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Tap water quality report

Granite Mountain Water Company

EPA monitoring tested this supplier for 70 contaminants and detected 11. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

70
contaminants tested
11
detected
381
people served
5
health-based violations
Arizona rankingsLead in ArizonaPFAS in Arizona
Water source
Ground water
Ownership
Private
Counties served
Yavapai

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.

5
health-based violations
143
violations on file
2
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2014-12-01 → 2014-12-31
MCL Health-based Resolved 2014-12-01 → 2014-12-31
MCL Health-based Resolved 2007-07-01 → 2007-07-31
MCL Health-based Resolved 1999-06-01 → 1999-06-30
MCL Health-based Resolved 1999-01-01 → 1999-01-31
Other Monitoring Unaddressed 2025-11-13
Other Monitoring Resolved 2025-10-02
Other Monitoring Resolved 2025-10-02
Other Monitoring Unaddressed 2025-07-01
MR Monitoring Resolved 2023-07-01 → 2023-09-30

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
5500 µg/L 55%
of the EPA limit 10000 µg/L
worst single sample: 5900 µg/L
50/50 SYR4 2012–2019
Copper
260 µg/L 20%
of the EPA limit 1300 µg/L
 14/15 SYR4 2013–2019
Nitrate-Nitrite
5278 µg/L 53%
of the EPA limit 10000 µg/L
worst single sample: 5350 µg/L
10/10 SYR4 2012–2017
Lead
0.0110 mg/L 73%
of the EPA limit 0.0150 mg/L
 9/9 LCR 2025
Lead
4.88 µg/L 33%
of the EPA limit 15 µg/L
worst single sample: 5.7 µg/L
5/15 SYR4 2013–2019
TTHM
8.82 µg/L 11%
of the EPA limit 80 µg/L
worst single sample: 9.9 µg/L
5/6 SYR4 2012–2017
Arsenic
3.495 µg/L 35%
of the EPA limit 10 µg/L
worst single sample: 3.5 µg/L
2/2 SYR4 2017
Barium
28.8 µg/L 1.4%
of the EPA limit 2000 µg/L
worst single sample: 29 µg/L
2/2 SYR4 2017
Chromium
2.635 µg/L 2.6%
of the EPA limit 100 µg/L
worst single sample: 2.7 µg/L
2/2 SYR4 2017
Fluoride
478 µg/L 12%
of the EPA limit 4000 µg/L
worst single sample: 480 µg/L
2/2 SYR4 2017
Total Haloacetic Acids (HAA5)
1.4 µg/L 2.3%
of the EPA limit 60 µg/L
 1/7 SYR4 2012–2017
59 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,3,7,8-TCDD2,4,5-TP2,4-DAntimony, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
FELMAN, DANIEL
Phone
928-778-2600
Email
[email protected]

Frequently asked questions about Granite Mountain Water Company

Is Granite Mountain Water Company tap water safe to drink?

EPA monitoring detected 11 contaminants in Granite Mountain Water Company'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 Granite Mountain Water Company's water?

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

How many people does Granite Mountain Water Company serve?

Granite Mountain Water Company reports serving 381 people in Arizona, per its EPA record.

Has Granite Mountain Water Company had any water quality violations?

The EPA has 143 violations on file for Granite Mountain Water Company, of which 5 are health-based (a contaminant limit or required treatment was breached) and 2 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.