Is CAL-WATER SERVICE CO.-CHICO's water safe to drink?
CAL-WATER SERVICE CO.-CHICO has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. It serves 114,925 people through 30,396 service connections.
Ranked against every other system in this dataset
6 total violations and 5 health-based ones put CAL-WATER SERVICE CO.-CHICO at the 70th percentile nationally for violation burden, rank 3,828 of 12,903.
How CAL-WATER SERVICE CO.-CHICO compares within CA
Among the 803 CA systems in this dataset, the average is 5.8 health-based violations - CAL-WATER SERVICE CO.-CHICO's 5 is at or below that. 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-WATER SERVICE CO.-CHICO is from 2002-01-09 (health-based: 2002-01-09). Last reported to EPA: 06/22/2026.
What kind of problem, specifically
CAL-WATER SERVICE CO.-CHICO'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)
- Synthetic organic chemicals / pesticides / VOCs - flagged from: Tetrachloroethylene
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
CAL-WATER SERVICE CO.-CHICO's numbers here come from its own required reporting to EPA under the Safe Drinking Water Act, not from an independent test of your glass of water. Between the utility's meter and CAL-WATER SERVICE CO.-CHICO's customers' taps is household plumbing, invisible to a system-level record ranked 3,828th of 12,903 by violation count. The guide to what this data misses covers that gap.