Is Nichols Hills Tap Water Safe? Quality Report

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

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

323

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	2016-04-01 → 2016-06-30
MCL	Health-based	Resolved	2016-04-01 → 2016-06-30
MCL	Health-based	Resolved	2016-04-01 → 2016-06-30
MCL	Health-based	Resolved	2016-04-01 → 2016-06-30
MCL	Health-based	Resolved	2016-01-01 → 2016-03-31
MCL	Health-based	Resolved	2016-01-01 → 2016-03-31
MCL	Health-based	Resolved	2016-01-01 → 2016-03-31
MCL	Health-based	Resolved	2016-01-01 → 2016-03-31

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	182.3 µg/L 14% of the EPA limit 1300 µg/L worst single sample: 200 µg/L	59/60	SYR4	2012–2018
Combined Uranium	24.5 µg/L 82% of the EPA limit 30 µg/L worst single sample: 47.3 µg/L	20/20	SYR4	2012–2019
Arsenic	14.96 µg/L 150% of the EPA limit, at the 95th percentile of samples — 10 µg/L worst single sample: 15.5 µg/L	19/33	SYR4	2012–2019
Gross Alpha, Excl. Radon And U	17.548 pCi/L 117% of the EPA limit, at the 95th percentile of samples — 15 pCi/L worst single sample: 27.97 pCi/L	19/20	SYR4	2012–2019
Nitrate-Nitrite	319.1 µg/L 3.2% of the EPA limit 10000 µg/L worst single sample: 320 µg/L	19/21	SYR4	2012–2019
Gross Beta Particle Activity	14.57 pCi/L No EPA limit set worst single sample: 14.7 pCi/L	14/20	SYR4	2012–2019
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L	13/13	LCR	2024
Nitrate	320 µg/L 3.2% of the EPA limit 10000 µg/L	10/12	SYR4	2012–2018
Combined Radium (-226 And -228)	2.954 pCi/L 59% of the EPA limit 5 pCi/L worst single sample: 3.43 pCi/L	8/20	SYR4	2012–2019
Bromoform	4.7445 µg/L No EPA limit set worst single sample: 4.8 µg/L	4/18	SYR4	2014–2019
Dibromochloromethane	3.012 µg/L No EPA limit set worst single sample: 3.06 µg/L	4/18	SYR4	2014–2019
TTHM	8.535 µg/L 11% of the EPA limit 80 µg/L worst single sample: 8.58 µg/L	4/7	SYR4	2014–2019
Barium	111.8 µg/L 5.6% of the EPA limit 2000 µg/L worst single sample: 116 µg/L	3/3	SYR4	2016–2019
Chromium	20.6 µg/L 21% of the EPA limit 100 µg/L worst single sample: 21 µg/L	3/3	SYR4	2016–2019
Fluoride	396 µg/L 9.9% of the EPA limit 4000 µg/L worst single sample: 410 µg/L	3/3	SYR4	2016–2019
Lithium	16 µg/L No EPA limit set	3/3	UCMR-5	2025
Bromodichloromethane	1.11 µg/L No EPA limit set	2/18	SYR4	2014–2019
Dibromoacetic Acid	1.14 µg/L No EPA limit set	1/7	SYR4	2014–2019
Selenium	5.5 µg/L 11% of the EPA limit 50 µg/L	1/3	SYR4	2016–2019
Total Haloacetic Acids (HAA5)	1.14 µg/L 1.9% of the EPA limit 60 µg/L	1/7	SYR4	2014–2019

92 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-PF3ONSAdonaAntimony, TotalAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChloroformDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDichloroacetic AcidDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorMonobromoacetic AcidMonochloroacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroacetic AcidTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: NICHOLS HILLS, CITY OF
Phone: 405-843-5222
Email: [email protected]

Frequently asked questions about Nichols Hills

Is Nichols Hills tap water safe to drink?

EPA monitoring detected 20 contaminants in Nichols Hills'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 Nichols Hills's water?

EPA monitoring detected Copper, Combined Uranium, Arsenic, Gross Alpha, Excl. Radon And U, Nitrate-Nitrite, and others. The full list with the level and data source for each is above.

How many people does Nichols Hills serve?

Nichols Hills reports serving 4,020 people in Oklahoma, per its EPA record.

Has Nichols Hills had any water quality violations?

The EPA has 323 violations on file for Nichols Hills, of which 47 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.