City of Vallejo-Lakes System, CA Water Quality
City of Vallejo-Lakes System: EPA violation history, explained
City of Vallejo-Lakes System has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. It serves 2,800 people through 860 service connections.
City of Vallejo-Lakes System's record against the rest of the country
3 total violations and 3 health-based ones put City of Vallejo-Lakes System at the 56th percentile nationally for violation burden, rank 5,623 of 12,903.
How City of Vallejo-Lakes System compares within CA
Among the 804 CA systems in this dataset, the average is 5.8 health-based violations - City of Vallejo-Lakes System's 3 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 City of Vallejo-Lakes System is from 2016-01-03 (health-based: 2016-01-03). Last reported to EPA: 06/22/2026.
What kind of problem, specifically
City of Vallejo-Lakes System'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); 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
City of Vallejo-Lakes System'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. This record - 3 health-based violations on file for City of Vallejo-Lakes System - 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.