Is Chinle, AZ Tap Water Safe? Quality & Contaminants

What was found in Chinle'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.

Contaminant	Level vs EPA limit	Suppliers	Source
Nitrate	470 µg/L 4.7% of the EPA limit 10000 µg/L Highest in the city: Canyon De Chelly National Monument · 55 people · 2019	1/2	SYR4
Nitrite	340 µg/L 34% of the EPA limit 1000 µg/L Highest in the city: Canyon De Chelly National Monument · 55 people · 2019	1/2	SYR4
Fluoride	291.3 µg/L 7.3% of the EPA limit 4000 µg/L Highest in the city: Canyon De Chelly National Monument · 55 people · 2018	1/2	SYR4
Barium	145.1 µg/L 7.3% of the EPA limit 2000 µg/L Highest in the city: Canyon De Chelly National Monument · 55 people · 2017	1/2	SYR4
Combined Uranium	9.851 µg/L 33% of the EPA limit 30 µg/L Highest in the city: Canyon De Chelly National Monument · 55 people · 2015	1/2	SYR4
Chromium	8 µg/L 8% of the EPA limit 100 µg/L Highest in the city: Canyon De Chelly National Monument · 55 people · 2017	1/2	SYR4
TTHM	2.6 µg/L 3.3% of the EPA limit 80 µg/L Main supplier: Chinle USD 24 Administration Center · 220 people · 2012 Highest in the city: 6.825 µg/L — Canyon De Chelly National Monument · 55 people · 2019	2/2	SYR4
Selenium	4 µg/L 8% of the EPA limit 50 µg/L Highest in the city: Canyon De Chelly National Monument · 55 people · 2017	1/2	SYR4
Total Haloacetic Acids (HAA5)	2 µg/L 3.3% of the EPA limit 60 µg/L Highest in the city: Canyon De Chelly National Monument · 55 people · 2019	1/2	SYR4
Arsenic	1 µg/L 10% of the EPA limit 10 µg/L Highest in the city: Canyon De Chelly National Monument · 55 people · 2017	1/2	SYR4
Styrene	0.6000 µg/L 0.6% of the EPA limit 100 µg/L Highest in the city: Canyon De Chelly National Monument · 55 people · 2018	1/2	SYR4
Lead	0.0050 mg/L 33% of the EPA limit 0.0150 mg/L Main supplier: Chinle USD 24 Administration Center · 220 people · 2022	2/2	LCR

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 Chinle

Supplier	Population served
Chinle USD 24 Administration Center	220
Canyon De Chelly National Monument	55

Frequently asked questions about Chinle tap water

Is Chinle tap water safe to drink?

EPA testing detected 12 contaminants in the water serving Chinle. 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 Chinle?

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

What contaminants are in Chinle's water?

The contaminants EPA monitoring detected in Chinle include Nitrate, Nitrite, Fluoride, Barium, Combined Uranium. 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.