Simi ValleyWhat a house pays

Simi Valley water and sewer rates

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

Simi Valley / Waterworks District No. 8

City of Simi Valley / Waterworks District No. 8, billed every two months: a single-family service charge plus one rate per billing unit (748 gallons), effective January 1, 2026.

Use a monthPrice per unit (CCF, 748 gallons)
Fixed charge$38.11 a month
0 to more$6.57
Source
Calleguas Municipal Water District supplies about 99 percent of the District's drinking water, mainly State Water Project water; about 1 percent is groundwater from the Gillibrand basin.
Lead
In 2025, the 90th-percentile lead result in 30 tap samples was 0.00082 ppm and no site exceeded the action level; the service line inventory found no lead service lines.

Golden State Water Company, Simi Valley

Golden State Water Company, Simi Valley District (Schedule SI-1-R, residential): monthly service charge for a 5/8 x 3/4-inch meter plus three tiers per Ccf, effective January 1, 2026.

Use a monthPrice per unit (CCF, 748 gallons)
Fixed charge$40.09 a month
0 to 10 units$4.74
10 to 22 units$5.43
22 to more$6.22
Source
Treated surface water bought from Calleguas MWD (82%) is blended with groundwater from the Simi Valley basin (18%).
Hardness
Hardness averaged 12 grains per gallon in 2025 (range 8.0 to 19).
Lead
Golden State Water found no lead or galvanized service lines that require replacement; lead in the 2023 tap samples was not detected at the 90th percentile.

Sewer

Residential sewer service is assessed on the Ventura County tax roll; the single-family rate is $58.72 a month from July 1, 2026.

Ways to pay less

  • Water efficiency rebates (Waterworks District No. 8). District customers may be eligible for water efficiency rebates through the Metropolitan Water District's Residential Rebate Program. How: See the City's Water Conservation page for rebate details.

Pay or manage it

Sources

  1. City of Simi Valley: Waterworks Services (VCWWD No. 8)
  2. City of Simi Valley: Water rates and service fees (effective January 1, 2026)
  3. Waterworks District No. 8: CY 2026-2030 Water Rate Study (Bartle Wells, October 24, 2025)
  4. Waterworks District No. 8: 2025 Annual Water Quality Report
  5. Golden State Water: Schedule SI-1-R, Simi Valley residential metered service
  6. Golden State Water: Simi Valley rates
  7. Golden State Water: Simi Valley 2025 Consumer Confidence Report
  8. Ventura County Watershed Protection District: Report on Benefit Assessment Program
  9. Ventura County Public Works: Watershed Protection Benefit Assessment

Checked October 21, 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.