Is Atoka Co. Rws & Swmd #4 Tap Water Safe? Quality Report

Water source: Surface water
Ownership: Local government
Counties served: Atoka

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

728

health-based violations

915

violations on file

still open

Violation	Type	Status	Period
TT	Health-based	Archived	2025-10-01 → 2025-12-31
TT	Health-based	Archived	2025-10-01 → 2025-12-31
TT	Health-based	Archived	2025-10-01 → 2025-12-31
MCL	Health-based	Archived	2025-10-01 → 2025-12-31
MCL	Health-based	Archived	2025-10-01 → 2025-12-31
MCL	Health-based	Archived	2025-10-01 → 2025-12-31
MCL	Health-based	Archived	2025-10-01 → 2025-12-31
MCL	Health-based	Archived	2025-10-01 → 2025-12-31
MCL	Health-based	Archived	2025-10-01 → 2025-12-31
MCL	Health-based	Archived	2025-07-01 → 2025-09-30

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.

Contaminant	Level vs EPA limit	Detection rate	Source	Period
Chlorite	125 µg/L 13% of the EPA limit 1000 µg/L worst single sample: 151 µg/L	65/77	SYR4	2017–2019
Copper	365 µg/L 28% of the EPA limit 1300 µg/L worst single sample: 615 µg/L	52/70	SYR4	2012–2019
Chloroform	208 µg/L No EPA limit set worst single sample: 239 µg/L	51/59	SYR4	2012–2019
TTHM	214.82 µg/L 269% of the EPA limit, at the 95th percentile of samples — 80 µg/L worst single sample: 247.65 µg/L	51/59	SYR4	2012–2019
Dichloroacetic Acid	90.41 µg/L No EPA limit set worst single sample: 102 µg/L	50/59	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	197.92 µg/L 330% of the EPA limit, at the 95th percentile of samples — 60 µg/L worst single sample: 235.83 µg/L	49/59	SYR4	2012–2019
Bromodichloromethane	12.74 µg/L No EPA limit set worst single sample: 32.3 µg/L	47/59	SYR4	2012–2019
Trichloroacetic Acid	115.1 µg/L No EPA limit set worst single sample: 125 µg/L	32/59	SYR4	2012–2019
Lead	0.0011 mg/L 7.5% of the EPA limit 0.0150 mg/L	17/17	LCR	2024
Monochloroacetic Acid	9.026 µg/L No EPA limit set worst single sample: 9.81 µg/L	17/59	SYR4	2012–2019
Nitrate-Nitrite	520 µg/L 5.2% of the EPA limit 10000 µg/L	14/18	SYR4	2012–2019
Dibromochloromethane	2.133 µg/L No EPA limit set worst single sample: 2.34 µg/L	10/59	SYR4	2012–2019
Lead	11.7 µg/L 78% of the EPA limit 15 µg/L worst single sample: 12.2 µg/L	6/70	SYR4	2012–2019
Bromoform	1.0055 µg/L No EPA limit set worst single sample: 1.03 µg/L	2/59	SYR4	2012–2019
Monobromoacetic Acid	2.577 µg/L No EPA limit set worst single sample: 2.63 µg/L	2/59	SYR4	2012–2019
P-Dichlorobenzene	4.554 µg/L 6.1% of the EPA limit 75 µg/L worst single sample: 4.69 µg/L	2/14	SYR4	2012–2019
Barium	12.8 µg/L 0.6% of the EPA limit 2000 µg/L	1/1	SYR4	2013
Combined Radium (-226 And -228)	0.8090 pCi/L 16% of the EPA limit 5 pCi/L	1/2	SYR4	2013–2019

33 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-DichloropropaneAntimony, TotalArsenicBenzeneBeryllium, TotalChlorobenzeneCadmiumCarbon TetrachlorideChromiumCombined UraniumDichloromethaneDibromoacetic AcidEthylbenzeneFluorideGross Alpha, Excl. Radon And UGross Beta Particle ActivityMercurySeleniumStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: ATOKA CO RWS & SWMD #4
Phone: 580-889-5715
Email: nicole@atokarwd4.com

Frequently asked questions about Atoka Co. Rws & Swmd #4

Is Atoka Co. Rws & Swmd #4 tap water safe to drink?

EPA monitoring detected 18 contaminants in Atoka Co. Rws & Swmd #4's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Atoka Co. Rws & Swmd #4's water?

EPA monitoring detected Chlorite, Copper, Chloroform, TTHM, Dichloroacetic Acid, and others. The full list with the level and data source for each is above.

How many people does Atoka Co. Rws & Swmd #4 serve?

Atoka Co. Rws & Swmd #4 reports serving 3,000 people in Oklahoma, per its EPA record.

Has Atoka Co. Rws & Swmd #4 had any water quality violations?

The EPA has 915 violations on file for Atoka Co. Rws & Swmd #4, of which 728 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.