Atoka

Treatment Technique Violation, health-based: 1 violation, Oct 2024 to Aug 2025. The system did not carry out a required treatment process or corrective action.

What the rule requires: All systems using surface water (rivers, lakes, reservoirs) or groundwater under surface influence (GWUDI) must filter and disinfect. Treatment technique violations mean the system failed to maintain adequate disinfectant residual, exceeded turbidity limits, or lacked required permits. Snowmelt and storm events can raise turbidity and pathogen loads in surface water.

Health effects: Without proper filtration/disinfection: Giardia lamblia (severe diarrhea, cramping), Cryptosporidium (life-threatening for immunocompromised individuals), viruses (hepatitis A, norovirus). Turbidity itself is not a health risk but can shield pathogens from disinfection. Limit: Treatment technique: turbidity ≤0.3 NTU in 95% of monthly samples; detectable disinfectant residual in 95% of distribution samples

Treatment Technique Violation, health-based: 4 violations, Jul 2023 to Jun 2026. The system did not carry out a required treatment process or corrective action.

Monitoring and Reporting: 1 violation, Aug 2024 to Oct 2024. The system did not complete required monitoring, or did not report the results on time. This does not show that a contaminant was found.

Contaminants on the record: Chlorite, Carbon, Total.

Chlorite, health effects: Elevated chlorite in drinking water can cause hemolytic anemia by oxidizing red blood cell membranes. Infants, young children, pregnant women, and individuals with glucose-6-phosphate dehydrogenase (G6PD) deficiency are especially sensitive. Chronic low-level exposure may also affect the nervous system. Most violations reflect localized high levels at specific monitoring points. Limit: 1.0 mg/L (1,000 ppb)

Maximum Contaminant Level Violation, health-based: 16 violations, Oct 2023 to Jun 2026. A sample exceeded the maximum contaminant level EPA allows in drinking water.

Contaminants on the record: Total Haloacetic Acids (HAA5), TTHM (Total Trihalomethanes).

Total Haloacetic Acids (HAA5), health effects: Dichloroacetic acid is a probable human carcinogen (Group B2). Long-term exposure to trichloroacetic acid may also increase cancer risk. Animal studies show liver, kidney, and reproductive effects at high doses. Limit: 0.060 mg/L (60 ppb) locational running annual average (LRAA)

TTHM (Total Trihalomethanes), health effects: Long-term exposure is associated with increased bladder cancer risk. Some studies link high TTHM exposure to adverse reproductive outcomes. Bromodichloromethane is classified as a possible human carcinogen. Limit: 0.080 mg/L (80 ppb) locational running annual average (LRAA)