Recycled Water Pipeline Expansion Project

June  05, 2017

NapaSan and Napa County are pleased to announce the beginning of construction of a 1.4-mile extension to the 5-mile Milliken-Sarco-Tulocay (MST) recycled water pipeline. Construction is scheduled to take place between June 9th and September 30th, 2017. The project is being constructed through a partnership between NapaSan, Napa County, and property owners that have joined the specially formed MST Community Facilities District (CFD) to fund the project. The pipeline will provide recycled water for turf irrigation at the Silverado Middle School, Tulocay Cemetery, and vineyard parcels along Coombsville Road. The pipeline extension will contribute to reduced demand for groundwater and save potable water from being used for irrigation.

This recycled water pipeline expansion project is paid for by the customers using the recycled water and grant funding obtained by NapaSan and project partners. Federal grants were awarded to NapaSan to decrease the voluntary tax payments owed by the properties connecting to the pipeline. NapaSan is seeking additional grant money to further offset the costs to users and Napa County has obtained a low interest State Revolving Fund loan to finance the project.

The pipeline will be constructed in the west-bound lane of Coombsville Road between Terrace Drive and Second Avenue. In order to minimize impacts to the public, the project has been scheduled to complete work in the vicinities of Silverado Middle School and Mount George Elementary School during the students’ summer break period. One-way controlled traffic with delays up to 15 minutes should be anticipated. Detour routes include Hagen Road, Second Avenue, and Fourth Avenue.

Regular working hours will be between the hours of 7:00 am and 6:00 pm Monday through Friday. Local residents along Coombsville Road will receive notices prior to work adjacent to private property. Access to driveways and businesses will be accommodated at all times, or special arrangements will be made for access. Pedestrian and bicycle access will also be maintained daily. There will be no disruption to normal services including mail and garbage. Emergency vehicle access will be available at all times.

Properties along the existing recycled water pipeline and the current extension on Coombsville Road still have the opportunity to join the recycled water Community Facilities District this summer to use recycled water for vineyard and landscape irrigation. Participation in the CFD is strictly voluntary. Interested property owners should contact NapaSan for additional information.

The high-quality recycled water will come from the NapaSan’s Soscol Water Recycling Facility. Recycled water is wastewater that has been highly treated and disinfected to provide a safe, non-potable water supply. NapaSan’s recycled water meets the stringent water quality guidelines set by the California Department of Public Health.

NapaSan provides wastewater collection, treatment, and distribution services to the residents and businesses in the City of Napa, Silverado Country Club, the Napa County Airport and several adjacent unincorporated areas. NapaSan also provides recycled water service to portions of southern Napa County. Covering 20 square miles, NapaSan has been serving the community since November 1945. For further information, please see