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Tap water quality report

Grand Canyon National Park

EPA monitoring tested this supplier for 110 contaminants and detected 17. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

110
contaminants tested
17
detected
16,590
people served
26
health-based violations
Arizona rankingsLead in ArizonaPFAS in Arizona
Water source
Ground water
Ownership
Federal government
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.

26
health-based violations
436
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2024-10-17
TT Health-based Resolved 2024-10-17
MCL Health-based Resolved 2024-04-01 → 2024-06-30
MCL Health-based Resolved 2024-04-01 → 2024-06-30
MCL Health-based Resolved 2024-04-01 → 2024-06-30
MCL Health-based Resolved 2024-04-01 → 2024-06-30
TT Health-based Resolved 2022-07-01 → 2022-07-31
TT Health-based Resolved 2022-07-01 → 2022-07-31
TT Health-based Resolved 2022-07-01 → 2022-07-31
TT Health-based Resolved 2022-07-01 → 2022-07-31

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
Copper
920 µg/L 71%
of the EPA limit 1300 µg/L
worst single sample: 1500 µg/L
179/179 SYR4 2013–2019
TTHM
116.325 µg/L 145%
of the EPA limit, at the 95th percentile of samples — 80 µg/L
worst single sample: 158 µg/L
86/86 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
90.975 µg/L 152%
of the EPA limit, at the 95th percentile of samples — 60 µg/L
worst single sample: 158 µg/L
82/89 SYR4 2012–2019
Lead
12.7 µg/L 85%
of the EPA limit 15 µg/L
worst single sample: 43.4 µg/L
67/179 SYR4 2013–2019
Bromodichloromethane
8.02 µg/L
No EPA limit set
worst single sample: 8.4 µg/L
20/20 SYR4 2018–2019
Dibromochloromethane
2.31 µg/L
No EPA limit set
worst single sample: 2.4 µg/L
19/20 SYR4 2018–2019
Dichloroacetic Acid
38.72 µg/L
No EPA limit set
worst single sample: 61.4 µg/L
19/20 SYR4 2018–2019
Chloroform
123.8 µg/L
No EPA limit set
worst single sample: 151 µg/L
18/18 SYR4 2018–2019
Nitrate
190 µg/L 1.9%
of the EPA limit 10000 µg/L
 16/16 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 15/15 LCR 2025
Trichloroacetic Acid
80.9 µg/L
No EPA limit set
worst single sample: 90.9 µg/L
11/20 SYR4 2018–2019
Monochloroacetic Acid
5.66 µg/L
No EPA limit set
worst single sample: 5.7 µg/L
5/20 SYR4 2018–2019
Arsenic
1.1 µg/L 11%
of the EPA limit 10 µg/L
 1/1 SYR4 2018
Barium
100 µg/L 5%
of the EPA limit 2000 µg/L
 1/1 SYR4 2018
Chromium
1.4 µg/L 1.4%
of the EPA limit 100 µg/L
 1/1 SYR4 2018
Fluoride
52 µg/L 1.3%
of the EPA limit 4000 µg/L
 1/1 SYR4 2018
Nitrate-Nitrite
160 µg/L 1.6%
of the EPA limit 10000 µg/L
 1/1 SYR4 2012
93 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, TotalBromoformChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneCombined Radium (-226 And -228)DichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDibromoacetic AcidDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorMonobromoacetic AcidNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneLithiumO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
STONE, TREACY
Email
[email protected]

Frequently asked questions about Grand Canyon National Park

Is Grand Canyon National Park tap water safe to drink?

EPA monitoring detected 17 contaminants in Grand Canyon National Park'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 Grand Canyon National Park's water?

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

How many people does Grand Canyon National Park serve?

Grand Canyon National Park reports serving 16,590 people in Arizona, per its EPA record.

Has Grand Canyon National Park had any water quality violations?

The EPA has 436 violations on file for Grand Canyon National Park, of which 26 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.