What's in CAL AMERICAN WATER CO's water?
CAL AMERICAN WATER CO has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. It serves 66,809 people through 20,251 service connections.
Ranked against every other system in this dataset
CAL AMERICAN WATER CO has 3 violations on record in total, 1 of them health-based - ranking it 8,935th of 12,903 systems by violation count, the 31th percentile nationally.
How CAL AMERICAN WATER CO compares within CA
CAL AMERICAN WATER CO's 1 health-based violations sit within the CA average of 5.8, across 803 systems statewide. See the lead and copper guide for why lead counts differently.
Most recent violation on record
The last violation EPA has on record for CAL AMERICAN WATER CO is from 2022-01-10 (health-based: 1997-01-11). Last reported to EPA: 06/22/2026.
What kind of problem, specifically
CAL AMERICAN WATER CO'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 CAL AMERICAN WATER CO 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. Between the utility's meter and CAL AMERICAN WATER CO's customers' taps is household plumbing, invisible to a system-level record ranked 8,935th of 12,903 by violation count. The guide to what this data misses covers that gap.