Is NAPA, CITY OF's water safe to drink?
NAPA, CITY OF has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. It serves 84,804 people through 25,376 service connections.
Ranked against every other system in this dataset
Out of 12,903 systems in this dataset, NAPA, CITY OF ranks 2,848th by violation burden (78th percentile) - 10 violations total, 7 health-baseds.
How NAPA, CITY OF compares within CA
Among the 803 CA systems in this dataset, the average is 5.8 health-based violations - NAPA, CITY OF's 7 is above that. The filter guide explains what a violation like this actually calls for.
Most recent violation on record
The last violation EPA has on record for NAPA, CITY OF is from 2016-01-01 (health-based: 2016-01-01). Last reported to EPA: 06/22/2026.
What kind of problem, specifically
NAPA, CITY OF'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
- Disinfection byproducts - flagged from: TTHM; Total Haloacetic Acids (HAA5)
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 NAPA, CITY OF 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. This record - 7 health-based violations on file for NAPA, CITY OF - 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.