Public water system record
City of Ontario
Serves Ontario, Malheur County, OR · 14,465 people served
Federal records show no health-based violations and 7 monitoring/reporting issues for City of Ontario 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
- 7
Key facts
- City of Ontario draws water from 6 wells and 1 surface water intake.
- Record on file since 1976, with 1 health-based violation before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 4,230 service lines.
Check whether City of Ontario 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.
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Mar 1, 2023 | Resolved |
|
Interim Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Mar 1, 2023 | Resolved |
|
Surface Water Treatment Rule
Monitoring and reporting
|
Mar 1, 2023 | Resolved |
|
Surface Water Treatment Rule
Monitoring and reporting
|
Mar 1, 2023 | Resolved |
|
Surface Water Treatment Rule
Monitoring and reporting
|
Mar 1, 2023 | Resolved |
|
Surface Water Treatment Rule
Monitoring and reporting
|
Mar 1, 2023 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Jan 1, 2023 | Resolved |
Full record since 1976
EPA's records for City of Ontario go back to 1976. Before October 19, 2016 they list 1 health-based violation (1 resolved) and 93 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1970s | 0 | 2 |
| 1990s | 0 | 13 |
| 2000s | 1 | 59 |
| 2010 to October 18, 2016 | 0 | 19 |
| 2020s | 0 | 7 |
Most recent health-based violation before October 19, 2016: Surface Water Treatment Rule, began March 2002, Resolved.
Show the health-based violation before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Surface Water Treatment Rule
Treatment technique failure
|
Mar 1, 2002 | Resolved |
Where the water comes from
City of Ontario draws water from 6 wells and 1 surface water intake.
Annual water quality report
City of Ontario 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 Oregon.
Certified drinking water labs by state EPA guidance for private wells