Feb. 4, 2025

As part of our commitment to delivering high quality, reliable water to our central and southern Marin County customers, Marin Water performs annual water main cleaning on a portion of our pipeline infrastructure. Also known as “flushing,” water main cleaning is required by state of California and the American Water Works Association. 

The process involves the targeted release of pressurized water through select hydrants to scour pipes and remove built-up sediment. The program is conducted by District employees, who remove debris, install storm drain covers and deploy dechlorination tablets prior to the flushing process to manage the discharge. 

Each year, Marin Water strives to clean 20% of our 109-mile pipeline network. This year’s cleaning work will take place Feb. 11-27 in and around Mill Valley, Marin City and Sausalito. Residents may notice some discoloration in their tap water during the process. 

The water main cleaning schedule is as follows: 

• Feb. 11-20 – Mill Valley, Tam Valley 
• Feb. 25-27 – Sausalito