elevation Requirements
3 verified rules • Erosion Control, Flood Zones
4 verified rules • Erosion Control, Flood Elevation Requirements
3 verified rules • Flood Elevation Requirements, Flood Zones
1 verified rule • Flood Zones
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