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Tap water quality report

Granite Oaks Water Users Association

EPA monitoring tested this supplier for 70 contaminants and detected 10. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

70
contaminants tested
10
detected
1,200
people served
0
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.

0
health-based violations
133
violations on file
4
still open
ViolationTypeStatusPeriod
Other Monitoring Unaddressed 2025-11-26
RPT Monitoring Resolved 2025-07-02
RPT Monitoring Resolved 2025-07-02
MR Monitoring Resolved 2025-05-01 → 2025-05-31
MR Monitoring Resolved 2025-05-01 → 2025-05-31
MR Monitoring Unaddressed 2024-10-01
MR Monitoring Unaddressed 2024-10-01
MR Monitoring Resolved 2022-04-01 → 2022-06-30
MR Monitoring Resolved 2022-04-01 → 2022-06-30
MR Monitoring Resolved 2022-04-01 → 2022-06-30

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
Copper
144.8 µg/L 11%
of the EPA limit 1300 µg/L
worst single sample: 256 µg/L
25/30 SYR4 2012–2018
Nitrate
2496.51 µg/L 25%
of the EPA limit 10000 µg/L
worst single sample: 2500 µg/L
24/26 SYR4 2012–2019
TTHM
23.7 µg/L 30%
of the EPA limit 80 µg/L
worst single sample: 25.8 µg/L
13/13 SYR4 2012–2019
Lead
54 µg/L 360%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
worst single sample: 103 µg/L
11/30 SYR4 2012–2018
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 7/7 LCR 2021
Nitrate-Nitrite
2408 µg/L 24%
of the EPA limit 10000 µg/L
worst single sample: 2420 µg/L
3/4 SYR4 2012–2018
Total Haloacetic Acids (HAA5)
5.365 µg/L 8.9%
of the EPA limit 60 µg/L
worst single sample: 5.4 µg/L
2/14 SYR4 2012–2019
Arsenic
2.7 µg/L 27%
of the EPA limit 10 µg/L
 1/1 SYR4 2012
Barium
10 µg/L 0.5%
of the EPA limit 2000 µg/L
 1/1 SYR4 2012
Fluoride
360 µg/L 9%
of the EPA limit 4000 µg/L
 1/1 SYR4 2012
60 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 TetrachlorideChlordaneChromiumCombined Radium (-226 And -228)DichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNitriteOxamylPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
GRANITE OAKS WUA
Phone
928-713-0548
Email
[email protected]

Frequently asked questions about Granite Oaks Water Users Association

Is Granite Oaks Water Users Association tap water safe to drink?

EPA monitoring detected 10 contaminants in Granite Oaks Water Users Association'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 Oaks Water Users Association's water?

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

How many people does Granite Oaks Water Users Association serve?

Granite Oaks Water Users Association reports serving 1,200 people in Arizona, per its EPA record.

Has Granite Oaks Water Users Association had any water quality violations?

The EPA has 133 violations on file for Granite Oaks Water Users Association, of which 0 are health-based (a contaminant limit or required treatment was breached) and 4 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.