F19/100
COALINGA-CITY — Water Quality Report 2026
Serving 17,277 people · California
Water Source
Surface Water
County
—
System ID
CA1010004
Violations
17
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.43 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2016.
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Frequently Asked Questions About COALINGA-CITY
Is COALINGA-CITY water safe to drink?
COALINGA-CITY water receives a grade of F (19/100), which is considered failing. 1 contaminant(s) exceed EPA legal limits and 17 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has COALINGA-CITY detected?
70 contaminants were tested in COALINGA-CITY's water. Notable contaminants include Copper (90th percentile). 1 exceed EPA legal limits (MCLs). 1 exceed EPA health goals (MCLGs).
Does COALINGA-CITY have any EPA violations?
Yes, COALINGA-CITY has 17 EPA violation(s) on record, with the most recent in 2016. Violation types include Other, MCL, MR. 14 are health-based violations.
How many people does COALINGA-CITY serve?
COALINGA-CITY serves approximately 17,277 people, California. The system provides water to 1 community: Coalinga.
What type of water does COALINGA-CITY provide?
COALINGA-CITY sources its water from surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is CA1010004.
How does COALINGA-CITY compare to other utilities in California?
COALINGA-CITY scores 19/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our California state page for a full comparison of water systems.