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
6
violations on file
0
still open
| Violation | Type | Status | Period |
|---|---|---|---|
| MON | Monitoring | Resolved | 2020-11-01 → 2020-11-30 |
| MON | Monitoring | Resolved | 2020-11-01 → 2020-11-30 |
| MON | Monitoring | Resolved | 2020-11-01 → 2020-11-30 |
| MON | Monitoring | Resolved | 2020-11-01 → 2020-11-30 |
| MR | Monitoring | Archived | 1993-07-01 → 1993-07-31 |
| Other | Monitoring | Archived | 1993-07-01 → 1993-07-31 |
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 | 18.4 µg/L No EPA limit set
worst single sample: 22 µg/L | 261/268 | SYR4 | 2012–2019 |
| Bromoform | 27.4 µg/L No EPA limit set
worst single sample: 42.4 µg/L | 261/268 | SYR4 | 2012–2019 |
| Chloroform | 11 µg/L No EPA limit set
worst single sample: 17.5 µg/L | 261/268 | SYR4 | 2012–2019 |
| Dibromochloromethane | 26.6 µg/L No EPA limit set
worst single sample: 33.7 µg/L | 261/268 | SYR4 | 2012–2019 |
| TTHM | 80.33 µg/L 100% of the EPA limit, at the 95th percentile of samples — 80 µg/L
worst single sample: 100 µg/L | 243/249 | SYR4 | 2012–2019 |
| Total Haloacetic Acids (HAA5) | 33.5 µg/L 56% of the EPA limit 60 µg/L
worst single sample: 40 µg/L | 241/249 | SYR4 | 2012–2019 |
| Dibromoacetic Acid | 15.6 µg/L No EPA limit set
worst single sample: 19.4 µg/L | 240/249 | SYR4 | 2012–2019 |
| Trichloroacetic Acid | 6.7 µg/L No EPA limit set
worst single sample: 8.8 µg/L | 238/249 | SYR4 | 2012–2019 |
| Dichloroacetic Acid | 11.18 µg/L No EPA limit set
worst single sample: 13.7 µg/L | 237/249 | SYR4 | 2012–2019 |
| Copper | 281.455 µg/L 22% of the EPA limit 1300 µg/L
worst single sample: 769.8 µg/L | 192/192 | SYR4 | 2012–2018 |
| Lead | 4.8625 µg/L 32% of the EPA limit 15 µg/L
worst single sample: 45 µg/L | 96/192 | SYR4 | 2012–2018 |
| Monobromoacetic Acid | 9.72 µg/L No EPA limit set
worst single sample: 13.1 µg/L | 38/249 | SYR4 | 2012–2019 |
| Nitrate | 410.5 µg/L 4.1% of the EPA limit 10000 µg/L
worst single sample: 460 µg/L | 32/36 | SYR4 | 2012–2019 |
| Monochloroacetic Acid | 6.8 µg/L No EPA limit set
worst single sample: 7.7 µg/L | 21/249 | SYR4 | 2012–2019 |
| Fluoride | 622.5 µg/L 16% of the EPA limit 4000 µg/L
worst single sample: 630 µg/L | 16/16 | SYR4 | 2012–2019 |
| Barium | 135.6 µg/L 6.8% of the EPA limit 2000 µg/L
worst single sample: 146 µg/L | 14/14 | SYR4 | 2013–2019 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L | 13/13 | LCR | 2024 |
| Arsenic | 2.6 µg/L 26% of the EPA limit 10 µg/L | 11/14 | SYR4 | 2013–2019 |
| Selenium | 5.375 µg/L 11% of the EPA limit 50 µg/L
worst single sample: 5.6 µg/L | 10/14 | SYR4 | 2013–2019 |
| Lithium | 46.9 µg/L No EPA limit set | 8/8 | UCMR-5 | 2024 |
| Cyanide | 155 µg/L 78% of the EPA limit 200 µg/L
worst single sample: 170 µg/L | 7/12 | SYR4 | 2014–2019 |
| Atrazine | 0.1280 µg/L 4.3% of the EPA limit 3 µg/L
worst single sample: 0.1300 µg/L | 3/25 | SYR4 | 2012–2019 |
| Combined Uranium | 2.245 µg/L 7.5% of the EPA limit 30 µg/L
worst single sample: 2.3 µg/L | 2/2 | SYR4 | 2017 |
| Di(2-ethylhexyl) Phthalate | 1.095 µg/L 18% of the EPA limit 6 µg/L
worst single sample: 1.1 µg/L | 2/25 | SYR4 | 2012–2019 |
| Gross Beta Particle Activity | 6.91 pCi/L No EPA limit set
worst single sample: 7 pCi/L | 2/2 | SYR4 | 2017 |
| Pentachlorophenol | 0.1370 µg/L 14% of the EPA limit 1 µg/L
worst single sample: 0.1400 µg/L | 2/24 | SYR4 | 2012–2019 |
| Carbon Tetrachloride | 0.6000 µg/L 12% of the EPA limit 5 µg/L | 1/19 | SYR4 | 2012–2019 |
| Ethylbenzene | 1.38 µg/L 0.2% of the EPA limit 700 µg/L | 1/19 | SYR4 | 2012–2019 |
| Vinyl Chloride | 0.6000 µg/L 30% of the EPA limit 2 µg/L | 1/51 | SYR4 | 2012–2019 |
| Xylenes, Total | 9.95 µg/L 0.1% of the EPA limit 10000 µg/L | 1/19 | SYR4 | 2012–2019 |
74 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-PF3ONSAdonaAntimony, TotalAsbestosBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCadmiumCarbofuranChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDinosebEthylene DibromideEndrinGross Alpha, Excl. Radon And UHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPFBSPfdaPfdoaPfeesaPfhpaPfhpsPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpesPftaPftrdaPfunaPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethylenecis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene
Utility contact
Frequently asked questions about Harlingen Water Works
Is Harlingen Water Works tap water safe to drink?
EPA monitoring detected 33 contaminants in Harlingen Water Works'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 Harlingen Water Works's water?
EPA monitoring detected Bromodichloromethane, Bromoform, Chloroform, Dibromochloromethane, TTHM, and others. The full list with the level and data source for each is above.
How many people does Harlingen Water Works serve?
Harlingen Water Works reports serving 85,900 people in Texas, per its EPA record.
Has Harlingen Water Works had any water quality violations?
The EPA has 6 violations on file for Harlingen Water Works, 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.