Tap WaterIndex

← Arizona

Tap water quality report

Mariano Lake-Pinedale-Church Rock Ntua

EPA monitoring tested this supplier for 101 contaminants and detected 15. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

101
contaminants tested
15
detected
4,562
people served
7
health-based violations
Arizona rankingsLead in ArizonaPFAS in Arizona
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.

7
health-based violations
87
violations on file
1
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2010-10-01 → 2010-12-31
MCL Health-based Resolved 2005-10-01 → 2005-10-31
MCL Health-based Resolved 2005-10-01 → 2005-10-31
MCL Health-based Resolved 2004-08-01 → 2004-08-31
MCL Health-based Resolved 2004-08-01 → 2004-08-31
MCL Health-based Resolved 2003-09-01 → 2003-09-30
MCL Health-based Resolved 2003-09-01 → 2003-09-30
MR Monitoring Resolved 2021-01-01 → 2021-12-31
MR Monitoring Resolved 2020-01-01 → 2020-12-31
MR Monitoring Resolved 2020-01-01 → 2020-12-31

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.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Nitrate
5800 µg/L 58%
of the EPA limit 10000 µg/L
worst single sample: 5900 µg/L
78/100 SYR4 2012–2019
Fluoride
3395 µg/L 85%
of the EPA limit 4000 µg/L
worst single sample: 5360 µg/L
23/23 SYR4 2013–2019
Barium
328 µg/L 16%
of the EPA limit 2000 µg/L
worst single sample: 457 µg/L
21/22 SYR4 2012–2019
Combined Uranium
22.65 µg/L 76%
of the EPA limit 30 µg/L
worst single sample: 38.4 µg/L
19/23 SYR4 2012–2019
Gross Alpha, Excl. Radon And U
4.8 pCi/L 32%
of the EPA limit 15 pCi/L
worst single sample: 5.1 pCi/L
13/23 SYR4 2012–2019
Lead
0.0029 mg/L 19%
of the EPA limit 0.0150 mg/L
 12/12 LCR 2025
Lithium
67 µg/L
No EPA limit set
 10/10 UCMR-5 2023
Arsenic
9.07 µg/L 91%
of the EPA limit 10 µg/L
worst single sample: 9.7 µg/L
8/28 SYR4 2012–2019
Combined Radium (-226 And -228)
1.125 pCi/L 23%
of the EPA limit 5 pCi/L
worst single sample: 1.3 pCi/L
8/23 SYR4 2012–2019
Chromium
4.02 µg/L 4%
of the EPA limit 100 µg/L
worst single sample: 4.3 µg/L
5/22 SYR4 2012–2019
Mercury
0.7600 µg/L 38%
of the EPA limit 2 µg/L
worst single sample: 0.8000 µg/L
5/18 SYR4 2012–2019
Nitrite
397 µg/L 40%
of the EPA limit 1000 µg/L
worst single sample: 400 µg/L
4/50 SYR4 2012–2019
Selenium
7 µg/L 14%
of the EPA limit 50 µg/L
 1/22 SYR4 2012–2019
TTHM
6.7 µg/L 8.4%
of the EPA limit 80 µg/L
 1/6 SYR4 2013–2018
Toluene
0.9000 µg/L 0.1%
of the EPA limit 1000 µg/L
 1/13 SYR4 2013–2019
86 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 TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMethoxychlorNetfosaaNfdhaNmefosaaOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTotal Haloacetic Acids (HAA5)Total Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
David Shoultz
Phone
9287296277
Email
davids@ntua.com

Frequently asked questions about Mariano Lake-Pinedale-Church Rock Ntua

Is Mariano Lake-Pinedale-Church Rock Ntua tap water safe to drink?

EPA monitoring detected 15 contaminants in Mariano Lake-Pinedale-Church Rock 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 Mariano Lake-Pinedale-Church Rock Ntua's water?

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

How many people does Mariano Lake-Pinedale-Church Rock Ntua serve?

Mariano Lake-Pinedale-Church Rock Ntua reports serving 4,562 people in Arizona, per its EPA record.

Has Mariano Lake-Pinedale-Church Rock Ntua had any water quality violations?

The EPA has 87 violations on file for Mariano Lake-Pinedale-Church Rock Ntua, of which 7 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.