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Tap water quality report

Kayenta, AZ

EPA monitoring detected 19 contaminants across the 3 water suppliers serving Kayenta. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

3
water suppliers
5,719
people served
19
contaminants found
Arizona rankings Lead in Arizona PFAS in Arizona

What was found in Kayenta's water

The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
1900 µg/L 19%
of the EPA limit 10000 µg/L
Main supplier: Kayenta NTUA · 3,844 people · 2019
2/3 SYR4
Fluoride
326 µg/L 8.2%
of the EPA limit 4000 µg/L
Main supplier: Kayenta NTUA · 3,844 people · 2019
2/3 SYR4
Nitrite
320 µg/L 32%
of the EPA limit 1000 µg/L
Main supplier: Kayenta NTUA · 3,844 people · 2019
1/3 SYR4
Barium
94.75 µg/L 4.7%
of the EPA limit 2000 µg/L
Main supplier: Kayenta NTUA · 3,844 people · 2019
2/3 SYR4
Lithium
51 µg/L
No EPA limit set
Main supplier: Kayenta NTUA · 3,844 people · 2023
1/3 UCMR-5
Arsenic
22.04 µg/L 220%
of the EPA limit, at the 95th percentile of samples — 10 µg/L
Main supplier: Kayenta NTUA · 3,844 people · 2019
2/3 SYR4
Selenium
9.7 µg/L 19%
of the EPA limit 50 µg/L
Main supplier: Kayenta NTUA · 3,844 people · 2019
2/3 SYR4
Chromium
6.16 µg/L 6.2%
of the EPA limit 100 µg/L
Main supplier: Kayenta NTUA · 3,844 people · 2019
1/3 SYR4
Combined Uranium
4.315 µg/L 14%
of the EPA limit 30 µg/L
Main supplier: Kayenta NTUA · 3,844 people · 2018
2/3 SYR4
Toluene
2.2 µg/L 0.2%
of the EPA limit 1000 µg/L
Highest in the city: Kayenta Community Boarding School BIA · 500 people · 2017
1/3 SYR4
TTHM
2.17 µg/L 2.7%
of the EPA limit 80 µg/L
Main supplier: Kayenta NTUA · 3,844 people · 2018
2/3 SYR4
Gross Alpha, Excl. Radon And U
1.23 pCi/L 8.2%
of the EPA limit 15 pCi/L
Main supplier: Kayenta NTUA · 3,844 people · 2018
Highest in the city: 1.7 pCi/L — Kayenta Community Boarding School BIA · 500 people · 2018
2/3 SYR4
Di(2-ethylhexyl) Phthalate
1.2 µg/L 20%
of the EPA limit 6 µg/L
Main supplier: Kayenta NTUA · 3,844 people · 2019
2/3 SYR4
Combined Radium (-226 And -228)
1.1 pCi/L 22%
of the EPA limit 5 pCi/L
Main supplier: Kayenta NTUA · 3,844 people · 2018
1/3 SYR4
Thallium, Total
0.9000 µg/L 45%
of the EPA limit 2 µg/L
Main supplier: Kayenta NTUA · 3,844 people · 2019
1/3 SYR4
Mercury
0.4900 µg/L 25%
of the EPA limit 2 µg/L
Main supplier: Kayenta NTUA · 3,844 people · 2019
1/3 SYR4
6:2 Fts
0.0051 µg/L
No EPA limit set
Main supplier: Kayenta NTUA · 3,844 people · 2023
1/3 UCMR-5
Lead
0.0010 mg/L 6.7%
of the EPA limit 0.0150 mg/L
Main supplier: Kayenta NTUA · 3,844 people · 2025
Highest in the city: 0.0050 mg/L — Kayenta Sandstone Housing · 1,375 people · 2025
3/3 LCR
2,3,7,8-TCDD
0.000011 µg/L 37%
of the EPA limit 0.000030 µg/L
Highest in the city: Kayenta Community Boarding School BIA · 500 people · 2018
1/3 SYR4
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 the system's samples — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving Kayenta

SupplierPopulation served
Kayenta NTUA 3,844
Kayenta Sandstone Housing 1,375
Kayenta Community Boarding School BIA 500

Frequently asked questions about Kayenta tap water

Is Kayenta tap water safe to drink?

EPA testing detected 19 contaminants in the water serving Kayenta. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve Kayenta?

3 public water suppliers report drinking-water monitoring for Kayenta, Arizona to the EPA. Each is listed above with its population served.

What contaminants are in Kayenta's water?

The contaminants EPA monitoring detected in Kayenta include Nitrate, Fluoride, Nitrite, Barium, Lithium. The full list, with the level at the main supplier and the data source, is in the table above.

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.