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Tap water quality report

Mountain Dell Water Inc

EPA monitoring tested this supplier for 71 contaminants and detected 9. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

71
contaminants tested
9
detected
250
people served
4
health-based violations
Arizona rankingsLead in ArizonaPFAS in Arizona
Water source
Ground water
Ownership
Private
Counties served
Coconino

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.

4
health-based violations
107
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2024-05-19
TT Health-based Resolved 2024-05-19
TT Health-based Resolved 2024-05-19
TT Health-based Resolved 2024-05-19
Other Monitoring Resolved 2025-07-01
Other Monitoring Resolved 2025-07-01
Other Monitoring Resolved 2024-12-01
Other Monitoring Resolved 2024-12-01
MON Monitoring Resolved 2024-02-01 → 2024-02-29
MON Monitoring Resolved 2024-02-01 → 2024-02-29

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
4200 µg/L 42%
of the EPA limit 10000 µg/L
 16/16 SYR4 2012–2019
Copper
433.4 µg/L 33%
of the EPA limit 1300 µg/L
worst single sample: 558 µg/L
15/15 SYR4 2013–2019
Lead
5.415 µg/L 36%
of the EPA limit 15 µg/L
worst single sample: 6 µg/L
14/15 SYR4 2013–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 8/8 LCR 2025
Arsenic
3.9 µg/L 39%
of the EPA limit 10 µg/L
 1/1 SYR4 2013
Barium
29 µg/L 1.5%
of the EPA limit 2000 µg/L
 1/1 SYR4 2013
Chromium
2.3 µg/L 2.3%
of the EPA limit 100 µg/L
 1/1 SYR4 2013
Gross Alpha, Excl. Radon And U
14 pCi/L 93%
of the EPA limit 15 pCi/L
 1/1 SYR4 2019
Nitrate-Nitrite
2700 µg/L 27%
of the EPA limit 10000 µg/L
 1/1 SYR4 2013
62 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 TetrachlorideChlordaneCombined Radium (-226 And -228)Combined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneFluorideGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
REZNICK, PETER
Phone
928-774-9550
Email
[email protected]

Frequently asked questions about Mountain Dell Water Inc

Is Mountain Dell Water Inc tap water safe to drink?

EPA monitoring detected 9 contaminants in Mountain Dell Water Inc'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 Mountain Dell Water Inc's water?

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

How many people does Mountain Dell Water Inc serve?

Mountain Dell Water Inc reports serving 250 people in Arizona, per its EPA record.

Has Mountain Dell Water Inc had any water quality violations?

The EPA has 107 violations on file for Mountain Dell Water Inc, of which 4 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.