What was found in ZIP 78570
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 |
|---|---|---|---|
| Nitrate-Nitrite | 1628 µg/L 16% of the EPA limit 10000 µg/L Main supplier: NORTH ALAMO WSC · 171,195 people · 2019 | 1/2 | SYR4 |
| Fluoride | 600 µg/L 15% of the EPA limit 4000 µg/L Main supplier: NORTH ALAMO WSC · 171,195 people · 2019
Highest in the ZIP: 1056.9999999999998 µg/L — CITY OF MERCEDES · 16,258 people · 2019 | 2/2 | SYR4 |
| Copper | 309.7999999999998 µg/L 24% of the EPA limit 1300 µg/L Main supplier: NORTH ALAMO WSC · 171,195 people · 2019
Highest in the ZIP: 896.9999999999905 µg/L — CITY OF MERCEDES · 16,258 people · 2017 | 2/2 | SYR4 |
| Nitrate | 555 µg/L 5.6% of the EPA limit 10000 µg/L Main supplier: NORTH ALAMO WSC · 171,195 people · 2019
Highest in the ZIP: 860 µg/L — CITY OF MERCEDES · 16,258 people · 2019 | 2/2 | SYR4 |
| Chlorite | 532.5999999999999 µg/L 53% of the EPA limit 1000 µg/L Main supplier: NORTH ALAMO WSC · 171,195 people · 2019 | 1/2 | SYR4 |
| Cyanide | 150 µg/L 75% of the EPA limit 200 µg/L Main supplier: NORTH ALAMO WSC · 171,195 people · 2019 | 2/2 | SYR4 |
| Barium | 127.85 µg/L 6.4% of the EPA limit 2000 µg/L Main supplier: NORTH ALAMO WSC · 171,195 people · 2019 | 2/2 | SYR4 |
| TTHM | 75.02 µg/L 94% of the EPA limit 80 µg/L Main supplier: NORTH ALAMO WSC · 171,195 people · 2019
Highest in the ZIP: 103.34999999999994 µg/L — CITY OF MERCEDES · 16,258 people · 2019 | 2/2 | SYR4 |
| Lithium | 50 µg/L No EPA limit set Main supplier: NORTH ALAMO WSC · 171,195 people · 2023
Highest in the ZIP: 61.4 µg/L — CITY OF MERCEDES · 16,258 people · 2023 | 2/2 | UCMR-5 |
| Nitrite | 49 µg/L 4.9% of the EPA limit 1000 µg/L Main supplier: NORTH ALAMO WSC · 171,195 people · 2019 | 1/2 | SYR4 |
| Bromoform | 24.04 µg/L No EPA limit set Main supplier: NORTH ALAMO WSC · 171,195 people · 2019
Highest in the ZIP: 37.845 µg/L — CITY OF MERCEDES · 16,258 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 24.905 µg/L No EPA limit set Main supplier: NORTH ALAMO WSC · 171,195 people · 2019
Highest in the ZIP: 35.77800000000001 µg/L — CITY OF MERCEDES · 16,258 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 34.80499999999999 µg/L 58% of the EPA limit 60 µg/L Main supplier: NORTH ALAMO WSC · 171,195 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 19.05000000000001 µg/L No EPA limit set Main supplier: NORTH ALAMO WSC · 171,195 people · 2019
Highest in the ZIP: 24.135000000000005 µg/L — CITY OF MERCEDES · 16,258 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 14.975000000000001 µg/L No EPA limit set Main supplier: NORTH ALAMO WSC · 171,195 people · 2019
Highest in the ZIP: 17.549999999999994 µg/L — CITY OF MERCEDES · 16,258 people · 2019 | 2/2 | SYR4 |
| Monobromoacetic Acid | 9.459999999999997 µg/L No EPA limit set Main supplier: NORTH ALAMO WSC · 171,195 people · 2019
Highest in the ZIP: 17.3 µg/L — CITY OF MERCEDES · 16,258 people · 2019 | 2/2 | SYR4 |
| Lead | 9.602 µg/L 64% of the EPA limit 15 µg/L Main supplier: NORTH ALAMO WSC · 171,195 people · 2019
Highest in the ZIP: 15.199999999999996 µg/L — CITY OF MERCEDES · 16,258 people · 2017 | 2/2 | SYR4 |
| Dichloroacetic Acid | 13.809999999999997 µg/L No EPA limit set Main supplier: NORTH ALAMO WSC · 171,195 people · 2019 | 2/2 | SYR4 |
| Monochloroacetic Acid | 9.259999999999998 µg/L No EPA limit set Main supplier: NORTH ALAMO WSC · 171,195 people · 2019
Highest in the ZIP: 12.999999999999993 µg/L — CITY OF MERCEDES · 16,258 people · 2019 | 2/2 | SYR4 |
| Chloroform | 9.494999999999994 µg/L No EPA limit set Main supplier: NORTH ALAMO WSC · 171,195 people · 2019
Highest in the ZIP: 12.390000000000004 µg/L — CITY OF MERCEDES · 16,258 people · 2019 | 2/2 | SYR4 |
| Gross Beta Particle Activity | 8.375 pCi/L No EPA limit set Main supplier: NORTH ALAMO WSC · 171,195 people · 2017 | 2/2 | SYR4 |
| Trichloroacetic Acid | 6.679999999999995 µg/L No EPA limit set Main supplier: NORTH ALAMO WSC · 171,195 people · 2019
Highest in the ZIP: 7.1 µg/L — CITY OF MERCEDES · 16,258 people · 2019 | 2/2 | SYR4 |
| Arsenic | 6.1 µg/L 61% of the EPA limit 10 µg/L Main supplier: NORTH ALAMO WSC · 171,195 people · 2019 | 2/2 | SYR4 |
| Selenium | 5.1 µg/L 10% of the EPA limit 50 µg/L Main supplier: NORTH ALAMO WSC · 171,195 people · 2019
Highest in the ZIP: 5.1899999999999995 µg/L — CITY OF MERCEDES · 16,258 people · 2019 | 2/2 | SYR4 |
| Gross Alpha, Excl. Radon And U | 3 pCi/L 20% of the EPA limit 15 pCi/L Main supplier: NORTH ALAMO WSC · 171,195 people · 2017 | 1/2 | SYR4 |
| Combined Uranium | 2.6199999999999997 µg/L 8.7% of the EPA limit 30 µg/L Main supplier: NORTH ALAMO WSC · 171,195 people · 2017 | 1/2 | SYR4 |
| Carbon Tetrachloride | 1.9 µg/L 38% of the EPA limit 5 µg/L Highest in the ZIP: CITY OF MERCEDES · 16,258 people · 2019 | 1/2 | SYR4 |
| Combined Radium (-226 And -228) | 1.5 pCi/L 30% of the EPA limit 5 pCi/L Main supplier: NORTH ALAMO WSC · 171,195 people · 2017 | 2/2 | SYR4 |
| Dichloromethane | 1.4849999999999999 µg/L 30% of the EPA limit 5 µg/L Main supplier: NORTH ALAMO WSC · 171,195 people · 2019 | 1/2 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 0.7900 µg/L 13% of the EPA limit 6 µg/L Main supplier: NORTH ALAMO WSC · 171,195 people · 2019 | 1/2 | SYR4 |
| Atrazine | 0.1100 µg/L 3.7% of the EPA limit 3 µg/L Main supplier: NORTH ALAMO WSC · 171,195 people · 2019
Highest in the ZIP: 0.1400 µg/L — CITY OF MERCEDES · 16,258 people · 2019 | 2/2 | SYR4 |
| Pfba | 0.0122 µg/L No EPA limit set Main supplier: NORTH ALAMO WSC · 171,195 people · 2023 | 1/2 | UCMR-5 |
| Pfpea | 0.0038 µg/L No EPA limit set Main supplier: NORTH ALAMO WSC · 171,195 people · 2023 | 1/2 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: NORTH ALAMO WSC · 171,195 people · 2023
Highest in the ZIP: 0.0037 mg/L — CITY OF MERCEDES · 16,258 people · 2025 | 2/2 | LCR |
| Pfhxa | 0.0035 µg/L No EPA limit set Main supplier: NORTH ALAMO WSC · 171,195 people · 2023 | 2/2 | UCMR-5 |
| PFHXS | 0.0034 µg/L No EPA limit set Main supplier: NORTH ALAMO WSC · 171,195 people · 2023 | 1/2 | UCMR-5 |
| PFBS | 0.0030 µg/L No EPA limit set Main supplier: NORTH ALAMO WSC · 171,195 people · 2023 | 1/2 | UCMR-5 |
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 78570
| Supplier | State | Population served |
|---|---|---|
| NORTH ALAMO WSC | TX | 171,195 |
| CITY OF MERCEDES | TX | 16,258 |
Frequently asked questions about ZIP 78570 tap water
Is the tap water in ZIP 78570 safe to drink?
EPA testing detected 37 contaminants across the water suppliers serving ZIP 78570. 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 78570?
2 public water suppliers report EPA drinking-water monitoring for ZIP 78570. Each is listed above with its population served.
What contaminants are in ZIP 78570's water?
EPA monitoring detected Nitrate-Nitrite, Fluoride, Copper, Nitrate, Chlorite, and others across this ZIP's suppliers. The full list with levels and sources is above.