Is Dilkon-Indian Wells-Greasewood-White Cone Ntua Tap Water Safe? Quality Report

Water source: Ground water
Ownership: Native American

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.

125

health-based violations

200

violations on file

still open

Violation	Type	Status	Period
MCL	Health-based	Resolved	2024-01-01 → 2024-03-31
MCL	Health-based	Resolved	2024-01-01 → 2024-03-31
MCL	Health-based	Resolved	2023-10-01 → 2023-12-31
MCL	Health-based	Resolved	2023-10-01 → 2023-12-31
MCL	Health-based	Resolved	2023-07-01 → 2023-09-30
MCL	Health-based	Resolved	2023-07-01 → 2023-09-30
MCL	Health-based	Resolved	2023-04-01 → 2023-06-30
MCL	Health-based	Resolved	2023-04-01 → 2023-06-30
MCL	Health-based	Resolved	2023-01-01 → 2023-03-31
MCL	Health-based	Resolved	2023-01-01 → 2023-03-31

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
TTHM	180.9 µg/L 226% of the EPA limit, at the 95th percentile of samples — 80 µg/L worst single sample: 246 µg/L	67/68	SYR4	2012–2019
Total Haloacetic Acids (HAA5)	59.58 µg/L 99% of the EPA limit 60 µg/L worst single sample: 100 µg/L	45/68	SYR4	2012–2019
Barium	1596.5 µg/L 80% of the EPA limit 2000 µg/L worst single sample: 1720 µg/L	14/14	SYR4	2014–2018
Lead	0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L	14/14	LCR	2025
Fluoride	1047.5 µg/L 26% of the EPA limit 4000 µg/L worst single sample: 1050 µg/L	6/6	SYR4	2014–2018
Arsenic	8.31 µg/L 83% of the EPA limit 10 µg/L worst single sample: 8.8 µg/L	3/6	SYR4	2014–2018
Lithium	92.4 µg/L No EPA limit set	3/3	UCMR-5	2025
Combined Radium (-226 And -228)	1.835 pCi/L 37% of the EPA limit 5 pCi/L worst single sample: 1.9 pCi/L	2/4	SYR4	2014–2016
Gross Alpha, Excl. Radon And U	2.105 pCi/L 14% of the EPA limit 15 pCi/L worst single sample: 2.2 pCi/L	2/4	SYR4	2014–2016
Nitrite	499 µg/L 50% of the EPA limit 1000 µg/L worst single sample: 500 µg/L	2/23	SYR4	2012–2019
Combined Uranium	0.9000 µg/L 3% of the EPA limit 30 µg/L	1/4	SYR4	2014–2016

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-PF3OUdS2,3,7,8-TCDD2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitrateOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact: Walter Haase
Phone: 9287295721
Email: generalmanager@ntua.com

Frequently asked questions about Dilkon-Indian Wells-Greasewood-White Cone Ntua

Is Dilkon-Indian Wells-Greasewood-White Cone Ntua tap water safe to drink?

EPA monitoring detected 11 contaminants in Dilkon-Indian Wells-Greasewood-White Cone Ntua'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 Dilkon-Indian Wells-Greasewood-White Cone Ntua's water?

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

How many people does Dilkon-Indian Wells-Greasewood-White Cone Ntua serve?

Dilkon-Indian Wells-Greasewood-White Cone Ntua reports serving 4,986 people in Arizona, per its EPA record.

Has Dilkon-Indian Wells-Greasewood-White Cone Ntua had any water quality violations?

The EPA has 200 violations on file for Dilkon-Indian Wells-Greasewood-White Cone Ntua, of which 125 are health-based (a contaminant limit or required treatment was breached) and 1 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.