Williamson Act program

Community Development Agency

The County of Marin Williamson Act program

Preserving agricultural land in Marin County is encouraged by both local communities and the Marin County Board of Supervisors. Zoning regulations restrict the uses of some land to agriculture and the County offers certain tax benefits to property owners who commit to using their land for commercial agricultural production. These tax benefits rely on a State law known as the California Land Conservation Act of 1965, also known as the Williamson Act. The Williamson Act allows the owner of an agricultural property to enter into a contract with the County that restricts the use of the land to agricultural purposes and eliminates the potential subdivision of the land in exchange for a reduction in the land’s assessed value, which decreases the property taxes.

Provided below are links to several documents related to Williamson Act contracts, including background information and the application form required to apply for a Williamson Act contract. There is currently no fee associated with submitting a Williamson Act contract application.

For additional information regarding applying or existing contracts, please contact the Marin County Planning Division at (415) 473-6269 or via email. For matters related to valuation, contact the Marin County Assessor’s Office at (415) 473-7215.