Environmental Rules in Placer County, CA (2026)
6 county-level rules, plus city-specific rules for 1 city in Placer County, California.
Verified from official government sources
Stormwater Management
Placer County's Stormwater Quality Ordinance bans illicit discharges into the county storm drain system across the unincorporated area. The Department of Public Works enforces the rule against dumping, construction runoff and illegal storm-drain hookups, with notices of noncompliance, compliance orders, citations and misdemeanor charges available for violations.
Placer County Stormwater Discharge Rules
Some RestrictionsPlacer County Code § 8.28.080
Except as provided in Section 8.28.090 of this article, it is unlawful for any person to make or cause to be made any illicit discharge into the storm drain system. Notwithstanding the exemptions provided by Section 8.28.090, if the enforcement agency determines any otherwise exempt discharge causes or significantly contributes to violations of any plan standard, or conveys significant quantiti...
Erosion Control
Unincorporated Placer County requires a separate erosion and sediment control plan on top of any grading permit once a project crosses set thresholds, such as over 10,000 square feet of graded slope steeper than 10% or grading within 50 feet of a watercourse. Rainy-season deadlines and stop-work authority back it up.
Placer County Erosion & Sediment Control
Some RestrictionsPlacer County Code § 15.48.650(B)
An erosion and sediment control plan shall be required whenever: 1. The graded portion of the site includes more than 10,000 square feet of area having a slope greater than 10%; 2. Clearing and grubbing of areas of one acre or more regardless of slope; 3. There is a significant risk that more than 2,500 square feet will be unprotected or inadequately protected from erosion during any portion of...
Flood Zones
Placer County participates in the National Flood Insurance Program (NFIP) and enforces a Flood Damage Prevention Ordinance through Placer County Public Works. Any construction or development in a FEMA Special Flood Hazard Area (SFHA) requires a floodplain development permit and an Elevation Certificate.
Placer County Flood Zones and Floodplain Permits
Some RestrictionsPlacer County Flood Damage Prevention Ordinance, Article 15.52 (Floodplain Management)
Floodplain management is a community effort of corrective and preventive measures for reducing flood damage to properties. The program aims to protect public health and safety, reduce damage to buildings and contents, and prevent increases in flood damage from new construction. For building in flood areas, Placer County applies the Flood Damage Prevention Ordinance, Article 15.52. Residents in ...
Boat Dock Permits
Building, altering, or replacing a pier, floating dock, or other structure in the Lake Tahoe shorezone within unincorporated Placer County requires a county pier encroachment permit whenever it touches county-owned right-of-way, plus any building permit the work triggers. Article 12.32 of the Placer County Code also requires separate Tahoe Regional Planning Agency approval and, where state land is affected, a California State Lands Commission lease before the county will issue its own permit.
Placer County Lake Tahoe Pier & Dock Permits
Significant RestrictionsPlacer County Code §§ 12.32.030, 12.32.040
No person shall construct, maintain, alter, modify, or replace a structure within the shorezone without all required permits, including the following permits, as applicable. A. A county pier encroachment permit is required if the structure affects a county property interest. B. A county building permit for electrical, plumbing, or if required under the Placer County Code, other applicable regul...
Vehicle Idling Restrictions
Placer County caps engine idling at five consecutive minutes for heavy diesel trucks and off-road diesel equipment under County Code § 10.14.040, adopted to cut ozone precursor emissions in the non-attainment Sacramento air basin, with a minimum $50 civil penalty per violation.
Placer County 5-Minute Engine Idling Limit
Some RestrictionsPlacer County Code § 10.14.040
A driver of a vehicle: 1. Must turn off the engine upon stopping at a destination; and 2. Must not cause or allow an engine to idle at any location for more than five consecutive minutes. B. An equipment operator of an off-road piece of equipment not identified in subsection A of this section must not cause or allow an off-road piece of equipment to idle at any location for more than five conse...
Flood Elevation Requirements
In unincorporated Placer County, new construction and substantial improvements in a mapped special flood hazard area must have the lowest floor, including any basement, elevated at least one foot above the base flood elevation. The county recommends two feet for extra protection of floor joists and insulation.
Placer County Base Flood Elevation Rules
Some RestrictionsPlacer County Code § 15.52.170(C)(1)
New construction and substantial improvement of any structure shall have the lowest floor, including basement, elevated a minimum of one foot above the base flood elevation. It is recommended that the finish floor be a minimum of two feet above the base flood elevation in order to prevent inundation of floor joists, insulation and other appurtenant components located on the underside of the fin...
Environmental Rules by City in Placer County
1 cities in Placer County have their own environmental rules rules. Each link goes to that city's dedicated page with code citations.
All Placer County ordinances
See every category we cover for Placer County: parking, noise, fences, fires, animals, pools, and more.
Placer County Ordinance Hub →