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The mission of the Marin County Flood Control and Water Conservation District (District) is to reduce the risk of flooding for the protection of life and property while utilizing sustainable practices.

Flood control zones

The District's core work is the operation and maintenance of flood facilities within eight flood control zones. Each zone addresses specific watershed flooding problems.

Activities and facilities

The District performs the following activities for certain County-owned facilities:


  • Planning
  • Design
  • Construction
  • Operation
  • Maintenance

District-owned facilities

  • Stormwater pump stations
  • Detention basins
  • Bypass drains
  • Creeks
  • Ditches
  • Levees
  • Wetlands

Marin County Watersheds

The District has used a Watershed approach for many years. The approach provides a framework to effectively integrate flood risk reduction and environmental restoration efforts with public and private partners by focusing on the unique needs of the various geographic areas of Marin.


The District’s geographical boundary is the same as the County of Marin's.

View maps for the District.


The District as a whole has no source of revenue or source of funds.

Annual revenue is collected through ad valorem taxes and other assessments. These are paid by property owners in one of eight Zones. The Zones cover distinct geographical areas within the District.

All revenues in the District are collected through the Zones and must be spent in the Zone that provides the funding. The District also uses grant funds for some projects. You can learn about grants on specific project pages.

Learn more about the District's budget.

Details for revenue and budgets for individual zones are recommended by advisory boards. You can find reports in the advisory board meeting archives.


Learn about current bidding opportunities for our projects at the County of Marin's bids and proposals webpage.

For information about existing or past contracts, please contact us.


Internal audits are conducted by the County of Marin's Department of Finance.


County of Marin employees within Public Works and other County Departments perform work for the District .  Actual costs are reimbursed by each Flood Zone to the County.

The District is largely staffed by the Marin County Department of Public Works, under direction of the Marin County Board of Supervisors acting as the Board for the District. Their mission is to serve the people of Marin by providing a safe environment and enhanced quality of life through improvements to and maintenance of public infrastructure. The Department also provides timely and efficient service and support to other County departments and local agencies to assist them in achieving their goals.

Learn more about this in section 7 of the Water Code Appendix Chapter 68.

Learn more about County job classifications and salaries.


The five members of the Marin County Board of Supervisors serve on the District’s board.

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