What was found in ZIP 79928
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 | 6776 µg/L 68% of the EPA limit 10000 µg/L Highest in the ZIP: HORIZON REGIONAL MUD · 31,542 people · 2019 | 1/4 | SYR4 |
| Nitrate | 6740 µg/L 67% of the EPA limit 10000 µg/L Highest in the ZIP: HORIZON REGIONAL MUD · 31,542 people · 2019 | 1/4 | SYR4 |
| Fluoride | 725.7 µg/L 18% of the EPA limit 4000 µg/L Highest in the ZIP: HORIZON REGIONAL MUD · 31,542 people · 2018 | 1/4 | SYR4 |
| Copper | 430 µg/L 33% of the EPA limit 1300 µg/L Main supplier: LOWER VALLEY WATER DISTRICT · 59,049 people · 2018
Highest in the ZIP: 588 µg/L — EAST MONTANA WATER SYSTEM · 11,480 people · 2017 | 4/4 | SYR4 |
| Lithium | 75.7 µg/L No EPA limit set Main supplier: LOWER VALLEY WATER DISTRICT · 59,049 people · 2024
Highest in the ZIP: 107 µg/L — PASEO DEL ESTE MUD 1 · 36,773 people · 2025 | 4/4 | UCMR-5 |
| TTHM | 96.72 µg/L 121% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: LOWER VALLEY WATER DISTRICT · 59,049 people · 2019
Highest in the ZIP: 101.35 µg/L — PASEO DEL ESTE MUD 1 · 36,773 people · 2019 | 4/4 | SYR4 |
| Chloroform | 31.125 µg/L No EPA limit set Main supplier: LOWER VALLEY WATER DISTRICT · 59,049 people · 2019
Highest in the ZIP: 41.4 µg/L — EAST MONTANA WATER SYSTEM · 11,480 people · 2019 | 3/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 31.55 µg/L 53% of the EPA limit 60 µg/L Main supplier: LOWER VALLEY WATER DISTRICT · 59,049 people · 2019
Highest in the ZIP: 39.96 µg/L — EAST MONTANA WATER SYSTEM · 11,480 people · 2019 | 4/4 | SYR4 |
| Bromoform | 15.08 µg/L No EPA limit set Main supplier: LOWER VALLEY WATER DISTRICT · 59,049 people · 2019
Highest in the ZIP: 36.125 µg/L — HORIZON REGIONAL MUD · 31,542 people · 2019 | 4/4 | SYR4 |
| Dibromochloromethane | 35.52 µg/L No EPA limit set Main supplier: LOWER VALLEY WATER DISTRICT · 59,049 people · 2019 | 4/4 | SYR4 |
| Bromodichloromethane | 31.585 µg/L No EPA limit set Main supplier: LOWER VALLEY WATER DISTRICT · 59,049 people · 2019
Highest in the ZIP: 33.96 µg/L — PASEO DEL ESTE MUD 1 · 36,773 people · 2019 | 4/4 | SYR4 |
| Barium | 31.1 µg/L 1.6% of the EPA limit 2000 µg/L Highest in the ZIP: HORIZON REGIONAL MUD · 31,542 people · 2018 | 1/4 | SYR4 |
| Dichloroacetic Acid | 14.18 µg/L No EPA limit set Main supplier: LOWER VALLEY WATER DISTRICT · 59,049 people · 2019
Highest in the ZIP: 20.35 µg/L — PASEO DEL ESTE MUD 1 · 36,773 people · 2019 | 4/4 | SYR4 |
| Lead | 17.415 µg/L 116% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: LOWER VALLEY WATER DISTRICT · 59,049 people · 2018 | 4/4 | SYR4 |
| Arsenic | 15.15 µg/L 152% of the EPA limit, at the 95th percentile of samples — 10 µg/L Highest in the ZIP: HORIZON REGIONAL MUD · 31,542 people · 2018 | 1/4 | SYR4 |
| Trichloroacetic Acid | 8.125 µg/L No EPA limit set Main supplier: LOWER VALLEY WATER DISTRICT · 59,049 people · 2019
Highest in the ZIP: 12.39 µg/L — EAST MONTANA WATER SYSTEM · 11,480 people · 2019 | 3/4 | SYR4 |
| Dibromoacetic Acid | 11.67 µg/L No EPA limit set Main supplier: LOWER VALLEY WATER DISTRICT · 59,049 people · 2019 | 4/4 | SYR4 |
| Monochloroacetic Acid | 4.4 µg/L No EPA limit set Main supplier: LOWER VALLEY WATER DISTRICT · 59,049 people · 2019
Highest in the ZIP: 10.625 µg/L — HORIZON REGIONAL MUD · 31,542 people · 2019 | 4/4 | SYR4 |
| Selenium | 9.7 µg/L 19% of the EPA limit 50 µg/L Highest in the ZIP: HORIZON REGIONAL MUD · 31,542 people · 2018 | 1/4 | SYR4 |
| Chromium | 7.14 µg/L 7.1% of the EPA limit 100 µg/L Highest in the ZIP: HORIZON REGIONAL MUD · 31,542 people · 2018 | 1/4 | SYR4 |
| Gross Beta Particle Activity | 6.435 pCi/L No EPA limit set Highest in the ZIP: HORIZON REGIONAL MUD · 31,542 people · 2015 | 1/4 | SYR4 |
| Combined Uranium | 4.43 µg/L 15% of the EPA limit 30 µg/L Highest in the ZIP: HORIZON REGIONAL MUD · 31,542 people · 2015 | 1/4 | SYR4 |
| Gross Alpha, Excl. Radon And U | 3.95 pCi/L 26% of the EPA limit 15 pCi/L Highest in the ZIP: HORIZON REGIONAL MUD · 31,542 people · 2015 | 1/4 | SYR4 |
| Monobromoacetic Acid | 2.435 µg/L No EPA limit set Main supplier: LOWER VALLEY WATER DISTRICT · 59,049 people · 2019
Highest in the ZIP: 2.91 µg/L — EAST MONTANA WATER SYSTEM · 11,480 people · 2019 | 4/4 | SYR4 |
| Pfpea | 0.0033 µg/L No EPA limit set Main supplier: LOWER VALLEY WATER DISTRICT · 59,049 people · 2024
Highest in the ZIP: 0.0060 µg/L — EAST MONTANA WATER SYSTEM · 11,480 people · 2023 | 2/4 | UCMR-5 |
| Pfba | 0.0053 µg/L No EPA limit set Main supplier: LOWER VALLEY WATER DISTRICT · 59,049 people · 2024
Highest in the ZIP: 0.0057 µg/L — EAST MONTANA WATER SYSTEM · 11,480 people · 2023 | 2/4 | UCMR-5 |
| Pfhxa | 0.0034 µg/L No EPA limit set Main supplier: LOWER VALLEY WATER DISTRICT · 59,049 people · 2024
Highest in the ZIP: 0.0043 µg/L — EAST MONTANA WATER SYSTEM · 11,480 people · 2023 | 2/4 | UCMR-5 |
| PFBS | 0.0036 µg/L No EPA limit set Highest in the ZIP: PASEO DEL ESTE MUD 1 · 36,773 people · 2025 | 2/4 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: LOWER VALLEY WATER DISTRICT · 59,049 people · 2025
Highest in the ZIP: 0.0025 mg/L — PASEO DEL ESTE MUD 1 · 36,773 people · 2023 | 4/4 | 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 79928
| Supplier | State | Population served |
|---|---|---|
| LOWER VALLEY WATER DISTRICT | TX | 59,049 |
| PASEO DEL ESTE MUD 1 | TX | 36,773 |
| HORIZON REGIONAL MUD | TX | 31,542 |
| EAST MONTANA WATER SYSTEM | TX | 11,480 |
Frequently asked questions about ZIP 79928 tap water
Is the tap water in ZIP 79928 safe to drink?
EPA testing detected 29 contaminants across the water suppliers serving ZIP 79928. 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 79928?
4 public water suppliers report EPA drinking-water monitoring for ZIP 79928. Each is listed above with its population served.
What contaminants are in ZIP 79928's water?
EPA monitoring detected Nitrate-Nitrite, Nitrate, Fluoride, Copper, Lithium, and others across this ZIP's suppliers. The full list with levels and sources is above.