Tap WaterIndex

← Arizona

Tap water quality report

Dennehotso, AZ

EPA monitoring detected 13 contaminants across the 2 water suppliers serving Dennehotso. 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.

2
water suppliers
1,340
people served
13
contaminants found
Arizona rankings Lead in Arizona PFAS in Arizona

What was found in Dennehotso'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
Fluoride
34696.5 µg/L 867%
of the EPA limit, at the 95th percentile of samples — 4000 µg/L
Main supplier: Dennehotso NTUA · 1,040 people · 2019
2/2 SYR4
Nitrate
1410 µg/L 14%
of the EPA limit 10000 µg/L
Main supplier: Dennehotso NTUA · 1,040 people · 2019
Highest in the city: 1900 µg/L — Dennehotso Boarding School BIA · 300 people · 2019
2/2 SYR4
Nitrite
300 µg/L 30%
of the EPA limit 1000 µg/L
Main supplier: Dennehotso NTUA · 1,040 people · 2019
2/2 SYR4
Barium
36 µg/L 1.8%
of the EPA limit 2000 µg/L
Main supplier: Dennehotso NTUA · 1,040 people · 2019
2/2 SYR4
Arsenic
6.53 µg/L 65%
of the EPA limit 10 µg/L
Main supplier: Dennehotso NTUA · 1,040 people · 2019
Highest in the city: 9.895 µg/L — Dennehotso Boarding School BIA · 300 people · 2019
2/2 SYR4
Combined Uranium
9.33 µg/L 31%
of the EPA limit 30 µg/L
Main supplier: Dennehotso NTUA · 1,040 people · 2015
2/2 SYR4
TTHM
6.03 µg/L 7.5%
of the EPA limit 80 µg/L
Main supplier: Dennehotso NTUA · 1,040 people · 2019
2/2 SYR4
Chromium
3.105 µg/L 3.1%
of the EPA limit 100 µg/L
Main supplier: Dennehotso NTUA · 1,040 people · 2019
1/2 SYR4
Gross Alpha, Excl. Radon And U
2.26 pCi/L 15%
of the EPA limit 15 pCi/L
Main supplier: Dennehotso NTUA · 1,040 people · 2015
Highest in the city: 2.4095 pCi/L — Dennehotso Boarding School BIA · 300 people · 2018
2/2 SYR4
Selenium
2 µg/L 4%
of the EPA limit 50 µg/L
Highest in the city: Dennehotso Boarding School BIA · 300 people · 2018
1/2 SYR4
Combined Radium (-226 And -228)
0.5000 pCi/L 10%
of the EPA limit 5 pCi/L
Main supplier: Dennehotso NTUA · 1,040 people · 2015
Highest in the city: 0.8550 pCi/L — Dennehotso Boarding School BIA · 300 people · 2018
2/2 SYR4
Mercury
0.6000 µg/L 30%
of the EPA limit 2 µg/L
Main supplier: Dennehotso NTUA · 1,040 people · 2019
1/2 SYR4
Lead
0.0010 mg/L 6.7%
of the EPA limit 0.0150 mg/L
Main supplier: Dennehotso NTUA · 1,040 people · 2025
Highest in the city: 0.0013 mg/L — Dennehotso Boarding School BIA · 300 people · 2025
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 Dennehotso

SupplierPopulation served
Dennehotso NTUA 1,040
Dennehotso Boarding School BIA 300

Frequently asked questions about Dennehotso tap water

Is Dennehotso tap water safe to drink?

EPA testing detected 13 contaminants in the water serving Dennehotso. 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 Dennehotso?

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

What contaminants are in Dennehotso's water?

The contaminants EPA monitoring detected in Dennehotso include Fluoride, Nitrate, Nitrite, Barium, Arsenic. 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.