Construction Updates

If you have questions about any district construction projects, please contact MMWD's Engineering Division at 415-945-1560.


Ross Reservoir

Ross Reservoir is a 1 million gallon potable water storage facility that was built in 1927. It currently provides treated water for approximately 20 percent of MMWD's service area. The reservoir is located on a hillside north of Phoenix Lake.

The purpose of the Ross Reservoir Landslide Repair Project is to stabilize the landslide and remove the threat it poses to Ross Reservoir and the surrounding area.

Sir Francis Drake Boulevard Pipeline Replacement Project

Marin Water is installing a new pipeline under a portion of Sir Francis Drake Boulevard in Kentfield, replacing old pipes that date back to 1920. The new pipeline, which also has features that will improve its seismic reliability, is part of our ongoing work to upgrade aging infrastructure and improve the overall reliability of our system. The cost of the project is $3.9 million, and the majority of the work will occur at night to minimize traffic disruptions. Drivers in the area can expect partial lane closures and some traffic delays.

Construction is being done in tandem with Marin County’s Sir Francis Drake Boulevard Rehabilitation Project, “Upgrade the Drake,” to reduce costs and minimize disruptions. Construction began in June and continues through June of 2022.

To learn more, call 415.688.7613 or visit

MMWD April 2019 - Present:  Almonte - 75% Complete

MMWD will install new pipelines in various streets including Rosemont Avenue, Greenhill Road and Almonte Boulevard in the unincorporated communities of Almonte and Homestead. Learn more.