What was found in ZIP 78552
The level at this ZIP's main supplier, the highest level anywhere in it, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Chlorite | 864.8 µg/L 86% of the EPA limit 1000 µg/L Highest in the ZIP: EAST RIO HONDO WSC · 24,756 people · 2019 | 1/3 | SYR4 |
| Copper | 281.455 µg/L 22% of the EPA limit 1300 µg/L Main supplier: HARLINGEN WATER WORKS SYSTEM · 85,900 people · 2018
Highest in the ZIP: 737.5 µg/L — CITY OF PRIMERA · 5,811 people · 2017 | 3/3 | SYR4 |
| Fluoride | 622.5 µg/L 16% of the EPA limit 4000 µg/L Main supplier: HARLINGEN WATER WORKS SYSTEM · 85,900 people · 2019 | 2/3 | SYR4 |
| Nitrate | 410.5 µg/L 4.1% of the EPA limit 10000 µg/L Main supplier: HARLINGEN WATER WORKS SYSTEM · 85,900 people · 2019 | 2/3 | SYR4 |
| Nitrate-Nitrite | 321 µg/L 3.2% of the EPA limit 10000 µg/L Highest in the ZIP: EAST RIO HONDO WSC · 24,756 people · 2019 | 1/3 | SYR4 |
| Barium | 135.6 µg/L 6.8% of the EPA limit 2000 µg/L Main supplier: HARLINGEN WATER WORKS SYSTEM · 85,900 people · 2019
Highest in the ZIP: 165.85 µg/L — EAST RIO HONDO WSC · 24,756 people · 2019 | 2/3 | SYR4 |
| Cyanide | 155 µg/L 78% of the EPA limit 200 µg/L Main supplier: HARLINGEN WATER WORKS SYSTEM · 85,900 people · 2019
Highest in the ZIP: 162.5 µg/L — EAST RIO HONDO WSC · 24,756 people · 2019 | 2/3 | SYR4 |
| Nitrite | 82 µg/L 8.2% of the EPA limit 1000 µg/L Highest in the ZIP: EAST RIO HONDO WSC · 24,756 people · 2019 | 1/3 | SYR4 |
| TTHM | 80.33 µg/L 100% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: HARLINGEN WATER WORKS SYSTEM · 85,900 people · 2019 | 3/3 | SYR4 |
| Lithium | 46.9 µg/L No EPA limit set Main supplier: HARLINGEN WATER WORKS SYSTEM · 85,900 people · 2024
Highest in the ZIP: 62.1 µg/L — CITY OF PRIMERA · 5,811 people · 2024 | 3/3 | UCMR-5 |
| Total Haloacetic Acids (HAA5) | 33.5 µg/L 56% of the EPA limit 60 µg/L Main supplier: HARLINGEN WATER WORKS SYSTEM · 85,900 people · 2019 | 3/3 | SYR4 |
| Bromoform | 27.4 µg/L No EPA limit set Main supplier: HARLINGEN WATER WORKS SYSTEM · 85,900 people · 2019
Highest in the ZIP: 27.67 µg/L — CITY OF PRIMERA · 5,811 people · 2019 | 3/3 | SYR4 |
| Dibromochloromethane | 26.6 µg/L No EPA limit set Main supplier: HARLINGEN WATER WORKS SYSTEM · 85,900 people · 2019
Highest in the ZIP: 27.16 µg/L — CITY OF PRIMERA · 5,811 people · 2019 | 3/3 | SYR4 |
| Bromodichloromethane | 18.4 µg/L No EPA limit set Main supplier: HARLINGEN WATER WORKS SYSTEM · 85,900 people · 2019 | 3/3 | SYR4 |
| Dibromoacetic Acid | 15.6 µg/L No EPA limit set Main supplier: HARLINGEN WATER WORKS SYSTEM · 85,900 people · 2019 | 3/3 | SYR4 |
| Dichloroacetic Acid | 11.18 µg/L No EPA limit set Main supplier: HARLINGEN WATER WORKS SYSTEM · 85,900 people · 2019
Highest in the ZIP: 12.12 µg/L — EAST RIO HONDO WSC · 24,756 people · 2019 | 3/3 | SYR4 |
| Chloroform | 11 µg/L No EPA limit set Main supplier: HARLINGEN WATER WORKS SYSTEM · 85,900 people · 2019 | 3/3 | SYR4 |
| Xylenes, Total | 9.95 µg/L 0.1% of the EPA limit 10000 µg/L Main supplier: HARLINGEN WATER WORKS SYSTEM · 85,900 people · 2019 | 1/3 | SYR4 |
| Monobromoacetic Acid | 9.72 µg/L No EPA limit set Main supplier: HARLINGEN WATER WORKS SYSTEM · 85,900 people · 2019 | 2/3 | SYR4 |
| Gross Beta Particle Activity | 6.91 pCi/L No EPA limit set Main supplier: HARLINGEN WATER WORKS SYSTEM · 85,900 people · 2017
Highest in the ZIP: 8.605 pCi/L — EAST RIO HONDO WSC · 24,756 people · 2018 | 2/3 | SYR4 |
| Monochloroacetic Acid | 6.8 µg/L No EPA limit set Main supplier: HARLINGEN WATER WORKS SYSTEM · 85,900 people · 2019 | 3/3 | SYR4 |
| Trichloroacetic Acid | 6.7 µg/L No EPA limit set Main supplier: HARLINGEN WATER WORKS SYSTEM · 85,900 people · 2019 | 3/3 | SYR4 |
| Lead | 4.8625 µg/L 32% of the EPA limit 15 µg/L Main supplier: HARLINGEN WATER WORKS SYSTEM · 85,900 people · 2018
Highest in the ZIP: 6.24 µg/L — CITY OF PRIMERA · 5,811 people · 2017 | 3/3 | SYR4 |
| Selenium | 5.375 µg/L 11% of the EPA limit 50 µg/L Main supplier: HARLINGEN WATER WORKS SYSTEM · 85,900 people · 2019 | 2/3 | SYR4 |
| Arsenic | 2.6 µg/L 26% of the EPA limit 10 µg/L Main supplier: HARLINGEN WATER WORKS SYSTEM · 85,900 people · 2019
Highest in the ZIP: 2.89 µg/L — EAST RIO HONDO WSC · 24,756 people · 2019 | 2/3 | SYR4 |
| Combined Uranium | 2.245 µg/L 7.5% of the EPA limit 30 µg/L Main supplier: HARLINGEN WATER WORKS SYSTEM · 85,900 people · 2017 | 1/3 | SYR4 |
| Combined Radium (-226 And -228) | 1.5 pCi/L 30% of the EPA limit 5 pCi/L Highest in the ZIP: EAST RIO HONDO WSC · 24,756 people · 2015 | 1/3 | SYR4 |
| Chromium | 1.418 µg/L 1.4% of the EPA limit 100 µg/L Highest in the ZIP: EAST RIO HONDO WSC · 24,756 people · 2019 | 1/3 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 1.095 µg/L 18% of the EPA limit 6 µg/L Main supplier: HARLINGEN WATER WORKS SYSTEM · 85,900 people · 2019
Highest in the ZIP: 1.4 µg/L — EAST RIO HONDO WSC · 24,756 people · 2019 | 2/3 | SYR4 |
| Ethylbenzene | 1.38 µg/L 0.2% of the EPA limit 700 µg/L Main supplier: HARLINGEN WATER WORKS SYSTEM · 85,900 people · 2019 | 1/3 | SYR4 |
| Carbon Tetrachloride | 0.6000 µg/L 12% of the EPA limit 5 µg/L Main supplier: HARLINGEN WATER WORKS SYSTEM · 85,900 people · 2019 | 1/3 | SYR4 |
| Vinyl Chloride | 0.6000 µg/L 30% of the EPA limit 2 µg/L Main supplier: HARLINGEN WATER WORKS SYSTEM · 85,900 people · 2019 | 1/3 | SYR4 |
| Antimony, Total | 0.5323 µg/L 8.9% of the EPA limit 6 µg/L Highest in the ZIP: EAST RIO HONDO WSC · 24,756 people · 2019 | 1/3 | SYR4 |
| Thallium, Total | 0.3741 µg/L 19% of the EPA limit 2 µg/L Highest in the ZIP: EAST RIO HONDO WSC · 24,756 people · 2019 | 1/3 | SYR4 |
| Atrazine | 0.1280 µg/L 4.3% of the EPA limit 3 µg/L Main supplier: HARLINGEN WATER WORKS SYSTEM · 85,900 people · 2019
Highest in the ZIP: 0.1800 µg/L — EAST RIO HONDO WSC · 24,756 people · 2019 | 2/3 | SYR4 |
| Pentachlorophenol | 0.1370 µg/L 14% of the EPA limit 1 µg/L Main supplier: HARLINGEN WATER WORKS SYSTEM · 85,900 people · 2019 | 1/3 | SYR4 |
| Pfba | 0.0088 µg/L No EPA limit set Main supplier: HARLINGEN WATER WORKS SYSTEM · 85,900 people · 2024
Highest in the ZIP: 0.0148 µg/L — EAST RIO HONDO WSC · 24,756 people · 2025 | 3/3 | UCMR-5 |
| Pfpea | 0.0030 µg/L No EPA limit set Main supplier: HARLINGEN WATER WORKS SYSTEM · 85,900 people · 2024
Highest in the ZIP: 0.0117 µg/L — EAST RIO HONDO WSC · 24,756 people · 2025 | 3/3 | UCMR-5 |
| Pfhxa | 0.0030 µg/L No EPA limit set Main supplier: HARLINGEN WATER WORKS SYSTEM · 85,900 people · 2024
Highest in the ZIP: 0.0112 µg/L — EAST RIO HONDO WSC · 24,756 people · 2025 | 3/3 | UCMR-5 |
| PFBS | 0.0104 µg/L No EPA limit set Highest in the ZIP: CITY OF PRIMERA · 5,811 people · 2025 | 2/3 | UCMR-5 |
| PFOS | 0.0056 µg/L No EPA limit set Highest in the ZIP: EAST RIO HONDO WSC · 24,756 people · 2025 | 1/3 | UCMR-5 |
| PFOA | 0.0054 µg/L No EPA limit set Highest in the ZIP: EAST RIO HONDO WSC · 24,756 people · 2025 | 1/3 | UCMR-5 |
| PFHXS | 0.0045 µg/L No EPA limit set Highest in the ZIP: EAST RIO HONDO WSC · 24,756 people · 2025 | 2/3 | UCMR-5 |
| Pfhpa | 0.0040 µg/L No EPA limit set Highest in the ZIP: EAST RIO HONDO WSC · 24,756 people · 2025 | 1/3 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: HARLINGEN WATER WORKS SYSTEM · 85,900 people · 2024 | 3/3 | 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.
Water suppliers serving ZIP 78552
| Supplier | State | Population served |
|---|---|---|
| HARLINGEN WATER WORKS SYSTEM | TX | 85,900 |
| EAST RIO HONDO WSC | TX | 24,756 |
| CITY OF PRIMERA | TX | 5,811 |
Frequently asked questions about ZIP 78552 tap water
Is the tap water in ZIP 78552 safe to drink?
EPA testing detected 45 contaminants across the water suppliers serving ZIP 78552. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and your utility's annual Consumer Confidence Report for the official status.
Which water suppliers serve ZIP 78552?
3 public water suppliers report EPA drinking-water monitoring for ZIP 78552. Each is listed above with its population served.
What contaminants are in ZIP 78552's water?
EPA monitoring detected Chlorite, Copper, Fluoride, Nitrate, Nitrate-Nitrite, and others across this ZIP's suppliers. The full list with levels and sources is above.