Is Shawnee Municipal Authority Tap Water Safe? Quality Report

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

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.

303

health-based violations

342

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
TT	Health-based	Archived	2025-07-01 → 2025-09-30
TT	Health-based	Archived	2025-07-01 → 2025-09-30
TT	Health-based	Archived	2025-07-01 → 2025-09-30
TT	Health-based	Archived	2025-04-01 → 2025-06-30
TT	Health-based	Archived	2025-04-01 → 2025-06-30
TT	Health-based	Archived	2025-04-01 → 2025-06-30
TT	Health-based	Archived	2025-01-01 → 2025-03-31

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).

Contaminant	Max	Detection rate	Period
Pfba	0.0079 µg/L	4/4	2024
Pfpea	0.0032 µg/L	1/4	2024

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
TTHM	47.965 µg/L 60% of the EPA limit 80 µg/L worst single sample: 62 µg/L	128/128	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	37.4 µg/L 62% of the EPA limit 60 µg/L worst single sample: 56.3 µg/L	126/128	SYR4	2012–2019
Bromodichloromethane	17.215 µg/L No EPA limit set worst single sample: 22.4 µg/L	118/118	SYR4	2012–2019
Dibromochloromethane	14.2 µg/L No EPA limit set worst single sample: 17.4 µg/L	118/118	SYR4	2012–2019
Chloroform	21.85 µg/L No EPA limit set worst single sample: 42.7 µg/L	116/118	SYR4	2012–2019
Dichloroacetic Acid	25.705 µg/L No EPA limit set worst single sample: 28.1 µg/L	114/116	SYR4	2012–2019
Chlorite	953.5 µg/L 95% of the EPA limit 1000 µg/L worst single sample: 981 µg/L	112/114	SYR4	2012–2019
Dibromoacetic Acid	6.67 µg/L No EPA limit set worst single sample: 8.11 µg/L	111/116	SYR4	2012–2019
Trichloroacetic Acid	8.71 µg/L No EPA limit set worst single sample: 25.4 µg/L	96/116	SYR4	2012–2019
Bromoform	7.8995 µg/L No EPA limit set worst single sample: 10.3 µg/L	90/118	SYR4	2012–2019
Copper	326.55 µg/L 25% of the EPA limit 1300 µg/L worst single sample: 638 µg/L	72/90	SYR4	2012–2017
Monochloroacetic Acid	5.404 µg/L No EPA limit set worst single sample: 6.06 µg/L	22/116	SYR4	2012–2019
Lead	0.0028 mg/L 19% of the EPA limit 0.0150 mg/L	14/14	LCR	2023
Nitrate-Nitrite	1320 µg/L 13% of the EPA limit 10000 µg/L	14/22	SYR4	2012–2019
Lead	24.02 µg/L 160% of the EPA limit, at the 95th percentile of samples — 15 µg/L worst single sample: 25 µg/L	8/90	SYR4	2012–2017
Monobromoacetic Acid	1.705 µg/L No EPA limit set worst single sample: 1.76 µg/L	6/116	SYR4	2012–2019
Gross Beta Particle Activity	5.163 pCi/L No EPA limit set worst single sample: 5.2 pCi/L	2/2	SYR4	2013–2014
Barium	144 µg/L 7.2% of the EPA limit 2000 µg/L	1/1	SYR4	2012
Combined Radium (-226 And -228)	0.3200 pCi/L 6.4% of the EPA limit 5 pCi/L	1/2	SYR4	2013–2014
Gross Alpha, Excl. Radon And U	1.66 pCi/L 11% of the EPA limit 15 pCi/L	1/2	SYR4	2013–2014

59 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalArsenicBenzeneBeryllium, TotalChlorobenzeneCadmiumCarbon TetrachlorideChromiumCombined UraniumDichloromethaneEthylbenzeneFluorideHfpo-DaMercuryNetfosaaNfdhaNmefosaaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpesPftaPftrdaPfunaSeleniumStyreneTetrachloroethyleneThallium, TotalTolueneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: SHAWNEE MUNICIPAL AUTHORITY
Phone: 405-273-1960
Email: [email protected]

Frequently asked questions about Shawnee Municipal Authority

Is Shawnee Municipal Authority tap water safe to drink?

EPA monitoring detected 22 contaminants in Shawnee Municipal Authority'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 Shawnee Municipal Authority's water?

EPA monitoring detected TTHM, Total Haloacetic Acids (HAA5), Bromodichloromethane, Dibromochloromethane, Chloroform, and others. The full list with the level and data source for each is above.

How many people does Shawnee Municipal Authority serve?

Shawnee Municipal Authority reports serving 29,990 people in Oklahoma, per its EPA record.

Has Shawnee Municipal Authority had any water quality violations?

The EPA has 342 violations on file for Shawnee Municipal Authority, of which 303 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.