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.
0
health-based violations
13
violations on file
0
still open
| Violation | Type | Status | Period |
|---|---|---|---|
| RPT | Monitoring | Resolved | 2025-07-02 |
| RPT | Monitoring | Resolved | 2025-07-02 |
| MR | Monitoring | Resolved | 2018-05-01 → 2018-05-31 |
| MR | Monitoring | Resolved | 2018-05-01 → 2018-05-31 |
| MR | Monitoring | Resolved | 2018-05-01 → 2018-05-31 |
| MR | Monitoring | Resolved | 2018-05-01 → 2018-05-31 |
| MR | Monitoring | Resolved | 2012-04-01 → 2012-04-30 |
| MR | Monitoring | Resolved | 2012-04-01 → 2012-04-30 |
| MR | Monitoring | Resolved | 2012-04-01 → 2012-04-30 |
| MR | Monitoring | Resolved | 2012-04-01 → 2012-04-30 |
PFAS detected
PFAS are industrial “forever chemicals”. These are the EPA's latest
nationwide test results (2023–2025).
| Contaminant | Max | Detection rate | Period |
|---|---|---|---|
| Pfba | 0.0272 µg/L | 4/8 | 2024 |
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 |
|---|---|---|---|---|
| Chlorite | 700 µg/L 70% of the EPA limit 1000 µg/L
worst single sample: 850 µg/L | 462/466 | SYR4 | 2013–2019 |
| Bromodichloromethane | 8.6 µg/L No EPA limit set
worst single sample: 24.8 µg/L | 268/268 | SYR4 | 2012–2019 |
| Bromoform | 37.15 µg/L No EPA limit set
worst single sample: 69.3 µg/L | 268/268 | SYR4 | 2012–2019 |
| Dibromochloromethane | 26.465 µg/L No EPA limit set
worst single sample: 45.8 µg/L | 268/268 | SYR4 | 2012–2019 |
| TTHM | 79.14 µg/L 99% of the EPA limit 80 µg/L
worst single sample: 123.5 µg/L | 249/249 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 26 µg/L 43% of the EPA limit 60 µg/L
worst single sample: 39.3 µg/L | 246/249 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 18.28 µg/L No EPA limit set
worst single sample: 31.5 µg/L | 245/249 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 4.7 µg/L No EPA limit set
worst single sample: 7.1 µg/L | 245/249 | SYR4 | 2012–2019 |
| Chloroform | 4.2 µg/L No EPA limit set
worst single sample: 8.4 µg/L | 211/268 | SYR4 | 2012–2019 |
| Copper | 140.7 µg/L 11% of the EPA limit 1300 µg/L
worst single sample: 320 µg/L | 161/162 | SYR4 | 2012–2018 |
| Trichloroacetic Acid | 3.385 µg/L No EPA limit set
worst single sample: 4.2 µg/L | 84/249 | SYR4 | 2012–2019 |
| Monobromoacetic Acid | 6.84 µg/L No EPA limit set
worst single sample: 9.9 µg/L | 59/249 | SYR4 | 2012–2019 |
| Lead | 4.7065 µg/L 31% of the EPA limit 15 µg/L
worst single sample: 7 µg/L | 50/162 | SYR4 | 2012–2018 |
| Nitrate | 307.5 µg/L 3.1% of the EPA limit 10000 µg/L
worst single sample: 390 µg/L | 36/40 | SYR4 | 2012–2019 |
| Fluoride | 750 µg/L 19% of the EPA limit 4000 µg/L
worst single sample: 1070 µg/L | 17/17 | SYR4 | 2012–2019 |
| Barium | 119 µg/L 5.9% of the EPA limit 2000 µg/L
worst single sample: 128 µg/L | 16/16 | SYR4 | 2012–2019 |
| Monochloroacetic Acid | 9.325 µg/L No EPA limit set
worst single sample: 23.5 µg/L | 16/249 | SYR4 | 2012–2019 |
| Lead | 0.0023 mg/L 15% of the EPA limit 0.0150 mg/L | 13/13 | LCR | 2024 |
| Cyanide | 148 µg/L 74% of the EPA limit 200 µg/L
worst single sample: 160 µg/L | 9/12 | SYR4 | 2014–2019 |
| Selenium | 6.66 µg/L 13% of the EPA limit 50 µg/L
worst single sample: 6.9 µg/L | 9/16 | SYR4 | 2012–2019 |
| Arsenic | 3.23 µg/L 32% of the EPA limit 10 µg/L
worst single sample: 3.3 µg/L | 8/16 | SYR4 | 2012–2019 |
| Lithium | 51.8 µg/L No EPA limit set | 8/8 | UCMR-5 | 2024 |
| Gross Beta Particle Activity | 6.1 pCi/L No EPA limit set
worst single sample: 6.2 pCi/L | 5/6 | SYR4 | 2012–2018 |
| Combined Uranium | 2.625 µg/L 8.8% of the EPA limit 30 µg/L
worst single sample: 2.7 µg/L | 4/4 | SYR4 | 2014–2018 |
| Gross Alpha, Excl. Radon And U | 3.7 pCi/L 25% of the EPA limit 15 pCi/L
worst single sample: 4 pCi/L | 4/4 | SYR4 | 2014–2018 |
| Antimony, Total | 0.5920 µg/L 9.9% of the EPA limit 6 µg/L | 1/16 | SYR4 | 2012–2019 |
| Carbon Tetrachloride | 1 µg/L 20% of the EPA limit 5 µg/L | 1/20 | SYR4 | 2012–2019 |
| Chromium | 0.4120 µg/L 0.4% of the EPA limit 100 µg/L | 1/16 | SYR4 | 2012–2019 |
| Combined Radium (-226 And -228) | 2.9 pCi/L 58% of the EPA limit 5 pCi/L | 1/2 | SYR4 | 2012–2017 |
| Di(2-ethylhexyl) Phthalate | 2 µg/L 33% of the EPA limit 6 µg/L | 1/20 | SYR4 | 2012–2019 |
| Methoxychlor | 0.2000 µg/L 0.5% of the EPA limit 40 µg/L | 1/20 | SYR4 | 2012–2019 |
| Thallium, Total | 0.0090 µg/L 0.5% of the EPA limit 2 µg/L | 1/16 | SYR4 | 2012–2019 |
77 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAsbestosAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCadmiumCarbofuranChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDinosebEthylene DibromideEndrinEthylbenzeneHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryNetfosaaNfdhaNmefosaaNitrate-NitriteNitriteOxamylPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about Mcallen Public Utility
Is Mcallen Public Utility tap water safe to drink?
EPA monitoring detected 33 contaminants in Mcallen Public Utility'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 Mcallen Public Utility's water?
EPA monitoring detected Chlorite, Bromodichloromethane, Bromoform, Dibromochloromethane, TTHM, and others. The full list with the level and data source for each is above.
How many people does Mcallen Public Utility serve?
Mcallen Public Utility reports serving 189,957 people in Texas, per its EPA record.
Has Mcallen Public Utility had any water quality violations?
The EPA has 13 violations on file for Mcallen Public Utility, of which 0 are health-based (a contaminant limit or required treatment was breached) and 0 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.