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.
44
health-based violations
104
violations on file
3
still open
| Violation | Type | Status | Period |
|---|---|---|---|
| MCL | Health-based | Resolved | 2011-06-01 → 2011-06-30 |
| MCL | Health-based | Resolved | 2011-06-01 → 2011-06-30 |
| MCL | Health-based | Resolved | 2011-06-01 → 2011-06-30 |
| MCL | Health-based | Resolved | 2011-06-01 → 2011-06-30 |
| MCL | Health-based | Resolved | 2011-06-01 → 2011-06-30 |
| MCL | Health-based | Resolved | 2011-04-01 → 2011-04-30 |
| MCL | Health-based | Resolved | 2011-04-01 → 2011-04-30 |
| MCL | Health-based | Resolved | 2011-04-01 → 2011-04-30 |
| MCL | Health-based | Resolved | 2011-04-01 → 2011-04-30 |
| MCL | Health-based | Resolved | 2011-04-01 → 2011-04-30 |
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 |
|---|---|---|---|---|
| Bromodichloromethane | 10.25 µg/L No EPA limit set
worst single sample: 12 µg/L | 63/63 | SYR4 | 2012–2019 |
| Chloroform | 4.594 µg/L No EPA limit set
worst single sample: 5.5 µg/L | 63/63 | SYR4 | 2012–2019 |
| Dibromochloromethane | 13.665 µg/L No EPA limit set
worst single sample: 20.1 µg/L | 62/63 | SYR4 | 2012–2019 |
| Bromoform | 16.04 µg/L No EPA limit set
worst single sample: 27.8 µg/L | 57/63 | SYR4 | 2012–2019 |
| TTHM | 41.8 µg/L 52% of the EPA limit 80 µg/L
worst single sample: 62.1 µg/L | 54/54 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 15.065 µg/L No EPA limit set
worst single sample: 21.8 µg/L | 52/54 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 9.6 µg/L No EPA limit set
worst single sample: 12 µg/L | 52/54 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 25.67 µg/L 43% of the EPA limit 60 µg/L
worst single sample: 31.5 µg/L | 52/54 | SYR4 | 2012–2019 |
| Copper | 1200 µg/L 92% of the EPA limit 1300 µg/L
worst single sample: 2200 µg/L | 47/47 | SYR4 | 2012–2017 |
| Trichloroacetic Acid | 2.5 µg/L No EPA limit set
worst single sample: 4.1 µg/L | 42/54 | SYR4 | 2012–2019 |
| Nitrate | 522 µg/L 5.2% of the EPA limit 10000 µg/L
worst single sample: 570 µg/L | 24/24 | SYR4 | 2012–2019 |
| Lead | 0.0011 mg/L 7.4% of the EPA limit 0.0150 mg/L | 11/11 | LCR | 2023 |
| Lead | 5.2 µg/L 35% of the EPA limit 15 µg/L
worst single sample: 5.3 µg/L | 11/47 | SYR4 | 2012–2017 |
| Fluoride | 505.5 µg/L 13% of the EPA limit 4000 µg/L
worst single sample: 510 µg/L | 10/10 | SYR4 | 2012–2019 |
| Barium | 110 µg/L 5.5% of the EPA limit 2000 µg/L | 9/9 | SYR4 | 2012–2019 |
| Selenium | 5.4 µg/L 11% of the EPA limit 50 µg/L
worst single sample: 5.7 µg/L | 6/9 | SYR4 | 2012–2019 |
| Monobromoacetic Acid | 1.1 µg/L No EPA limit set | 4/54 | SYR4 | 2012–2019 |
| Monochloroacetic Acid | 6.77 µg/L No EPA limit set
worst single sample: 6.8 µg/L | 4/54 | SYR4 | 2012–2019 |
| Lithium | 59.4 µg/L No EPA limit set | 4/4 | UCMR-5 | 2025 |
| Arsenic | 2.09 µg/L 21% of the EPA limit 10 µg/L
worst single sample: 2.1 µg/L | 3/9 | SYR4 | 2012–2019 |
| Cyanide | 109 µg/L 55% of the EPA limit 200 µg/L
worst single sample: 110 µg/L | 2/6 | SYR4 | 2014–2019 |
| Di(2-ethylhexyl) Phthalate | 0.8185 µg/L 14% of the EPA limit 6 µg/L
worst single sample: 0.8300 µg/L | 2/13 | SYR4 | 2012–2019 |
| Antimony, Total | 0.6340 µg/L 11% of the EPA limit 6 µg/L | 1/9 | SYR4 | 2012–2019 |
| Chromium | 1.64 µg/L 1.6% of the EPA limit 100 µg/L | 1/9 | SYR4 | 2012–2019 |
| Combined Radium (-226 And -228) | 1.5 pCi/L 30% of the EPA limit 5 pCi/L | 1/1 | SYR4 | 2016 |
| Combined Uranium | 1.5 µg/L 5% of the EPA limit 30 µg/L | 1/1 | SYR4 | 2016 |
| Gross Beta Particle Activity | 6.8 pCi/L No EPA limit set | 1/1 | SYR4 | 2016 |
| Thallium, Total | 0.0300 µg/L 1.5% of the EPA limit 2 µg/L | 1/9 | 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, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDinosebEthylene DibromideEndrinEthylbenzeneGross Alpha, Excl. Radon And UHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPFBSPfdaPfdoaPfeesaPfhpaPfhpsPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about Hidalgo County Mud 1
Is Hidalgo County Mud 1 tap water safe to drink?
EPA monitoring detected 31 contaminants in Hidalgo County Mud 1'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 Hidalgo County Mud 1's water?
EPA monitoring detected Bromodichloromethane, Chloroform, Dibromochloromethane, Bromoform, TTHM, and others. The full list with the level and data source for each is above.
How many people does Hidalgo County Mud 1 serve?
Hidalgo County Mud 1 reports serving 8,420 people in Texas, per its EPA record.
Has Hidalgo County Mud 1 had any water quality violations?
The EPA has 104 violations on file for Hidalgo County Mud 1, of which 44 are health-based (a contaminant limit or required treatment was breached) and 3 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.