What was found in Gilbert'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.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 6800 µg/L 68% of the EPA limit 10000 µg/L Main supplier: GILBERT, TOWN OF · 247,600 people · 2019
Highest in the city: 7277.5 µg/L — SONTEL WATER COOP · 80 people · 2019 | 2/2 | SYR4 |
| Nitrate-Nitrite | 7200 µg/L 72% of the EPA limit 10000 µg/L Main supplier: GILBERT, TOWN OF · 247,600 people · 2019 | 2/2 | SYR4 |
| Fluoride | 940 µg/L 24% of the EPA limit 4000 µg/L Main supplier: GILBERT, TOWN OF · 247,600 people · 2019 | 2/2 | SYR4 |
| Lithium | 258 µg/L No EPA limit set Main supplier: GILBERT, TOWN OF · 247,600 people · 2024 | 1/2 | UCMR-5 |
| Copper | 201.45 µg/L 15% of the EPA limit 1300 µg/L Main supplier: GILBERT, TOWN OF · 247,600 people · 2019 | 2/2 | SYR4 |
| Barium | 110 µg/L 5.5% of the EPA limit 2000 µg/L Main supplier: GILBERT, TOWN OF · 247,600 people · 2019 | 2/2 | SYR4 |
| TTHM | 81.6 µg/L 102% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: GILBERT, TOWN OF · 247,600 people · 2019 | 1/2 | SYR4 |
| Lead | 3.81 µg/L 25% of the EPA limit 15 µg/L Main supplier: GILBERT, TOWN OF · 247,600 people · 2019
Highest in the city: 38.02 µg/L — SONTEL WATER COOP · 80 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 27.7 µg/L 46% of the EPA limit 60 µg/L Main supplier: GILBERT, TOWN OF · 247,600 people · 2019 | 1/2 | SYR4 |
| Chromium | 16 µg/L 16% of the EPA limit 100 µg/L Main supplier: GILBERT, TOWN OF · 247,600 people · 2019 | 2/2 | SYR4 |
| Bromate | 14 µg/L 140% of the EPA limit, at the 95th percentile of samples — 10 µg/L Main supplier: GILBERT, TOWN OF · 247,600 people · 2019 | 1/2 | SYR4 |
| Arsenic | 9.655 µg/L 97% of the EPA limit 10 µg/L Main supplier: GILBERT, TOWN OF · 247,600 people · 2019 | 2/2 | SYR4 |
| Combined Uranium | 6.25325 µg/L 21% of the EPA limit 30 µg/L Main supplier: GILBERT, TOWN OF · 247,600 people · 2019 | 1/2 | SYR4 |
| Gross Alpha, Excl. Radon And U | 3.42 pCi/L 23% of the EPA limit 15 pCi/L Main supplier: GILBERT, TOWN OF · 247,600 people · 2019 | 1/2 | SYR4 |
| Xylenes, Total | 3.1 µg/L 0% of the EPA limit 10000 µg/L Main supplier: GILBERT, TOWN OF · 247,600 people · 2019 | 1/2 | SYR4 |
| Selenium | 3 µg/L 6% of the EPA limit 50 µg/L Main supplier: GILBERT, TOWN OF · 247,600 people · 2019 | 1/2 | SYR4 |
| Combined Radium (-226 And -228) | 1.7 pCi/L 34% of the EPA limit 5 pCi/L Main supplier: GILBERT, TOWN OF · 247,600 people · 2019 | 1/2 | SYR4 |
| Dalapon | 1.29 µg/L 0.6% of the EPA limit 200 µg/L Main supplier: GILBERT, TOWN OF · 247,600 people · 2019 | 1/2 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 0.8300 µg/L 14% of the EPA limit 6 µg/L Main supplier: GILBERT, TOWN OF · 247,600 people · 2019 | 1/2 | SYR4 |
| Tetrachloroethylene | 0.7290 µg/L 15% of the EPA limit 5 µg/L Main supplier: GILBERT, TOWN OF · 247,600 people · 2019 | 1/2 | SYR4 |
| 2,4-D | 0.6000 µg/L 0.9% of the EPA limit 70 µg/L Main supplier: GILBERT, TOWN OF · 247,600 people · 2019 | 1/2 | SYR4 |
| Diquat | 0.4100 µg/L 2.1% of the EPA limit 20 µg/L Main supplier: GILBERT, TOWN OF · 247,600 people · 2019 | 1/2 | SYR4 |
| 1,2-DIBROMO-3-CHLOROPROPANE | 0.0220 µg/L 11% of the EPA limit 0.2000 µg/L Main supplier: GILBERT, TOWN OF · 247,600 people · 2019 | 1/2 | SYR4 |
| Ethylene Dibromide | 0.0219 µg/L 44% of the EPA limit 0.0500 µg/L Main supplier: GILBERT, TOWN OF · 247,600 people · 2019 | 1/2 | SYR4 |
| PFBS | 0.0181 µg/L No EPA limit set Main supplier: GILBERT, TOWN OF · 247,600 people · 2024 | 1/2 | UCMR-5 |
| PFOS | 0.0098 µg/L No EPA limit set Main supplier: GILBERT, TOWN OF · 247,600 people · 2024 | 1/2 | UCMR-5 |
| PFOA | 0.0065 µg/L No EPA limit set Main supplier: GILBERT, TOWN OF · 247,600 people · 2024 | 1/2 | UCMR-5 |
| Pfpea | 0.0062 µg/L No EPA limit set Main supplier: GILBERT, TOWN OF · 247,600 people · 2024 | 1/2 | UCMR-5 |
| Pfba | 0.0058 µg/L No EPA limit set Main supplier: GILBERT, TOWN OF · 247,600 people · 2024 | 1/2 | UCMR-5 |
| Pfhxa | 0.0044 µg/L No EPA limit set Main supplier: GILBERT, TOWN OF · 247,600 people · 2024 | 1/2 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: GILBERT, TOWN OF · 247,600 people · 2025
Highest in the city: 0.00033 mg/L — SONTEL WATER COOP · 80 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 Gilbert
| Supplier | Population served |
|---|---|
| GILBERT, TOWN OF | 247,600 |
| SONTEL WATER COOP | 80 |
Frequently asked questions about Gilbert tap water
Is Gilbert tap water safe to drink?
EPA testing detected 31 contaminants in the water serving Gilbert. 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 Gilbert?
2 public water suppliers report drinking-water monitoring for Gilbert, Arizona to the EPA. Each is listed above with its population served.
What contaminants are in Gilbert's water?
The contaminants EPA monitoring detected in Gilbert include Nitrate, Nitrate-Nitrite, Fluoride, Lithium, Copper. 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.