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Marin Water is working to replace aging and leak-prone underground water pipeline along streets in Marin City. More than 3.6 miles of existing cast iron, galvanized steel, and cement water main will be replaced with modern, seismically resilient welded steel pipe with a life expectancy well over 100 years. New service laterals from the main to the service meters will also be replaced as part of this project. Owned by Marin Water, these mains are large underground sections of pipeline that carry treated drinking water from Marin Water’s pumping stations to customer properties. This project will also replace 192 service laterals, which is Marin Water-owned piping that connects the water main to the service meter and subsequent customer-owned piping. The project will occur in two phases, and is expected to conclude in the fall of 2026.
Project Outreach
Project Update (Jan. 24, 2025) Construction is underway and the first phase is expected to be completed in the fall of 2025. The second phase will begin immediately after completion of the first phase. |
What to expect
- Construction will occur on weekdays, 8 a.m. to 5 p.m. Setup and cleanup activities may occur outside of this timeframe.
- Heavy equipment and construction personnel will be on the roadway. Please follow traffic control signs, reduce vehicle speed and allow for extra time to drive through the area.
- Your water service may be interrupted for short periods of time. If so, Marin Water will notify you 24-48 hours in advance by hanging a notice of the planned water shut-off on your front gate or door. If a medical condition exists which requires that you receive continuous water service, notify us at 415.945.1560 as soon as possible.
- Marin Water and the project contractor will take all measures possible to minimize inconveniences associated with this project, including noise and traffic delays.
Contact Information
- Marin Water Construction Management team: 415.945.1560
Benefits
This pipeline replacement project will:
- Ensure high-quality drinking water for Marin City now and for the future
- Eliminate water waste caused by large leaks in the water system
- Reduce water service interruptions that have previously impacted Marin City
- Strengthen the water system to better withstand and more quickly recover from natural disasters such as earthquakes or wildfires
Schedule and Status
- Design: Summer 2022 - Fall 2025
- Phase I Construction: Winter 2025 - Fall 2025
- Phase II Construction: Fall 2025 - Fall 2026
Funding Sources
This project is largely funded through part of a larger $6.4 million grant awarded by the California Department of Water Resources. The remainder is funded through Marin Water's Capital Maintenance Fund.
| Project | Marin City Pipeline Replacement Project |
| Program | A1A02A Replacements - Distribution Pipelines |
| Project Number | D23007 |
| Contact | Marin Water Construction Management team: 415.945.1560 |
Marin City Climate Resiliency, which worked hard to help secure the grant funding, is partnering with Marin Water to provide project outreach and engagement to the community.