What was found in ZIP 85737
The level at this ZIP's main supplier, the highest level anywhere in it, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 4000 µg/L 40% of the EPA limit 10000 µg/L Main supplier: METROPOLITAN DWID · 45,570 people · 2019 | 2/2 | SYR4 |
| Nitrate-Nitrite | 3400 µg/L 34% of the EPA limit 10000 µg/L Main supplier: METROPOLITAN DWID · 45,570 people · 2019 | 2/2 | SYR4 |
| Fluoride | 371.9999999999999 µg/L 9.3% of the EPA limit 4000 µg/L Main supplier: METROPOLITAN DWID · 45,570 people · 2018
Highest in the ZIP: 577 µg/L — ORO VALLEY WATER UTILITY · 42,316 people · 2019 | 2/2 | SYR4 |
| Nitrite | 260 µg/L 26% of the EPA limit 1000 µg/L Main supplier: METROPOLITAN DWID · 45,570 people · 2019 | 1/2 | SYR4 |
| Copper | 190 µg/L 15% of the EPA limit 1300 µg/L Main supplier: METROPOLITAN DWID · 45,570 people · 2019 | 2/2 | SYR4 |
| Barium | 177.99999999999997 µg/L 8.9% of the EPA limit 2000 µg/L Main supplier: METROPOLITAN DWID · 45,570 people · 2018 | 1/2 | SYR4 |
| Cyanide | 160 µg/L 80% of the EPA limit 200 µg/L Highest in the ZIP: ORO VALLEY WATER UTILITY · 42,316 people · 2019 | 1/2 | SYR4 |
| Lithium | 18.3 µg/L No EPA limit set Main supplier: METROPOLITAN DWID · 45,570 people · 2025
Highest in the ZIP: 19 µg/L — ORO VALLEY WATER UTILITY · 42,316 people · 2025 | 2/2 | UCMR-5 |
| TTHM | 6.9 µg/L 8.6% of the EPA limit 80 µg/L Main supplier: METROPOLITAN DWID · 45,570 people · 2019
Highest in the ZIP: 14 µg/L — ORO VALLEY WATER UTILITY · 42,316 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 11.39 µg/L 19% of the EPA limit 60 µg/L Main supplier: METROPOLITAN DWID · 45,570 people · 2019 | 2/2 | SYR4 |
| Xylenes, Total | 6.879999999999999 µg/L 0.1% of the EPA limit 10000 µg/L Main supplier: METROPOLITAN DWID · 45,570 people · 2019 | 1/2 | SYR4 |
| Mercury | 6.7 µg/L 335% of the EPA limit, at the 95th percentile of samples — 2 µg/L Highest in the ZIP: ORO VALLEY WATER UTILITY · 42,316 people · 2019 | 1/2 | SYR4 |
| Combined Uranium | 4.714999999999999 µg/L 16% of the EPA limit 30 µg/L Main supplier: METROPOLITAN DWID · 45,570 people · 2019
Highest in the ZIP: 5.225 µg/L — ORO VALLEY WATER UTILITY · 42,316 people · 2019 | 2/2 | SYR4 |
| Lead | 4.14 µg/L 28% of the EPA limit 15 µg/L Main supplier: METROPOLITAN DWID · 45,570 people · 2019
Highest in the ZIP: 5.064999999999996 µg/L — ORO VALLEY WATER UTILITY · 42,316 people · 2019 | 2/2 | SYR4 |
| Selenium | 4.0249999999999995 µg/L 8% of the EPA limit 50 µg/L Main supplier: METROPOLITAN DWID · 45,570 people · 2018 | 1/2 | SYR4 |
| Arsenic | 2.28 µg/L 23% of the EPA limit 10 µg/L Main supplier: METROPOLITAN DWID · 45,570 people · 2018
Highest in the ZIP: 3.04 µg/L — ORO VALLEY WATER UTILITY · 42,316 people · 2019 | 2/2 | SYR4 |
| Chromium | 2.87 µg/L 2.9% of the EPA limit 100 µg/L Main supplier: METROPOLITAN DWID · 45,570 people · 2018 | 1/2 | SYR4 |
| cis-1,2-Dichloroethylene | 2.7199999999999998 µg/L 3.9% of the EPA limit 70 µg/L Main supplier: METROPOLITAN DWID · 45,570 people · 2019 | 1/2 | SYR4 |
| Gross Alpha, Excl. Radon And U | 1.585 pCi/L 11% of the EPA limit 15 pCi/L Main supplier: METROPOLITAN DWID · 45,570 people · 2019
Highest in the ZIP: 2.0149999999999997 pCi/L — ORO VALLEY WATER UTILITY · 42,316 people · 2019 | 2/2 | SYR4 |
| Combined Radium (-226 And -228) | 1.25 pCi/L 25% of the EPA limit 5 pCi/L Main supplier: METROPOLITAN DWID · 45,570 people · 2019
Highest in the ZIP: 1.6999999999999997 pCi/L — ORO VALLEY WATER UTILITY · 42,316 people · 2019 | 2/2 | SYR4 |
| Ethylbenzene | 1.2269999999999999 µg/L 0.2% of the EPA limit 700 µg/L Main supplier: METROPOLITAN DWID · 45,570 people · 2019 | 1/2 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 0.7600 µg/L 13% of the EPA limit 6 µg/L Main supplier: METROPOLITAN DWID · 45,570 people · 2019 | 1/2 | SYR4 |
| Benzo(A)Pyrene | 0.0300 µg/L 15% of the EPA limit 0.2000 µg/L Highest in the ZIP: ORO VALLEY WATER UTILITY · 42,316 people · 2019 | 1/2 | SYR4 |
| PFBS | 0.0048 µg/L No EPA limit set Main supplier: METROPOLITAN DWID · 45,570 people · 2025 | 1/2 | UCMR-5 |
| PFHXS | 0.0039 µg/L No EPA limit set Main supplier: METROPOLITAN DWID · 45,570 people · 2025 | 1/2 | UCMR-5 |
| Lead | 0.00057 mg/L 3.8% of the EPA limit 0.0150 mg/L Main supplier: METROPOLITAN DWID · 45,570 people · 2025
Highest in the ZIP: 0.0010 mg/L — 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.
Water suppliers serving ZIP 85737
| Supplier | State | Population served |
|---|---|---|
| METROPOLITAN DWID | AZ | 45,570 |
| ORO VALLEY WATER UTILITY | AZ | 42,316 |
Frequently asked questions about ZIP 85737 tap water
Is the tap water in ZIP 85737 safe to drink?
EPA testing detected 26 contaminants across the water suppliers serving ZIP 85737. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and your utility's annual Consumer Confidence Report for the official status.
Which water suppliers serve ZIP 85737?
2 public water suppliers report EPA drinking-water monitoring for ZIP 85737. Each is listed above with its population served.
What contaminants are in ZIP 85737's water?
EPA monitoring detected Nitrate, Nitrate-Nitrite, Fluoride, Nitrite, Copper, and others across this ZIP's suppliers. The full list with levels and sources is above.