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Tap water quality report

Oro Valley, AZ

EPA monitoring detected 19 contaminants across the 2 water suppliers serving Oro Valley. 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
46,850
people served
19
contaminants found
Arizona rankings Lead in Arizona PFAS in Arizona

What was found in Oro Valley'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
2200 µg/L 22%
of the EPA limit 10000 µg/L
Main supplier: ORO VALLEY WATER UTILITY · 42,316 people · 2019
2/2 SYR4
Nitrate-Nitrite
2100 µg/L 21%
of the EPA limit 10000 µg/L
Main supplier: ORO VALLEY WATER UTILITY · 42,316 people · 2019
2/2 SYR4
Fluoride
577 µg/L 14%
of the EPA limit 4000 µg/L
Main supplier: ORO VALLEY WATER UTILITY · 42,316 people · 2019
2/2 SYR4
Copper
175.49999999999997 µg/L 13%
of the EPA limit 1300 µg/L
Main supplier: ORO VALLEY WATER UTILITY · 42,316 people · 2019
2/2 SYR4
Cyanide
160 µg/L 80%
of the EPA limit 200 µg/L
Main supplier: ORO VALLEY WATER UTILITY · 42,316 people · 2019
1/2 SYR4
Barium
23 µg/L 1.2%
of the EPA limit 2000 µg/L
Highest in the city: ORO VALLEY WATER COUNTRYSIDE · 4,534 people · 2013
1/2 SYR4
Lithium
19 µg/L
No EPA limit set
Main supplier: ORO VALLEY WATER UTILITY · 42,316 people · 2025
2/2 UCMR-5
TTHM
14 µg/L 18%
of the EPA limit 80 µg/L
Main supplier: ORO VALLEY WATER UTILITY · 42,316 people · 2019
2/2 SYR4
Mercury
6.7 µg/L 335%
of the EPA limit, at the 95th percentile of samples — 2 µg/L
Main supplier: ORO VALLEY WATER UTILITY · 42,316 people · 2019
1/2 SYR4
Lead
5.064999999999996 µg/L 34%
of the EPA limit 15 µg/L
Main supplier: ORO VALLEY WATER UTILITY · 42,316 people · 2019
Highest in the city: 5.434999999999999 µg/L — ORO VALLEY WATER COUNTRYSIDE · 4,534 people · 2019
2/2 SYR4
Combined Uranium
5.225 µg/L 17%
of the EPA limit 30 µg/L
Main supplier: ORO VALLEY WATER UTILITY · 42,316 people · 2019
1/2 SYR4
Arsenic
3.04 µg/L 30%
of the EPA limit 10 µg/L
Main supplier: ORO VALLEY WATER UTILITY · 42,316 people · 2019
2/2 SYR4
Total Haloacetic Acids (HAA5)
2.7399999999999998 µg/L 4.6%
of the EPA limit 60 µg/L
Main supplier: ORO VALLEY WATER UTILITY · 42,316 people · 2019
1/2 SYR4
Gross Alpha, Excl. Radon And U
2.0149999999999997 pCi/L 13%
of the EPA limit 15 pCi/L
Main supplier: ORO VALLEY WATER UTILITY · 42,316 people · 2019
1/2 SYR4
Combined Radium (-226 And -228)
1.6999999999999997 pCi/L 34%
of the EPA limit 5 pCi/L
Main supplier: ORO VALLEY WATER UTILITY · 42,316 people · 2019
1/2 SYR4
Di(2-ethylhexyl) Phthalate
1.4649999999999999 µg/L 24%
of the EPA limit 6 µg/L
Highest in the city: ORO VALLEY WATER COUNTRYSIDE · 4,534 people · 2019
1/2 SYR4
Xylenes, Total
0.5600 µg/L 0%
of the EPA limit 10000 µg/L
Highest in the city: ORO VALLEY WATER COUNTRYSIDE · 4,534 people · 2019
1/2 SYR4
Benzo(A)Pyrene
0.0300 µg/L 15%
of the EPA limit 0.2000 µg/L
Main supplier: ORO VALLEY WATER UTILITY · 42,316 people · 2019
1/2 SYR4
Lead
0.0010 mg/L 6.7%
of the EPA limit 0.0150 mg/L
Main supplier: ORO VALLEY WATER UTILITY · 42,316 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 Oro Valley

SupplierPopulation served
ORO VALLEY WATER UTILITY 42,316
ORO VALLEY WATER COUNTRYSIDE 4,534

Frequently asked questions about Oro Valley tap water

Is Oro Valley tap water safe to drink?

EPA testing detected 19 contaminants in the water serving Oro Valley. 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 Oro Valley?

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

What contaminants are in Oro Valley's water?

The contaminants EPA monitoring detected in Oro Valley include Nitrate, Nitrate-Nitrite, Fluoride, Copper, Cyanide. 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.