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.  In the map on the left below, red lines show sewers that can overflow during large storm events.  The map on the right shows the project’s proposed alignment (yellow) as well as the reduction in pipes that can overflow – the number of overcapacity pipes (red) significantly reduces from this project.

bvr_before     bvr_after_jpg
  Above left- Before the Browns Valley Trunk Project. Above right- After the Browns Valley Trunk Project.


When and where will construction be taking place?

Construction will being in March of 2019 and continue through fall of 2020. The map below shows the project area.

 Attachment A - Proposed Trunk Sewer

Will there be community meetings where I can learn more and give feedback about this project?

Yes. NapaSan will be holding community meetings in Fall 2017 and early 2018 where members of the public are encouraged to come and learn about the project details.   

 Two meetings were held in 2017 .  Click here to access the presentation given at these meetings.   Two additional meetings are scheduled for September of 2018.  These meetings will be:

Wednesday, September 26, 2018 at 7pm

Shearer Elementary, Multi-Purpose Room

1590 Elm Street, Napa, CA 94559


Thursday, September 27, 2018 at 7pm

Napa Valley Language Academy, Multi-Purpose Room

2700 Kilburn Avenue, Napa, CA 94558 



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