Ontario Municipal Utilities Company – Domestic Water Division
City of Ontario municipal water service area in San Bernardino County
Population reference
185,010 people served by active CWS PWS CA3610034 in the California SDWIS registry, with approximately 35,167 residential, 4,493 commercial, and 336 industrial metered service records.
Billing detail
Broad public detail found
Official destination
Open provider website ↗Provider-specific findings
Billing and account research from public material
Provider-specific research notes are displayed separately from fields that contain only an unavailable-information marker. Read qualifiers in each note and verify current account terms with the provider.
- Billing frequency
- Monthly water and wastewater rate structure. Ontario’s July 1, 2026 rate sheet labels residential potable-water use, readiness-to-serve, and wastewater charges as monthly. The City’s unified utility bill can combine water, sewer, refuse, and storm-water-related services.
- Rate structure
- Metered increasing-block residential potable-water rates with a monthly readiness-to-serve charge by meter size. Effective July 1, 2026, residential potable water is $2.61/HCF for 1–10 HCF, $4.87/HCF for 11–18 HCF, and $5.76/HCF over 18 HCF; one HCF equals 748 gallons. The 5/8-inch monthly RTS charge is $12.80, with larger meter sizes charged more. Non-single-family, recycled-water, fire-service, and other categories use separate schedules.
- Residential cost reference
- A 5/8-inch single-family customer using 5,000–7,000 gallons per month consumes approximately 6.7–9.4 HCF, remaining in the first residential tier. At $2.61/HCF plus the $12.80 monthly 5/8-inch RTS charge, water alone is approximately $30.24–$37.23 per month. Ontario’s July 2026 wastewater sheet also lists a single-family monthly sewer structure with City and Inland Empire Utilities Agency components, so a combined water-and-sewer estimate is roughly $75–$85 per month before integrated waste, taxes, or other municipal charges; the exact sewer amount depends on the current EDU and IEUA factors.
- Wastewater and sewer calculation
- Ontario bills sewer on the unified utility account. The July 1, 2026 rate sheet describes residential wastewater as a monthly single-family-per-dwelling-unit base/City charge plus an Inland Empire Utilities Agency charge; non-residential wastewater uses an equivalent-dwelling-unit calculation, expressed as HCFs multiplied by a sewer factor, with the sheet showing an EDU-based charge and a $1.62/HCF component. The City does not publish a residential winter-average formula in the reviewed sheet; wastewater is a separate service-cost schedule rather than a fixed percentage of potable intake.
- Meter reading
- Ontario operates more than 630 miles of potable-water lines and serves more than 45,000 water connections. The City has a Customer Service & Meter Reading operational function and uses metered monthly potable-water rates. A 2025 City fiber plan identifies Automatic Meter Reading (AMR) for water services as a planned/possible municipal network application, but the reviewed 2026 customer pages do not identify a universal AMR/AMI vendor, deployment percentage, or transmission interval. The defensible description is routine municipal meter reading with monthly billing and customer-service investigation of leaks and meter issues.
- New-account deposit
- Ontario requires an advance payment before service begins. The current Municipal Code states that the advance payment equals twice the estimated monthly bill for water, refuse, and wastewater services, with a minimum of $80. New service generally requires application at least one business day before the desired start date, government identification, Social Security number, ownership or landlord authorization documentation, and payment of the advance. The code does not state a routine credit-check waiver or an automatic refund date in the reviewed section; confirm the account-specific crediting rules with Customer Service.
- Activation or transfer fee
- No charge is made for a customer-requested water turn-off or turn-on for closing an old account or beginning a new one. New service requires at least one business day’s advance application and payment of the required advance payment. Delinquent restoration, same-day requests, meter work, fire-hydrant service, and other field services carry separate current rate-sheet charges; confirm a transfer or after-hours amount with 909-395-2050.
Context, not a score
How documentation coverage compares
This profile
100%
overview fields with research notes
California
67%
records with any overview detail
National index
50%
records with any overview detail
Coverage measures what this directory documented. It does not measure service quality, affordability, or regulatory compliance.
Research record
Broad public detail found
7 of 7 fields in this section contain provider-specific public detail in dataset August 1, 2026.
Documented
100%
Primary verification routes
- Ontario Municipal Utilities Company – Domestic Water Division public website ↗
Provider-controlled destination used to confirm current customer instructions.
- csd.ca.gov reference ↗
Public URL preserved in the compiled record. Confirm its publisher, date, and applicability before relying on it.
- EPA SDWIS / ECHO lookup (CA3610034) ↗
Search the federal drinking-water database using public water system ID CA3610034.