Service Area & Statistics 

The Napa Sanitation District serves residents and businesses in the City of Napa, Silverado Country Club, the Napa County Airport and several adjacent unincorporated areas.  Click here to view a map of the NSD service area.



Napa Sanitation District…by the Numbers  



Number of Service Connections


Population Served


Service Area Size

21 square miles

Sewer Mains

270 miles

Treatment Process

Secondary and Tertiary, biological/physical/chemical

Dry Weather Wastewater Treatment Capacity

15.4 million gallons/day (MGD)

Average Amount of Wastewater Treated Daily

10 MGD

Recycled Water Produced

650 million gallons annually

Biosolids Produced

1,200 dry tons annually