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Treehaven Pipeline Replacement - Fire Flow Improvement Program

Construction update (updated April 6, 2023)

Marin Water is installing more than a mile of 8- and 6-inch pipe, replacing leak-prone, fire flow-deficient 4-inch cast iron pipe originally installed in San Rafael nearly 100 years ago. 

The project will improve fire flow and seismic reliability in this area and is in support of the District’s voter-approved Fire Flow Improvement Program. 

Work on this project commenced in April 2023 after prior delays due to material lead time issues and supply chain disruptions. 

Contact Information

Marin Water Construction Management team, 415-945-1560

Fire Safety and Emergency Preparedness Critical

This project increases the volume of water available for fighting fires as part of Marin’s Fire Flow Program. Developed together with residents, city and county officials, area fire chiefs and residents – and approved by voters - the Marin Fire Flow Program is being implemented by Marin Water over the next 15 years to address a key public safety concern in the region.


Project Treehaven Pipeline Replacement Project - Fire Flow Improvement Program 
Program A2A Fire Flow Improvement 
Project Number F210033
Contact Hagar Negash | 
Map of pipeline location in Sun Valley on multiple streets
Street beside Andy's Sun Valley Market

Project Description 

Installation of 3950 feet of 8-inch pipe and 2710 feet of 6-inch pipe to replace leak prone, fire flow deficient 4-inch cast iron pipe in San Rafael from 1927. This project will improve fire flow and seismic reliability in this area and is in support of the District’s Fire Flow Improvement Program. 


This project will have multiple benefits, including increased fire flow for the Treehaven neighborhood, replacing, and upgrading a 90-year-old leak prone pipe. 

Schedule and Status

Design: Spring 2021 - Fall 2022

Construction: Spring 2023 - Winter 2023/24

Expenditure Schedule

Actuals Through 
FY 22 (Rounded) 
FY 23 

Funding Sources 

Capital Maintenance Fund 
Fire Flow Improvement Program Fund