Pomona - City, Water Dept., CA Water Quality
What's in Pomona - City, Water Dept.'s water?
Pomona - City, Water Dept. has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. It serves 151,713 people through 30,172 service connections.
Pomona - City, Water Dept.'s record against the rest of the country
Out of 12,903 systems in this dataset, Pomona - City, Water Dept. ranks 9,070th by violation burden (30th percentile) - 2 violations total, 1 health-based.
How Pomona - City, Water Dept. compares within CA
Among the 804 CA systems in this dataset, the average is 5.8 health-based violations - Pomona - City, Water Dept.'s 1 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 Pomona - City, Water Dept. is from 1993-01-06 (health-based: 1993-01-06). Last reported to EPA: 06/22/2026.
What kind of problem, specifically
Pomona - City, Water Dept.'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: Surface Water Treatment Rule
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
Everything on this page is Pomona - City, Water Dept.'s own reported record under the Safe Drinking Water Act - a regulatory filing, not a sample of your tap. This record - 1 health-based violation on file for Pomona - City, Water Dept. - stops at the meter and cannot see household plumbing on the other side of it. The guide to what this data misses covers that gap.