Rohnert ParkWhat a house pays

Rohnert Park water and sewer rates

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

City of Rohnert Park

City of Rohnert Park water rates effective July 1, 2026 (Resolution 2025-090), billed monthly: a $42.62 fixed monthly service charge for a meter up to 1 inch plus, for single-family homes, $0.005136 per gallon for the first 3,000 gallons a month and $0.007106 per gallon above 3,000 gallons

Use a monthPrice per 1,000 gallons
Fixed charge$42.62 a month
0 to 3 thousand gallons$5.14
3 to more$7.11
Source
The City delivers treated water produced by Sonoma Water (about 60 percent), from six Ranney collectors along the Russian River and three wells near the Cotati Aqueduct, blended with water from the City's own groundwater wells (about 40 percent).
Hardness
Total hardness in 2025 averaged 229.67 ppm in the City's water (range 193 to 257) and 92.3 ppm in Sonoma Water's supply.
Lead
In the 2025 tap sampling, the 90th percentile lead level was ND (not detected) and 0 of 30 sites were above the lead action level. The City's service line inventory found no lead service lines.
PFAS
In 2025, PFOA was detected in Sonoma Water's supply at an average of 0.19 ppt (range ND to 1.1); no result is listed for the City's own water (NA).

Sewer

The City of Rohnert Park bills sewer monthly with water. From July 1, 2026 a home pays a $19.96 monthly base charge plus $14.52 per thousand gallons, billed on the household's winter average (sewer cap) or on actual use when that is lower. The City lists typical winter averages by household size: 2,000 gallons a month for 1 person up to 12,000 for 6; 6,000 for a household of 3.

Ways to pay less

  • Cash 4 Grass: $1 per square foot of lawn replaced. Owners of residential property who are City water customers can get $1 per square foot of turf replaced with low-water plants on drip irrigation. The lawn must be green and maintained at the pre-inspection, and lawns replaced with a pool, hardscape or non-drought-tolerant landscaping do not qualify. Available while funding lasts. How: Call the Environmental and Sustainability Manager at (707) 588-3302 for a pre-inspection before you start; finish within 120 days of approval.

Sources

  1. City of Rohnert Park: water rates (effective July 1, 2026)
  2. City of Rohnert Park: water & sewer rate updates
  3. City of Rohnert Park: sewer rates (effective July 1, 2026)
  4. City of Rohnert Park: water Prop 218 notice (Sept. 23, 2025)
  5. City of Rohnert Park 2025 Water Rate Study Report
  6. City of Rohnert Park 2025 Water Quality Report
  7. City of Rohnert Park: water conservation and rebates
  8. EPA water system boundaries (Rohnert Park)

Checked October 22, 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.