About Us

Service Area & Statistics

NapaSan serves residents and businesses in the City of Napa, Silverado Country Club, the Napa County Airport, and several adjacent unincorporated areas. View a map of the NapaSan service area (PDF).

Team member cleaning sewer lines

NapaSan by the Numbers

Amount or Type
Average Amount of Wastewater Treated Daily
8 million gallons per day (MGD)
Biosolids Produced
1,200 dry tons annually
Dry Weather Wastewater Treatment Capacity
15.4 MGD
Number of Service Connections
Population Served
Recycled Water Produced
700 million to over 1 billion gallons annually
Sewer Service Area Size
21 square miles
Sewer Mains
274 miles
Treatment Process
Secondary and Tertiary, biological / physical / chemical