Conservation Division

The Conservation Group handles matters related to erosion control plans, agricultural preserve (Williamson Act) contracts, and mining inspections/permits, as well as completes California Environmental Quality Act (CEQA) reviews for Capital Improvement Projects and serves as a resource to other departments and the public for guidance on tree removal, streams, fire impacts and recovery, and related topics. Conservation also provides staff support for the Wildlife Conservation Commission

  1. Programs
  2. Services & Useful Links
  3. Boards & Commissions

Erosion Control Plans

The Napa County Conservation Regulations (Napa County Code 18.108) require evaluation of agricultural/vineyard or development plans on slopes over 5% through the review of an Agricultural Erosion Control Plan.  The review includes evaluation of conformance with the Conservation Regulations and the California Environmental Quality Act (CEQA).

Williamson Act Agricultural Contracts

The Williamson Act created the state program enabling the County to enter into contracts with land owners to voluntarily restrict parcel use to agricultural in return for preferential property tax assessments. For more information about this program, see the Williamson Act Brochure and Williamson Act Application.  If you have questions please contact Don Barrella at 707-299-1338 or

Mine & Quarry Oversight

Napa County conducts annual inspections and review of reclamation plans and security assurances. If you'd like to learn more about this program contact Don Barrella at 707-299-1338 or