Since it was founded in 1945, the Napa Sanitation District has helped to protect public health and the Napa River by providing wastewater collection, treatment and disposal, and pollution prevention programs. The District serves approximately 73,000 people in a 21 square mile area that comprises the City of Napa and surrounding unincorporated areas.

In order to perform this important community service, the District operates and maintains the facilities described in this section.

Wastewater Treatment Plant

 The District’s Soscol Water Recycling Facility treats an average of 10 million gallons per day (MGD) of wastewater.

Recycled Water

Some of the wastewater treated by the District is turned into recycled water, which can be safely reused to irrigate landscaping, parks, playing fields, pastureland and vineyards. The treatment plant produces an average of 612 million gallons of recycled water each year.

Water Quality Laboratory

The District operates a water quality laboratory that tests the wastewater at each step in the treatment process. In order to insure high water quality and protect the Napa River, the lab performs over 26,000 water quality tests every year!

Collection System

 The District maintains, cleans and repairs 270 miles of pipeline that collect wastewater from homes and businesses in Napa and carry it to the wastewater treatment plant. The collection system also includes three pump stations and a siphon that pulls wastewater through a pipeline under the Napa River.  

District Headquarters

The District’s headquarters house the Administration, Engineering and Collections System departments. Headquarters are located next to the Soscol Water Recycling Facility at 1515 Soscol Ferry Road, just south of the Southern Crossing on Hwy 29.