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The Land Conservation Act

The California Land Conservation Act of 1965--commonly referred to as the Williamson Act--enables local governments to enter into contracts with private landowners for the purpose of restricting specific parcels of land to agricultural or related open space use. In return, landowners receive property tax assessments which are much lower than normal because they are based upon farming and open space uses as opposed to full market value. The Open Space Subvention Act of 1971 provided local governments an annual subvention of forgone property tax revenues from the state through the year 2009; these payment have been suspended in more recent years due to revenue shortfalls.

​Open Space Subvention Act Survey​ - Now Available

The Fiscal Year 2016-2017 (FY 2016) Survey of Participation in the Land Conservation Act and Open Space Subvention Act (OSSA) is now available.​​​  Please go to the Open Space Subvention Payments​ page to obtain the survey forms and for further information on the reporting requirements.

Legislation and Policy

AB 1265 - Advisory Statement (PDF) 
Recapture of Property Tax Loss  

Equine Facilities Policy (PDF)

​Data and Maps

 Williamson Act Status Reports

The 2014 Status Report is the most recent available.  Check out this page for reports dating back to 1989.

Land Conservation Act Maps (PDF)

Maps on program enrollment status, as provided by participating counties.  The most recent data submitted has been posted.  

Working with the LESA Model

The Land Evaluation and Site Assessment (LESA) Model evaluates agricultural characteristics of specific sites, as indicated in California Environmental Quality Act (CEQA) guidelines.


Division of Land Resource Protection 

Division of Land Resource Protection