CALIFORNIA WATER SERVICE CO. - DOMINGUEZ: EPA violation history, explained
CALIFORNIA WATER SERVICE CO. - DOMINGUEZ has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. It serves 143,996 people through 33,150 service connections.
CALIFORNIA WATER SERVICE CO. - DOMINGUEZ's record against the rest of the country
CALIFORNIA WATER SERVICE CO. - DOMINGUEZ has 8 violations on record in total, 1 of them health-based - ranking it 8,344th of 12,903 systems by violation count, the 35th percentile nationally.
How CALIFORNIA WATER SERVICE CO. - DOMINGUEZ compares within CA
CA's 803 covered systems average 5.8 health-based violations each; CALIFORNIA WATER SERVICE CO. - DOMINGUEZ carries 1, not more than typical for the state. The filter guide explains what a violation like this actually calls for.
Most recent violation on record
The last violation EPA has on record for CALIFORNIA WATER SERVICE CO. - DOMINGUEZ is from 2018-01-04 (health-based: 1995-01-10). Last reported to EPA: 06/22/2026.
What kind of problem, specifically
CALIFORNIA WATER SERVICE CO. - DOMINGUEZ's flagged contaminants and rule violations, grouped by what they actually mean for a filter choice rather than left as EPA's raw code list:
- Microbial contamination / treatment technique - flagged from: Coliform (TCR)
The most severe category on record is microbial contamination / treatment technique, which points toward a microbial-class filter if you want to address it directly.
What this data is and is not
This is what CALIFORNIA WATER SERVICE CO. - DOMINGUEZ reported to its state primacy agency and EPA under the Safe Drinking Water Act - real regulatory record, not a lab test of your specific tap. Water quality can still change between the meter and the faucet - household plumbing sits outside what a record of 8 logged violations can see. The guide to what this data misses covers that gap.