This project involves the installation of 24-inch and 8-inch welded steel pipe, valves, associated electrical components, and appurtenances at the Bon Tempe Treatment Plant.
The backwash system is a vital component in the treatment process as it allows water to flow by gravity from the wash water storage tank through the plant’s four filter beds in order to clean the filters. An uncleaned filter bed results in restricted flow through the filter media and through the plant, reducing the overall capacity of the plant. The backwash process cleans the filters which allows for optimized flow of water through the plant filter beds.
Construction Update (September 2026)
The contractor has completed the installation of the new backwash valve actuator, which automates filtration system cleaning, and the 8-inch house water piping. The District will wrap up this project in September after testing the new backwash valve before the existing valve is permanently taken out of service.
Schedule and Status
Design: Winter 2025 – Fall 2025
Construction: October 2025 – Spring 2026
Contact Information
- Marin Water Construction Management team: 415-945-1560
Investing in your water system
The replacement and installation of the new backwash valves and bypass will ensure proper functionality of the Bon Tempe Treatment Plant backwash system while enhancing the operational reliability of the water treatment infrastructure.
Funding Sources
| Capital Maintenance Fund | Other Funding Sources | Total |
| $1,200,960 | – | $1,200,960 |