A86/100
CALIFORNIA WATER SERVICE CO. - DOMINGUEZ — Water Quality Report 2026
Serving 143,996 people · California
Water Source
Purchased Surface Water
County
—
System ID
CA1910033
Violations
7
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2018.
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 CALIFORNIA WATER SERVICE CO. - DOMINGUEZ
Is CALIFORNIA WATER SERVICE CO. - DOMINGUEZ water safe to drink?
CALIFORNIA WATER SERVICE CO. - DOMINGUEZ water receives a grade of A (86/100), which is considered excellent. Out of 76 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has CALIFORNIA WATER SERVICE CO. - DOMINGUEZ detected?
76 contaminants were tested in CALIFORNIA WATER SERVICE CO. - DOMINGUEZ's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does CALIFORNIA WATER SERVICE CO. - DOMINGUEZ have any EPA violations?
Yes, CALIFORNIA WATER SERVICE CO. - DOMINGUEZ has 7 EPA violation(s) on record, with the most recent in 2018. Violation types include MR, MCL. 1 are health-based violations.
How many people does CALIFORNIA WATER SERVICE CO. - DOMINGUEZ serve?
CALIFORNIA WATER SERVICE CO. - DOMINGUEZ serves approximately 143,996 people, California.
What type of water does CALIFORNIA WATER SERVICE CO. - DOMINGUEZ provide?
CALIFORNIA WATER SERVICE CO. - DOMINGUEZ sources its water from purchased surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is CA1910033.
How does CALIFORNIA WATER SERVICE CO. - DOMINGUEZ compare to other utilities in California?
CALIFORNIA WATER SERVICE CO. - DOMINGUEZ scores 86/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our California state page for a full comparison of water systems.