Cal-Water Service Co.-Willows, CA Water Quality
Is Cal-Water Service Co.-Willows's water safe to drink?
Cal-Water Service Co.-Willows has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. 7,240 people get their water from it, across 2,371 connections.
How this compares nationally
Out of 12,903 systems in this dataset, Cal-Water Service Co.-Willows ranks 7,058th by violation burden (45th percentile) - 2 violations total, 2 health-based.
Against the CA average
Among the 804 CA systems in this dataset, the average is 5.8 health-based violations - Cal-Water Service Co.-Willows's 2 is at or below that. The clean-record guide covers what a comparison like this can hide.
Most recent violation on record
Cal-Water Service Co.-Willows's most recent violation on record is dated 1996-01-10, with the most recent health-based one dated 1996-01-10. Last reported to EPA: 06/22/2026.
The concern categories on record
Cal-Water Service Co.-Willows'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 Cal-Water Service Co.-Willows's record does not cover
This is what Cal-Water Service Co.-Willows 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.