What was found in ZIP 85234
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-Nitrite | 3835 µg/L 38% of the EPA limit 10000 µg/L Main supplier: MESA CITY OF · 466,000 people · 2016
Highest in the ZIP: 7200 µg/L — GILBERT, TOWN OF · 247,600 people · 2019 | 2/2 | SYR4 |
| Nitrate | 6293.47 µg/L 63% of the EPA limit 10000 µg/L Main supplier: MESA CITY OF · 466,000 people · 2019
Highest in the ZIP: 6800 µg/L — GILBERT, TOWN OF · 247,600 people · 2019 | 2/2 | SYR4 |
| Fluoride | 859.6 µg/L 21% of the EPA limit 4000 µg/L Main supplier: MESA CITY OF · 466,000 people · 2019
Highest in the ZIP: 940 µg/L — GILBERT, TOWN OF · 247,600 people · 2019 | 2/2 | SYR4 |
| Lithium | 525 µg/L No EPA limit set Main supplier: MESA CITY OF · 466,000 people · 2025 | 2/2 | UCMR-5 |
| Chlorite | 468.8 µg/L 47% of the EPA limit 1000 µg/L Main supplier: MESA CITY OF · 466,000 people · 2019 | 1/2 | SYR4 |
| Copper | 150 µg/L 12% of the EPA limit 1300 µg/L Main supplier: MESA CITY OF · 466,000 people · 2018
Highest in the ZIP: 201.45 µg/L — GILBERT, TOWN OF · 247,600 people · 2019 | 2/2 | SYR4 |
| Barium | 102.45 µg/L 5.1% of the EPA limit 2000 µg/L Main supplier: MESA CITY OF · 466,000 people · 2019
Highest in the ZIP: 110 µg/L — GILBERT, TOWN OF · 247,600 people · 2019 | 2/2 | SYR4 |
| TTHM | 76.375 µg/L 95% of the EPA limit 80 µg/L Main supplier: MESA CITY OF · 466,000 people · 2019
Highest in the ZIP: 81.6 µg/L — GILBERT, TOWN OF · 247,600 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 29 µg/L 48% of the EPA limit 60 µg/L Main supplier: MESA CITY OF · 466,000 people · 2019 | 2/2 | SYR4 |
| Bromate | 28.29 µg/L 283% of the EPA limit, at the 95th percentile of samples — 10 µg/L Main supplier: MESA CITY OF · 466,000 people · 2019 | 2/2 | SYR4 |
| Chromium | 19.2718 µg/L 19% of the EPA limit 100 µg/L Main supplier: MESA CITY OF · 466,000 people · 2019 | 2/2 | SYR4 |
| Arsenic | 11 µg/L 110% of the EPA limit, at the 95th percentile of samples — 10 µg/L Main supplier: MESA CITY OF · 466,000 people · 2019 | 2/2 | SYR4 |
| Lead | 8.824 µg/L 59% of the EPA limit 15 µg/L Main supplier: MESA CITY OF · 466,000 people · 2018 | 2/2 | SYR4 |
| Combined Uranium | 6.25325 µg/L 21% of the EPA limit 30 µg/L Highest in the ZIP: GILBERT, TOWN OF · 247,600 people · 2019 | 1/2 | SYR4 |
| Gross Alpha, Excl. Radon And U | 0.8000 pCi/L 5.3% of the EPA limit 15 pCi/L Main supplier: MESA CITY OF · 466,000 people · 2015
Highest in the ZIP: 3.42 pCi/L — GILBERT, TOWN OF · 247,600 people · 2019 | 2/2 | SYR4 |
| Xylenes, Total | 3.1 µg/L 0% of the EPA limit 10000 µg/L Highest in the ZIP: GILBERT, TOWN OF · 247,600 people · 2019 | 1/2 | SYR4 |
| Selenium | 2.2988 µg/L 4.6% of the EPA limit 50 µg/L Main supplier: MESA CITY OF · 466,000 people · 2019
Highest in the ZIP: 3 µg/L — GILBERT, TOWN OF · 247,600 people · 2019 | 2/2 | SYR4 |
| Antimony, Total | 2.83 µg/L 47% of the EPA limit 6 µg/L Main supplier: MESA CITY OF · 466,000 people · 2019 | 1/2 | SYR4 |
| Combined Radium (-226 And -228) | 1.36 pCi/L 27% of the EPA limit 5 pCi/L Main supplier: MESA CITY OF · 466,000 people · 2019
Highest in the ZIP: 1.7 pCi/L — GILBERT, TOWN OF · 247,600 people · 2019 | 2/2 | SYR4 |
| Dalapon | 1.29 µg/L 0.6% of the EPA limit 200 µg/L Highest in the ZIP: GILBERT, TOWN OF · 247,600 people · 2019 | 1/2 | SYR4 |
| Tetrachloroethylene | 1.205 µg/L 24% of the EPA limit 5 µg/L Main supplier: MESA CITY OF · 466,000 people · 2019 | 2/2 | SYR4 |
| Dichloromethane | 0.9200 µg/L 18% of the EPA limit 5 µg/L Main supplier: MESA CITY OF · 466,000 people · 2019 | 1/2 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 0.8300 µg/L 14% of the EPA limit 6 µg/L Highest in the ZIP: GILBERT, TOWN OF · 247,600 people · 2019 | 1/2 | SYR4 |
| Trichloroethylene | 0.6730 µg/L 13% of the EPA limit 5 µg/L Main supplier: MESA CITY OF · 466,000 people · 2019 | 1/2 | SYR4 |
| 2,4-D | 0.6000 µg/L 0.9% of the EPA limit 70 µg/L Highest in the ZIP: GILBERT, TOWN OF · 247,600 people · 2019 | 1/2 | SYR4 |
| Diquat | 0.4100 µg/L 2.1% of the EPA limit 20 µg/L Highest in the ZIP: GILBERT, TOWN OF · 247,600 people · 2019 | 1/2 | SYR4 |
| 1,2-DIBROMO-3-CHLOROPROPANE | 0.0489 µg/L 24% of the EPA limit 0.2000 µg/L Main supplier: MESA CITY OF · 466,000 people · 2019 | 2/2 | SYR4 |
| Ethylene Dibromide | 0.0219 µg/L 44% of the EPA limit 0.0500 µg/L Highest in the ZIP: GILBERT, TOWN OF · 247,600 people · 2019 | 1/2 | SYR4 |
| PFBS | 0.0152 µg/L No EPA limit set Main supplier: MESA CITY OF · 466,000 people · 2025
Highest in the ZIP: 0.0181 µg/L — GILBERT, TOWN OF · 247,600 people · 2024 | 2/2 | UCMR-5 |
| PFOS | 0.0098 µg/L No EPA limit set Highest in the ZIP: GILBERT, TOWN OF · 247,600 people · 2024 | 1/2 | UCMR-5 |
| PFHXS | 0.0093 µg/L No EPA limit set Main supplier: MESA CITY OF · 466,000 people · 2025 | 1/2 | UCMR-5 |
| PFOA | 0.0065 µg/L No EPA limit set Highest in the ZIP: GILBERT, TOWN OF · 247,600 people · 2024 | 1/2 | UCMR-5 |
| Pfpea | 0.0062 µg/L No EPA limit set Highest in the ZIP: GILBERT, TOWN OF · 247,600 people · 2024 | 1/2 | UCMR-5 |
| Pfba | 0.0058 µg/L No EPA limit set Highest in the ZIP: GILBERT, TOWN OF · 247,600 people · 2024 | 1/2 | UCMR-5 |
| Lead | 0.0050 mg/L 33% of the EPA limit 0.0150 mg/L Main supplier: MESA CITY OF · 466,000 people · 2024 | 2/2 | LCR |
| Pfhxa | 0.0032 µg/L No EPA limit set Main supplier: MESA CITY OF · 466,000 people · 2025
Highest in the ZIP: 0.0044 µg/L — GILBERT, TOWN OF · 247,600 people · 2024 | 2/2 | UCMR-5 |
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 85234
| Supplier | State | Population served |
|---|---|---|
| MESA CITY OF | AZ | 466,000 |
| GILBERT, TOWN OF | AZ | 247,600 |
Frequently asked questions about ZIP 85234 tap water
Is the tap water in ZIP 85234 safe to drink?
EPA testing detected 36 contaminants across the water suppliers serving ZIP 85234. 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 85234?
2 public water suppliers report EPA drinking-water monitoring for ZIP 85234. Each is listed above with its population served.
What contaminants are in ZIP 85234's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Fluoride, Lithium, Chlorite, and others across this ZIP's suppliers. The full list with levels and sources is above.