Ontario water and sewer rates
Who supplies water to Ontario houses, what it costs, and how the sewer charge works.
Ontario Municipal Utilities Company
Ontario Municipal Utilities Company bills monthly: a Readiness to Serve charge by meter size plus three tiers per HCF for single-family homes (1-10, 11-18 and over 18 HCF).
| Use a month | Price per unit (CCF, 748 gallons) |
|---|---|
| Fixed charge | $33.86 a month |
| 0 to 10 units | $2.61 |
| 10 to 18 units | $4.87 |
| 18 to more | $5.76 |
- Source
- Groundwater from City-owned wells and from San Antonio Water Company, Jurupa Community Services District and Chino Basin Desalter Authority wells, plus State Water Project water treated by the Water Facilities Authority.
- Violations
- OMUC reported no water quality violations during 2025.
- Lead pipes
- OMUC's 2024 lead service line inventory found no lead service lines in the system.
Sewer
Ontario bills single-family homes a flat monthly sewer charge per dwelling unit: the City charge ($15.36) plus IEUA's pass-through treatment charge ($29.45), from July 1, 2026.
Ways to pay less
- Seniors 65+ or disabled, low income: utility discount. Households with a member 65 or older or a disabled person, and gross household income at or below 200% of the federal poverty level, can get a monthly discount of up to $15 off the combined water, sewer and refuse bill. The discount is in effect for one year from approval; to renew it for another year you return a renewal application. How: Apply in person at the Utilities Customer Service Center, 1333 S. Bon View Avenue, with the required documents, including proof of income and proof of age or physician documentation. Questions: (909) 395-2050.
- Turf replacement rebate. Ontario's water Programs & Rebates page lists a turf replacement program at $2 per square foot, along with the Residential Irrigation System Enhancement (RISE) program and a water softener rebate. How: See Programs & Rebates on the City's Ontario Waterwise pages.
Pay or manage it
Sources
- City of Ontario: water and wastewater rates effective July 1, 2026
- City of Ontario: 2025 Prop 218 notice (water, sewer, solid waste rates)
- City of Ontario: water programs and rebates
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.