Public water system record
City of Imperial
Serves Imperial, Imperial County, CA · 21,591 people served
Federal records show 7 health-based violations and 4 monitoring/reporting issues for City of Imperial in the last ten years, including an unresolved LEAD AND COPPER RULE REVISIONS violation.
System profile
- Health-based violations, last 10 years
- 7
- Resolved
- 6
- Unresolved
- 1
- Any acute record
- No
- Monitoring issues, last 10 years
- 4
Key facts
- City of Imperial buys its water from Imperial Irrigation District.
- Highest measured level in the last 10 years: Total Trihalomethanes (TTHMs), 0.097 mg/L, federal limit 0.08 mg/L (1.2 times the limit), 2017.
- Most recent formal enforcement: compliance order (no penalty) by EPA, March 2026.
- Record on file since 2001, with 5 health-based violations before October 19, 2016.
Check whether City of Imperial 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.
| Contaminant | Rule family | Start date | Status | Acute |
|---|---|---|---|---|
|
LEAD AND COPPER RULE REVISIONS
Treatment technique failure
|
350 | Oct 17, 2024 |
Active
Enforcement action in place
|
No |
|
Surface Water Treatment Rule
Treatment technique failure
|
120 | May 1, 2018 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.095 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
220 | Oct 1, 2017 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.097 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
220 | Jul 1, 2017 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.089 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
220 | Apr 1, 2017 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.089 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
220 | Jan 1, 2017 | Resolved | No |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.093 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
220 | Oct 1, 2016 | Resolved | No |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
LEAD AND COPPER RULE REVISIONS
RPT
|
Oct 17, 2024 |
Active
Enforcement action in place
|
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2024 | Resolved |
|
Long Term 2 Enhanced Surface Water Treatment Rule
Monitoring and reporting
|
Jul 1, 2017 | Resolved |
|
Public Notice
OTHER
|
Oct 31, 2016 | Resolved |
Full record since 2001
EPA's records for City of Imperial go back to 2001. Before October 19, 2016 they list 5 health-based violations (5 resolved) and 4 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 2000s | 3 | 4 |
| 2010 to October 18, 2016 | 2 | 0 |
| October 19, 2016 to 2019 | 5 | 2 |
| 2020s | 1 | 2 |
Most recent health-based violation before October 19, 2016: Total Trihalomethanes (TTHMs), began October 2016, Resolved.
Show all 5 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.093 mg/L, federal limit 0.08 mg/L (1.2 times the limit)
|
Oct 1, 2016 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.086 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
Jul 1, 2016 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.082 mg/L, federal limit 0.08 mg/L (at or just above the limit)
|
Jul 1, 2009 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.088 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
Apr 1, 2009 | Resolved |
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 0.086 mg/L, federal limit 0.08 mg/L (1.1 times the limit)
|
Jan 1, 2009 | Resolved |
Enforcement actions
California regulators and EPA took 6 formal enforcement actions against City of Imperial between 2006 and 2026. The most recent was a compliance order (no penalty) in March 2026.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Mar 5, 2026 | EPA | Compliance order (no penalty) | 2 violations (1 health-based): LEAD AND COPPER RULE REVISIONS |
| Jul 22, 2024 | California | Compliance order (no penalty) | 1 violation: Consumer Confidence Rule |
| Aug 9, 2018 | California | Compliance order (no penalty) | 1 violation (1 health-based): Surface Water Treatment Rule |
| Nov 30, 2017 | California | Compliance order (no penalty) | 4 violations (4 health-based): Total Trihalomethanes (TTHMs) |
| Jan 10, 2017 | California | Compliance order (no penalty) | 3 violations (2 health-based): Total Trihalomethanes (TTHMs), Public Notice |
| Sep 27, 2006 | California | Compliance order (no penalty) | 2 violations: Haloacetic Acids (HAA5), Total Trihalomethanes (TTHMs) |
What the violations mean
Total Trihalomethanes (TTHMs)
5 incidentsDisinfection byproduct levels exceeded the federal limit
Long-term TTHM exposure may increase bladder cancer risk
LEAD AND COPPER RULE REVISIONS
1 incidentThe system did not complete a treatment step or action that the LEAD AND COPPER RULE REVISIONS requires (a treatment technique violation).
The utility had to notify customers about this violation.
Surface Water Treatment Rule
1 incidentThe system did not complete a treatment step or action that the Surface Water Treatment Rule requires (a treatment technique violation).
The utility had to notify customers about this violation.
Where the water comes from
City of Imperial buys its water from Imperial Irrigation District. It lists no wells or intakes of its own.
Buys water from
- Imperial Irrigation District Imperial, CA
Annual water quality report
City of Imperial 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