SonomaHome costs

Sonoma water and sewer rates

At typical use (9 units, about 6,700 gallons a month), a Sonoma house pays about $97 a month for water: about $1,170 a year. Sewer is billed on the property tax bill instead. Estimated from public rates, not anyone's actual bill.

Who supplies water to Sonoma houses, what it costs, and how the sewer charge works.

Pay or manage it

City of Sonoma

City of Sonoma water rates effective July 1, 2026 (Zone 1): a $38.62 monthly service charge for a 5/8-inch meter, plus $7.11 per unit (1 unit = 1,000 gallons) for the first 2 units, $9.35 for 3 to 7 units and $11.43 for 8 or more units

Use a monthPrice per 1,000 gallons
Fixed charge$38.62 a month
0 to 2 thousand gallons$7.11
2 to 7 thousand gallons$9.35
7 to more$11.43
Source
The city's primary source is water purchased from Sonoma Water; its secondary source is six city-owned groundwater wells.

Sewer

Sonoma Valley County Sanitation District charges residential users with a public water connection a fixed charge of $1,056.71 per ESD per year from July 1, 2026, plus $8.56 per thousand gallons of lowest winter water use (12 billing periods a year for City of Sonoma Water District customers). The charges are collected on the Sonoma County tax roll.

How Sonoma compares with nearby cities

Water, a month

  1. Petaluma · 10 mi$70
  2. Vallejo · 17 mi$76
  3. Rohnert Park · 14 mi$81
  4. Napa · 9 mi$84
  5. Novato · 15 mi$87
  6. Sonoma$97

Water only, at each city's typical use; sewer is left out because some cities bill it on the tax bill.

Sources

  1. storage.googleapis.com 891fda9f-water-rates-fy-26-27.pdf
  2. www.sonomawater.org fy27ordinancesonomavalleycsd.pdf

Checked October 29, 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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