What was found in ZIP 85742
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 | 4741.5 µg/L 47% of the EPA limit 10000 µg/L Main supplier: TUCSON CITY OF · 732,906 people · 2019 | 4/4 | SYR4 |
| Nitrate-Nitrite | 4160 µg/L 42% of the EPA limit 10000 µg/L Main supplier: TUCSON CITY OF · 732,906 people · 2019 | 4/4 | SYR4 |
| Fluoride | 626.15 µg/L 16% of the EPA limit 4000 µg/L Main supplier: TUCSON CITY OF · 732,906 people · 2019 | 4/4 | SYR4 |
| Nitrite | 260 µg/L 26% of the EPA limit 1000 µg/L Highest in the ZIP: METROPOLITAN DWID · 45,570 people · 2019 | 1/4 | SYR4 |
| Copper | 197.5 µg/L 15% of the EPA limit 1300 µg/L Main supplier: TUCSON CITY OF · 732,906 people · 2017 | 4/4 | SYR4 |
| Barium | 110.25 µg/L 5.5% of the EPA limit 2000 µg/L Main supplier: TUCSON CITY OF · 732,906 people · 2019
Highest in the ZIP: 178 µg/L — METROPOLITAN DWID · 45,570 people · 2018 | 4/4 | SYR4 |
| Lithium | 63.7 µg/L No EPA limit set Main supplier: TUCSON CITY OF · 732,906 people · 2025 | 4/4 | UCMR-5 |
| TTHM | 22.05 µg/L 28% of the EPA limit 80 µg/L Main supplier: TUCSON CITY OF · 732,906 people · 2019
Highest in the ZIP: 24.55 µg/L — MARANA MUNICIPAL - HARTMAN VISTAS · 5,248 people · 2019 | 4/4 | SYR4 |
| Combined Uranium | 12.92 µg/L 43% of the EPA limit 30 µg/L Main supplier: TUCSON CITY OF · 732,906 people · 2019 | 2/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 2.57 µg/L 4.3% of the EPA limit 60 µg/L Main supplier: TUCSON CITY OF · 732,906 people · 2019
Highest in the ZIP: 11.39 µg/L — METROPOLITAN DWID · 45,570 people · 2019 | 3/4 | SYR4 |
| Dibromochloromethane | 10.14 µg/L No EPA limit set Highest in the ZIP: MARANA MUNICIPAL - HARTMAN VISTAS · 5,248 people · 2019 | 1/4 | SYR4 |
| Cyanide | 9.09 µg/L 4.5% of the EPA limit 200 µg/L Main supplier: TUCSON CITY OF · 732,906 people · 2019 | 1/4 | SYR4 |
| Xylenes, Total | 7.025 µg/L 0.1% of the EPA limit 10000 µg/L Main supplier: TUCSON CITY OF · 732,906 people · 2019 | 4/4 | SYR4 |
| Bromoform | 6.82 µg/L No EPA limit set Highest in the ZIP: MARANA MUNICIPAL - HARTMAN VISTAS · 5,248 people · 2019 | 1/4 | SYR4 |
| Arsenic | 6.7335 µg/L 67% of the EPA limit 10 µg/L Main supplier: TUCSON CITY OF · 732,906 people · 2019 | 4/4 | SYR4 |
| Lead | 1.4925 µg/L 10% of the EPA limit 15 µg/L Main supplier: TUCSON CITY OF · 732,906 people · 2017
Highest in the ZIP: 5.435 µg/L — ORO VALLEY WATER COUNTRYSIDE · 4,534 people · 2019 | 4/4 | SYR4 |
| Bromodichloromethane | 5.38 µg/L No EPA limit set Highest in the ZIP: MARANA MUNICIPAL - HARTMAN VISTAS · 5,248 people · 2019 | 1/4 | SYR4 |
| Selenium | 2.961 µg/L 5.9% of the EPA limit 50 µg/L Main supplier: TUCSON CITY OF · 732,906 people · 2019
Highest in the ZIP: 4.025 µg/L — METROPOLITAN DWID · 45,570 people · 2018 | 2/4 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 3.72 µg/L 62% of the EPA limit 6 µg/L Main supplier: TUCSON CITY OF · 732,906 people · 2019 | 4/4 | SYR4 |
| Chromium | 2.87 µg/L 2.9% of the EPA limit 100 µg/L Highest in the ZIP: METROPOLITAN DWID · 45,570 people · 2018 | 1/4 | SYR4 |
| cis-1,2-Dichloroethylene | 2.72 µg/L 3.9% of the EPA limit 70 µg/L Highest in the ZIP: METROPOLITAN DWID · 45,570 people · 2019 | 1/4 | SYR4 |
| Gross Alpha, Excl. Radon And U | 2.69 pCi/L 18% of the EPA limit 15 pCi/L Main supplier: TUCSON CITY OF · 732,906 people · 2019 | 2/4 | SYR4 |
| Dibromoacetic Acid | 2.055 µg/L No EPA limit set Highest in the ZIP: MARANA MUNICIPAL - HARTMAN VISTAS · 5,248 people · 2019 | 1/4 | SYR4 |
| Trichloroethylene | 2.05 µg/L 41% of the EPA limit 5 µg/L Main supplier: TUCSON CITY OF · 732,906 people · 2019 | 1/4 | SYR4 |
| Chloroform | 1.97 µg/L No EPA limit set Highest in the ZIP: MARANA MUNICIPAL - HARTMAN VISTAS · 5,248 people · 2019 | 1/4 | SYR4 |
| 1,1-Dichloroethylene | 1.8 µg/L 26% of the EPA limit 7 µg/L Main supplier: TUCSON CITY OF · 732,906 people · 2019 | 1/4 | SYR4 |
| Antimony, Total | 1.8 µg/L 30% of the EPA limit 6 µg/L Main supplier: TUCSON CITY OF · 732,906 people · 2019 | 1/4 | SYR4 |
| Dichloroacetic Acid | 1.57 µg/L No EPA limit set Highest in the ZIP: MARANA MUNICIPAL - HARTMAN VISTAS · 5,248 people · 2019 | 1/4 | SYR4 |
| Combined Radium (-226 And -228) | 1.06 pCi/L 21% of the EPA limit 5 pCi/L Main supplier: TUCSON CITY OF · 732,906 people · 2019
Highest in the ZIP: 1.25 pCi/L — METROPOLITAN DWID · 45,570 people · 2019 | 3/4 | SYR4 |
| Ethylbenzene | 1.1 µg/L 0.2% of the EPA limit 700 µg/L Main supplier: TUCSON CITY OF · 732,906 people · 2019
Highest in the ZIP: 1.227 µg/L — METROPOLITAN DWID · 45,570 people · 2019 | 2/4 | SYR4 |
| Pentachlorophenol | 0.1200 µg/L 12% of the EPA limit 1 µg/L Main supplier: TUCSON CITY OF · 732,906 people · 2019 | 1/4 | SYR4 |
| Simazine | 0.1100 µg/L 2.8% of the EPA limit 4 µg/L Main supplier: TUCSON CITY OF · 732,906 people · 2019 | 1/4 | SYR4 |
| Atrazine | 0.1058 µg/L 3.5% of the EPA limit 3 µg/L Main supplier: TUCSON CITY OF · 732,906 people · 2019 | 1/4 | SYR4 |
| PFOS | 0.0230 µg/L No EPA limit set Highest in the ZIP: MARANA MUNICIPAL - HARTMAN VISTAS · 5,248 people · 2024 | 1/4 | UCMR-5 |
| PFHXS | 0.0150 µg/L No EPA limit set Highest in the ZIP: MARANA MUNICIPAL - HARTMAN VISTAS · 5,248 people · 2024 | 2/4 | UCMR-5 |
| Pfba | 0.0081 µg/L No EPA limit set Main supplier: TUCSON CITY OF · 732,906 people · 2025 | 1/4 | UCMR-5 |
| PFBS | 0.0048 µg/L No EPA limit set Highest in the ZIP: METROPOLITAN DWID · 45,570 people · 2025 | 1/4 | UCMR-5 |
| Lead | 0.00065 mg/L 4.3% of the EPA limit 0.0150 mg/L Main supplier: TUCSON CITY OF · 732,906 people · 2023 | 4/4 | 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 85742
| Supplier | State | Population served |
|---|---|---|
| TUCSON CITY OF | 732,906 | |
| METROPOLITAN DWID | AZ | 45,570 |
| MARANA MUNICIPAL - HARTMAN VISTAS | AZ | 5,248 |
| ORO VALLEY WATER COUNTRYSIDE | AZ | 4,534 |
Frequently asked questions about ZIP 85742 tap water
Is the tap water in ZIP 85742 safe to drink?
EPA testing detected 38 contaminants across the water suppliers serving ZIP 85742. 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 85742?
4 public water suppliers report EPA drinking-water monitoring for ZIP 85742. Each is listed above with its population served.
What contaminants are in ZIP 85742'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.