Is Ada Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Local government
Counties served: Pontotoc

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.

health-based violations

violations on file

still open

Violation	Type	Status	Period
TT	Health-based	Resolved	2024-10-17
TT	Health-based	Resolved	2024-10-17
MCL	Health-based	Resolved	2002-01-01 → 2002-01-31
MCL	Health-based	Resolved	2002-01-01 → 2002-01-31
MCL	Health-based	Resolved	2002-01-01 → 2002-01-31
MCL	Health-based	Resolved	2002-01-01 → 2002-01-31
MCL	Health-based	Resolved	1998-08-01 → 1998-08-31
Other	Monitoring	Resolved	2025-07-01
RPT	Monitoring	Resolved	2024-10-17
RPT	Monitoring	Resolved	2024-10-17

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
Copper	299.6 µg/L 23% of the EPA limit 1300 µg/L worst single sample: 645 µg/L	123/123	SYR4	2012–2019
Lead	9.6325 µg/L 64% of the EPA limit 15 µg/L worst single sample: 17 µg/L	84/123	SYR4	2012–2019
Lead	0.0017 mg/L 12% of the EPA limit 0.0150 mg/L	18/18	LCR	2025
TTHM	9.76 µg/L 12% of the EPA limit 80 µg/L worst single sample: 11.6 µg/L	17/39	SYR4	2012–2019
Nitrate-Nitrite	1340 µg/L 13% of the EPA limit 10000 µg/L	16/16	SYR4	2012–2019
Chloroform	3.759 µg/L No EPA limit set worst single sample: 4.27 µg/L	15/27	SYR4	2012–2019
Bromodichloromethane	3.754 µg/L No EPA limit set worst single sample: 4.3 µg/L	14/27	SYR4	2012–2019
Dibromochloromethane	2.825 µg/L No EPA limit set worst single sample: 3.02 µg/L	14/27	SYR4	2012–2019
Bromoform	0.9460 µg/L No EPA limit set worst single sample: 0.9600 µg/L	3/27	SYR4	2012–2019
Arsenic	0.6884 µg/L 6.9% of the EPA limit 10 µg/L worst single sample: 0.6930 µg/L	2/4	SYR4	2012–2017
Combined Radium (-226 And -228)	1.45825 pCi/L 29% of the EPA limit 5 pCi/L worst single sample: 1.475 pCi/L	2/2	SYR4	2012–2017
Gross Alpha, Excl. Radon And U	4.483 pCi/L 30% of the EPA limit 15 pCi/L worst single sample: 4.5 pCi/L	2/2	SYR4	2012–2017
Antimony, Total	1.26 µg/L 21% of the EPA limit 6 µg/L	1/1	SYR4	2015
Barium	49 µg/L 2.5% of the EPA limit 2000 µg/L	1/1	SYR4	2015
Di(2-ethylhexyl) Phthalate	2.6 µg/L 43% of the EPA limit 6 µg/L	1/6	SYR4	2018–2019
Fluoride	840 µg/L 21% of the EPA limit 4000 µg/L	1/1	SYR4	2015
Gross Beta Particle Activity	3.89 pCi/L No EPA limit set	1/2	SYR4	2012–2017
Total Haloacetic Acids (HAA5)	1.11 µg/L 1.9% of the EPA limit 60 µg/L	1/39	SYR4	2012–2019
Trichloroacetic Acid	1.11 µg/L No EPA limit set	1/27	SYR4	2012–2019

90 contaminants tested, none detected

1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDibromoacetic AcidDichloroacetic AcidDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: ADA
Phone: 580-436-8100
Email: [email protected]

Frequently asked questions about Ada

Is Ada tap water safe to drink?

EPA monitoring detected 19 contaminants in Ada'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 Ada's water?

EPA monitoring detected Copper, Lead, Lead, TTHM, Nitrate-Nitrite, and others. The full list with the level and data source for each is above.

How many people does Ada serve?

Ada reports serving 22,600 people in Oklahoma, per its EPA record.

Has Ada had any water quality violations?

The EPA has 27 violations on file for Ada, of which 7 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.