Environmental Rules in Lake County, CA (2026)
6 rules for unincorporated Lake County, California.
Verified from official government sources
Stormwater Management
Lake County bans any non-storm water discharge into the County storm drainage system or natural surface waters outside limited exceptions the Director authorizes. Illicit connections, dumping refuse near storm drains, and violating an NPDES construction or industrial permit are all separately prohibited under Chapter 29 of the County Code.
Lake County Stormwater Discharge Rules
Some RestrictionsLake County Code § 29-10, § 29-48
10.1 It is unlawful for any person to make or cause to be made any non-storm water discharge into the County storm drainage system or directly to natural surface waters, except as allowed by the Municipal Storm Water Permit. ... 48.1 A violation of any provision of this chapter, any order issued pursuant to the chapter or any wastewater permit condition imposed pursuant to this chapter is punis...
Erosion Control
Commercial and industrial development in unincorporated Lake County must limit exposed soil, preserve natural drainage features, and install sediment basins under Zoning Ordinance Section 41.6. The Planning Director can require a technical report proving compliance before any zoning clearance or use permit issues.
Lake County Erosion Control Standards
Some RestrictionsLake County Zoning Ordinance, Art. 41 § 41.6 (Sec. 21-41)
41.6 Erosion control: The following erosion control standards shall apply to all development projects in commercial or industrial zoning districts: (a) The smallest practical area of land shall be exposed at any one time during development. (b) When land is exposed during development, the exposure shall be kept to the shortest practical period of time. (c) Natural features such as trees, groves...
Flood Zones
Any development or placement of structures inside a Special Flood Hazard Area in unincorporated Lake County needs a development permit reviewed by the county's Floodplain Administrator before it can be issued. New buildings must be elevated or floodproofed at least one foot above the base flood elevation, and violations are infractions carrying a fine plus daily penalties.
Lake County Floodplain Development Permit Rules
Some RestrictionsLake County Code §§ 25-3.3, 25-4.1
4.1 Development Permits. Any development or placement of structures in a Special Flood Hazard Area shall conform to the requirements of this chapter. No development permit required by the Lake County Ordinance Code shall be issued without a review by the Floodplain Administrator. ... 3.3 Compliance. No development shall hereafter be constructed, located, extended, converted, or altered without ...
Boat Dock Permits
Anyone building or altering a pier, dock, or boat ramp in Clear Lake's foreshore or nearshore must first get an administrative encroachment permit from Lakebed Management. Placement is capped at a strip beginning ten feet inside extended property lines, measured from the 7.79-foot Rumsey high water mark.
Lake County Clear Lake Boat Dock Permits
Some RestrictionsLake County Code § 23-4.1, § 23-6.2
4.1 When Required. No person shall undertake or carry out any of the following activities within the nearshore or foreshore without first obtaining an administrative encroachment permit from the Lakebed Management. (A) Constructing or placing any pier, boat ramp, boat launching facility, navigational structure, buoy, jetty, breakwater, marina, harbor, shorezone protective structure, or any othe...
Defensible Space
Improved parcels in unincorporated Lake County must maintain 30 feet of defensible space around every building, and the County Fire Official can extend that to 100 feet based on slope, fuel load and fuel type. State Public Resources Code section 4291 controls instead wherever it applies.
Lake County Defensible Space Requirement
Significant RestrictionsLake County Code § 13-60(60.2.1)(a), (60.2.2)
a. Maintenance of a thirty-foot (30-foot) defensible space around all buildings/structures. However, in all circumstances where California Public Resources Code section 4291 is applicable, that state law shall control. ... 2.2 If so determined by a County Fire Official or his or her designee, as defined herein, additional defensible space outward to one hundred (100) feet from all buildings and...
Flood Elevation Requirements
Unincorporated Lake County requires the lowest floor of new residential construction in a mapped Special Flood Hazard Area to sit at least one foot above the base flood elevation. The Floodplain Administrator, the Director of the Lake County Flood Control and Water Conservation District, reviews every development permit in these zones before it issues.
Lake County Flood Elevation Rules
Some RestrictionsLake County Code § 25-5.1(c)(1)
(1) Residential construction, new or substantial improvement, shall have the lowest floor, including basement, ... (ii) In an A zone, elevated at least one foot above the base flood elevation, as determined by the Floodplain Administrator. (iii) In all other zones, elevated at least one foot above the base flood elevation. (iv) In all flood hazard zones flood resistance materials and methods sh...
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