Clean Water Program LogoCity of San Mateo LogoCity of Foster City LogoCity of San Mateo Public Works Logo


The Clean Water Program is a comprehensive plan to upgrade the aging wastewater collection and treatment system with advanced infrastructure that will provide reliable services for years to come to several communities in the San Francisco Bay area, including the cities of San Mateo, Foster City, and portions of Hillsborough, Belmont, Crystal Springs County Sanitation District, and the County of San Mateo. Many of these improvements are either in design or construction. Some of the construction has been completed.

Click and zoom to see what projects are happening in your neighborhood:

Latest News

The Latest on the County of San Mateo’s Health Orders

As the County of San Mateo’s COVID-19 Health Order continues to evolve, we follow all guidelines and safety instructions to ensure your infrastructure continues to improve during this time. Increased traffic and activity at the San Mateo County Event Center is expected now through the summer. Traffic patterns are expected to change over the coming weeks and could change suddenly. Please follow all directional street-level signage.

For more information about the area traffic congestion, go to: San Mateo, CA – Official Website.

Clean Water Program

What button


Who button


When button