What's in ATOKA's water?
ATOKA had a health-based violation within the last five years. The required corrective action was reported, but it happened recently enough to matter. 2,988 people get their water from it, across 1,364 connections.
ATOKA's record against the rest of the country
119 total violations and 106 health-based ones put ATOKA at the 99th percentile nationally for violation burden, rank 70 of 12,903.
How ATOKA compares within OK
Among the 240 OK systems in this dataset, the average is 39.5 health-based violations - ATOKA's 106 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 ATOKA is from 2025-01-10 (health-based: 2025-01-10). Last reported to EPA: 05/13/2026.
What kind of problem, specifically
ATOKA'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); Interim Enhanced Surface Water Treatment Rule; Surface Water Treatment Rule
- Synthetic organic chemicals / pesticides / VOCs - flagged from: CARBON, TOTAL; Chlorine dioxide
- 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 ATOKA 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 - 106 health-based violations on file for ATOKA - 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.