Compliance record
Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.
12
health-based violations
1,241
violations on file
2
still open
| Violation | Type | Status | Period |
|---|---|---|---|
| TT | Health-based | Resolved | 2017-10-01 |
| TT | Health-based | Resolved | 2017-10-01 |
| MCL | Health-based | Resolved | 2017-07-01 → 2017-09-30 |
| MCL | Health-based | Resolved | 2017-07-01 → 2017-09-30 |
| MCL | Health-based | Resolved | 2017-07-01 → 2017-09-30 |
| MCL | Health-based | Resolved | 2017-07-01 → 2017-09-30 |
| MCL | Health-based | Resolved | 2017-04-01 → 2017-06-30 |
| MCL | Health-based | Resolved | 2017-04-01 → 2017-06-30 |
| MCL | Health-based | Resolved | 2017-04-01 → 2017-06-30 |
| MCL | Health-based | Resolved | 2017-04-01 → 2017-06-30 |
PFAS detected
PFAS are industrial “forever chemicals”. These are the EPA's latest
nationwide test results (2023–2025).
Other contaminants detected
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 this
system's samples — over 100% is worth reading, but is not by itself a
violation. Where a single sample came in higher than that percentile, it
is noted under the bar. Formal violations are listed separately.
| Contaminant | Level vs EPA limit | Detection rate | Source | Period |
|---|---|---|---|---|
| Nitrate | 6800 µg/L 68% of the EPA limit 10000 µg/L
worst single sample: 8000 µg/L | 480/494 | SYR4 | 2012–2019 |
| TTHM | 81.6 µg/L 102% of the EPA limit, at the 95th percentile of samples — 80 µg/L
worst single sample: 110 µg/L | 269/270 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 27.7 µg/L 46% of the EPA limit 60 µg/L
worst single sample: 48 µg/L | 244/262 | SYR4 | 2012–2019 |
| Arsenic | 9.655 µg/L 97% of the EPA limit 10 µg/L
worst single sample: 12 µg/L | 190/203 | SYR4 | 2012–2019 |
| Copper | 201.45 µg/L 15% of the EPA limit 1300 µg/L
worst single sample: 336 µg/L | 150/151 | SYR4 | 2013–2019 |
| Lead | 3.81 µg/L 25% of the EPA limit 15 µg/L
worst single sample: 10 µg/L | 114/151 | SYR4 | 2013–2019 |
| Bromate | 14 µg/L 140% of the EPA limit, at the 95th percentile of samples — 10 µg/L
worst single sample: 29 µg/L | 106/162 | SYR4 | 2012–2019 |
| Barium | 110 µg/L 5.5% of the EPA limit 2000 µg/L
worst single sample: 140 µg/L | 86/87 | SYR4 | 2012–2019 |
| Fluoride | 940 µg/L 24% of the EPA limit 4000 µg/L
worst single sample: 1000 µg/L | 85/87 | SYR4 | 2012–2019 |
| Chromium | 16 µg/L 16% of the EPA limit 100 µg/L
worst single sample: 19 µg/L | 71/87 | SYR4 | 2012–2019 |
| Nitrate-Nitrite | 7200 µg/L 72% of the EPA limit 10000 µg/L
worst single sample: 8000 µg/L | 70/76 | SYR4 | 2012–2019 |
| Combined Uranium | 6.25325 µg/L 21% of the EPA limit 30 µg/L
worst single sample: 7.6 µg/L | 46/50 | SYR4 | 2012–2019 |
| Lithium | 258 µg/L No EPA limit set | 42/42 | UCMR-5 | 2024 |
| Gross Alpha, Excl. Radon And U | 3.42 pCi/L 23% of the EPA limit 15 pCi/L
worst single sample: 3.9 pCi/L | 25/50 | SYR4 | 2012–2019 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 11/11 | LCR | 2025 |
| Selenium | 3 µg/L 6% of the EPA limit 50 µg/L
worst single sample: 3.1 µg/L | 5/87 | SYR4 | 2012–2019 |
| 2,4-D | 0.6000 µg/L 0.9% of the EPA limit 70 µg/L
worst single sample: 0.6500 µg/L | 3/100 | SYR4 | 2012–2019 |
| Combined Radium (-226 And -228) | 1.7 pCi/L 34% of the EPA limit 5 pCi/L
worst single sample: 1.8 pCi/L | 3/50 | SYR4 | 2012–2019 |
| Dalapon | 1.29 µg/L 0.6% of the EPA limit 200 µg/L
worst single sample: 1.3 µg/L | 3/102 | SYR4 | 2012–2019 |
| Ethylene Dibromide | 0.0219 µg/L 44% of the EPA limit 0.0500 µg/L
worst single sample: 0.0220 µg/L | 2/96 | SYR4 | 2012–2019 |
| Tetrachloroethylene | 0.7290 µg/L 15% of the EPA limit 5 µg/L
worst single sample: 0.7400 µg/L | 2/107 | SYR4 | 2012–2019 |
| 1,2-DIBROMO-3-CHLOROPROPANE | 0.0220 µg/L 11% of the EPA limit 0.2000 µg/L | 1/96 | SYR4 | 2012–2019 |
| Di(2-ethylhexyl) Phthalate | 0.8300 µg/L 14% of the EPA limit 6 µg/L | 1/105 | SYR4 | 2012–2019 |
| Diquat | 0.4100 µg/L 2.1% of the EPA limit 20 µg/L | 1/97 | SYR4 | 2012–2019 |
| Xylenes, Total | 3.1 µg/L 0% of the EPA limit 10000 µg/L | 1/102 | SYR4 | 2012–2019 |
74 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,3,7,8-TCDD2,4,5-TP4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDi(2-ethylhexyl) AdipateDinosebEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfdaPfdoaPfeesaPfhpaPfhpsPFHXSPfmbaPfmpaPFNAPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl Chloridecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about Gilbert, Town of
Is Gilbert, Town of tap water safe to drink?
EPA monitoring detected 31 contaminants in Gilbert, Town of's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.
What contaminants were detected in Gilbert, Town of's water?
EPA monitoring detected Nitrate, TTHM, Total Haloacetic Acids (HAA5), Arsenic, Copper, and others. The full list with the level and data source for each is above.
How many people does Gilbert, Town of serve?
Gilbert, Town of reports serving 247,600 people in Arizona, per its EPA record.
Has Gilbert, Town of had any water quality violations?
The EPA has 1241 violations on file for Gilbert, Town of, of which 12 are health-based (a contaminant limit or required treatment was breached) and 2 remain open. The rest are monitoring or reporting failures.
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.