JEFFERSON, CITY OF: EPA violation history, explained
JEFFERSON, CITY OF has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. 3,348 people get their water from it, across 1,150 connections.
JEFFERSON, CITY OF's record against the rest of the country
JEFFERSON, CITY OF has 46 violations on record in total, 1 of them health-based - ranking it 7,475th of 12,903 systems by violation count, the 42th percentile nationally.
Against the OR average
Among the 160 OR systems in this dataset, the average is 6.0 health-based violations - JEFFERSON, CITY OF's 1 is at or below that. See the lead and copper guide for why lead counts differently.
Most recent violation on record
JEFFERSON, CITY OF's most recent violation on record is dated 2025-01-03, with the most recent health-based one dated 1995-01-06. Last reported to EPA: 06/26/2026.
The concern categories on record
JEFFERSON, 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
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 JEFFERSON, CITY OF's record does not cover
This is what JEFFERSON, 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. Between the utility's meter and JEFFERSON, CITY OF's customers' taps is household plumbing, invisible to a system-level record ranked 7,475th of 12,903 by violation count. The guide to what this data misses covers that gap.