Public water system record
Ontario Municipal Utilities Company
Serves Ontario, San Bernardino County, CA · 185,010 people served
Federal records show no health-based violations and no monitoring or reporting issues for Ontario Municipal Utilities Company in the last ten years.
System profile
- Health-based violations, last 10 years
- 0
- Resolved
- 0
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 0
Key facts
- Ontario Municipal Utilities Company draws water from 18 wells.
- Most recent formal enforcement: signed compliance agreement by California, May 1994.
- Record on file since 1993, with 1 health-based violation before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 39,390 service lines.
Check whether Ontario Municipal Utilities Company serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
None since October 2016, and no monitoring or reporting violations either.
Full record since 1993
EPA's records for Ontario Municipal Utilities Company go back to 1993. Before October 19, 2016 they list 1 health-based violation (1 resolved) and no monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 1 | 0 |
Most recent health-based violation before October 19, 2016: Surface Water Treatment Rule, began June 1993, Resolved.
Show the health-based violation before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Surface Water Treatment Rule
Treatment technique failure
|
Jun 1, 1993 | Resolved |
Enforcement actions
California regulators took 2 formal enforcement actions against Ontario Municipal Utilities Company between 1993 and 1994. The most recent was a signed compliance agreement in May 1994.
| Date | By | Action | Violations covered |
|---|---|---|---|
| May 16, 1994 | California | Signed compliance agreement | 1 violation (1 health-based): Surface Water Treatment Rule |
| Jul 19, 1993 | California | Compliance order (no penalty) | 1 violation (1 health-based): Surface Water Treatment Rule |
Where the water comes from
Ontario Municipal Utilities Company draws water from 18 wells. It also buys water from Chino Basin Desalter Auth. - Desalter 2, Jurupa Community SD and Water Facilities Authority-Jpa. It also has emergency connections to City of Chino and Cucamonga Valley Water District. 1 other public water system has an emergency connection to Ontario Municipal Utilities Company.
Buys water from
- Chino Basin Desalter Auth. - Desalter 2 Ontario, CA
- Jurupa Community SD Jurupa Valley, CA
- Water Facilities Authority-Jpa Upland, CA
Emergency or part-time connections to
- City of Chino Chino, CA
- Cucamonga Valley Water District Rancho Cucamonga, CA
Annual water quality report
Ontario Municipal Utilities Company must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Systems serving 10,000 or more people must mail or deliver the report to every customer, and from 2027 they must send it twice a year.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by California.
Certified drinking water labs by state EPA guidance for private wells