CAL-WATER SERVICE CO.-OROVILLE: EPA violation history, explained
CAL-WATER SERVICE CO.-OROVILLE has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. 11,106 people get their water from it, across 3,528 connections.
CAL-WATER SERVICE CO.-OROVILLE's record against the rest of the country
CAL-WATER SERVICE CO.-OROVILLE has 2 violations on record in total, 1 of them health-based - ranking it 9,112th of 12,903 systems by violation count, the 29th percentile nationally.
How CAL-WATER SERVICE CO.-OROVILLE compares within CA
CA's 803 covered systems average 5.8 health-based violations each; CAL-WATER SERVICE CO.-OROVILLE carries 1, not more than typical for the state. 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.-OROVILLE is from 2022-01-01 (health-based: 1996-01-06). Last reported to EPA: 06/22/2026.
What kind of problem, specifically
CAL-WATER SERVICE CO.-OROVILLE'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-WATER SERVICE CO.-OROVILLE 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 2 logged violations can see. The guide to what this data misses covers that gap.