HENNESSEY: EPA violation history, explained
HENNESSEY had a health-based violation within the last five years. The required corrective action was reported, but it happened recently enough to matter. 2,058 people get their water from it, across 1,155 connections.
Ranked against every other system in this dataset
92 total violations and 70 health-based ones put HENNESSEY at the 99th percentile nationally for violation burden, rank 151 of 12,903.
How HENNESSEY compares within OK
HENNESSEY's 70 health-based violations sit above the OK average of 39.5, across 240 systems statewide. The clean-record guide covers what a comparison like this can hide.
Most recent violation on record
The last violation EPA has on record for HENNESSEY is from 2022-01-01 (health-based: 2022-01-01). Last reported to EPA: 05/13/2026.
What kind of problem, specifically
HENNESSEY'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)
- Nitrate / nitrite - flagged from: Nitrate; Nitrate-Nitrite
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 HENNESSEY's own reported record under the Safe Drinking Water Act - a regulatory filing, not a sample of your tap. Water quality can still change between the meter and the faucet - household plumbing sits outside what a record of 92 logged violations can see. The guide to what this data misses covers that gap.