3 county-level rules, plus city-specific rules for 3 cities in Solano County, California.
Verified from official government sources
Unincorporated Solano County operates under a Phase II NPDES Small MS4 stormwater permit from the State Water Resources Control Board. Any construction or grading project that creates 2,500 square feet or more of impervious surface in the unincorporated county must obtain a grading permit under Solano County Code Chapter 31, which incorporates NPDES stormwater requirements including a Storm Water Pollution Prevention Plan (SWPPP) for larger sites.
Solano County Code Chapter 31 — Grading, Drainage, Land Leveling, and Erosion Control — is the County's grading and erosion-control ordinance. Most ground-disturbing work in unincorporated Solano County requires a grading permit issued by the Resource Management Department, and that permit incorporates erosion- and sediment-control conditions. Small-fill projects (under 50 cubic yards, under 5,000 sq ft, under 3 ft deep, on slopes flatter than 7:1) are exempt if they meet narrow criteria.
Solano County participates in the National Flood Insurance Program (NFIP) and regulates development in mapped Special Flood Hazard Areas (SFHAs) under Solano County Code Chapter 12.2 — Flood Damage Prevention. Large floodplain areas exist along the Sacramento River and Suisun Marsh, around Putah Creek, and along many smaller drainages. Any building, zoning, use, or grading permit within an SFHA is referred to the Floodplain Administrator before approval.
3 cities in Solano County have their own environmental rules rules. Each link goes to that city's dedicated page with code citations.
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