3 county-level rules, plus city-specific rules for 1 city in Napa County, California.
Verified from official government sources
Stormwater discharges in unincorporated Napa County are regulated through the Napa Countywide Stormwater Pollution Prevention Program, the State Construction General Permit, and Napa County Construction Site Runoff Control Requirements adopted by the Board of Supervisors on December 12, 2006. Permit Sonoma equivalents do not apply; Napa County Public Works Engineering Division administers locally.
Napa County regulates erosion control through Napa County Code Chapter 18.108 (Conservation Regulations) and Chapter 13.15 (Grading Control). Any agricultural earthmoving, grading, or vineyard replanting on slopes over five percent requires an approved Erosion Control Plan from the Napa County Conservation Division before work begins.
Napa County administers floodplain development under Napa County Code Chapter 16.04 (Flood Management) and participates in the National Flood Insurance Program. The county holds a FEMA Community Rating System class 7, providing flood insurance premium discounts. Napa River, Napa Creek, Conn Creek, and Dry Creek define the principal Special Flood Hazard Areas.
1 cities in Napa County have their own environmental rules rules. Each link goes to that city's dedicated page with code citations.
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Napa County Ordinance Hub →