Browns Valley Trunk Project

What is the Browns Valley Trunk Project?

Wastewater from the Browns Valley area and Southwest Napa currently flows through the sewer pipelines to the West Napa Pump Station on its way to the treatment plant.  The Browns Valley Trunk Project is designed to intercept this wastewater and divert the flow away from sewer lines that are over capacity via a new pipeline that will deliver the wastewater to NapaSan for treatment.  

Why is this project necessary?

The sewer pipes in Southwest Napa are over capacity in many areas, meaning that these pipes are in danger of overflowing when there are high flow events, such as a large storm.  Sewer overflows can result in untreated sewage getting into storm drains and flowing to creeks or the river, which is bad for both human and environmental health.  The Browns Valley Trunk project is designed to divert flow from sewer lines that are over capacity. 

When and where will construction be taking place?

Construction will begin in March of 2020 and continue through fall of 2021.  The map below shows the project area.

Proposed Browns Valley Trunk Sewer Alignment

Will there be community meeting where I can learn more about this project?

Two community meetings will be held in the Spring of 2020 prior to the start of construction.  As soon as the meeting details are finalized, they will be posted here.   

Do you want to receive email updates regarding the Browns Valley Trunk Project?

To receive emails regarding the status of the Browns Valley Trunk Project, sign up here.


If you have further questions concerning the project, please call (707)312-1589 or email

Browns Valley Project Documents