Napa water and sewer rates
At typical use (9 units, about 6,700 gallons a month), a Napa house pays about $84 a month for water: about $1,000 a year. Sewer is billed on the property tax bill instead. Estimated from public rates, not anyone's actual bill.
Who supplies water to Napa houses, what it costs, and how the sewer charge works.
Pay or manage it
City of Napa Water Division
City of Napa rates from October 1, 2026, billed bimonthly: bimonthly fixed service charge $69.25 for a 3/4-inch or 1-inch meter and single-family inside-city tiers of $7.27 (0-14 units), $10.71 (15-27 units) and $13.00 (28+ units) per 1,000 gallons.
| Use a month | Price per 1,000 gallons |
|---|---|
| Fixed charge | $34.63 a month |
| 0 to 7 thousand gallons | $7.27 |
| 7 to 13.5 thousand gallons | $10.71 |
| 13.5 to more | $13.00 |
- Source
- The City of Napa supplies water from three surface water sources: the State Water Project (via the North Bay Aqueduct), Lake Hennessey and Milliken Reservoir.
- Lead
- The City has determined it has no lead service lines in its distribution system.
Sewer
Napa Sanitation District sewer service charge for a single family dwelling, fiscal year 2026/2027 (July 1 through June 30).
How Napa compares with nearby cities
Water, a month
- Fairfield · 15 mi$60
- Suisun City · 16 mi$73
- Vallejo · 13 mi$76
- Napa$84
- Benicia · 17 mi$91
- Sonoma · 9 mi$97
Water only, at each city's typical use; sewer is left out because some cities bill it on the tax bill.
Ways to pay less
- Single-family water customers: RateShare Discount. Eligible low-income single-family residential customers pay slightly lower rates through the Water RateShare Discount Program; enrolled single-family customers have $25 subtracted from the bimonthly bill. How: See the City of Napa Water RateShare Discount Program.
Sources
Checked October 28, 2026. Every number here comes from the public sources listed, matched by our checker.
Rates change every year; this page shows when it was last checked. Nothing here is legal, tax or insurance advice.
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