Flood Control

Rosemarie Gaglione, Director, Public Works

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. The District aims to meet this mission through effective, transparent, and responsive planning, design, construction, operation, and maintenance of facilities such as stormwater pump stations, detention basins, bypass drains, creeks, ditches, and levees.

The District’s geographical boundary is the same as the County’s and, as a whole, it has no source of revenue. Instead, revenue is collected via ad valorem taxes and fees paid by property owners in one of eight zones covering distinct geographical areas within the District. All expenditures by the District require authorization by the Board of Supervisors of the District and the five members of the Marin County Board of Supervisors serve on the District’s board.

Eight zones have been established within the District to address specific flooding problems in eight watersheds across Marin County. These zones do not cover the entire county and are, for the most part, concentrated in the county’s eastern urbanized corridor. The vast majority of the county’s land area is not contained within a designated zone.

All zones, with the exception of Zone 10 - Inverness, are funded by annual revenues from ad valorem property taxes which vary considerably from one zone to another. The amount of revenue received from ad valorem property taxes in a particular zone is based on the total assessed value of property within the zone and the zone’s share of property taxes which was in effect at the time Proposition 13 became effective. Some zones have supplemental revenue from fees, assessments, and special taxes which were presented to and approved by the residents of the zone.

Each zone has an advisory board consisting of local residents who are appointed by the District Board of Supervisors. These advisory boards convene public meetings to review zone budgets, maintenance plans and potential construction projects, and to advise the District Board of Supervisors on these matters.

color coded map of marin county showing flood control zones