What was found in ZIP 78155
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 | 2190 µg/L 22% of the EPA limit 10000 µg/L Main supplier: GREEN VALLEY SUD · 52,497 people · 2019 | 3/3 | SYR4 |
| Nitrate-Nitrite | 2082 µg/L 21% of the EPA limit 10000 µg/L Main supplier: GREEN VALLEY SUD · 52,497 people · 2015 | 3/3 | SYR4 |
| Fluoride | 729 µg/L 18% of the EPA limit 4000 µg/L Main supplier: GREEN VALLEY SUD · 52,497 people · 2019 | 3/3 | SYR4 |
| Copper | 280 µg/L 22% of the EPA limit 1300 µg/L Main supplier: GREEN VALLEY SUD · 52,497 people · 2019
Highest in the ZIP: 375.99999999999966 µg/L — SPRINGS HILL SUD · 35,541 people · 2019 | 3/3 | SYR4 |
| Barium | 41.18 µg/L 2.1% of the EPA limit 2000 µg/L Main supplier: GREEN VALLEY SUD · 52,497 people · 2019
Highest in the ZIP: 109 µg/L — SPRINGS HILL SUD · 35,541 people · 2019 | 3/3 | SYR4 |
| TTHM | 23.950000000000003 µg/L 30% of the EPA limit 80 µg/L Main supplier: GREEN VALLEY SUD · 52,497 people · 2019
Highest in the ZIP: 103.94 µg/L — SPRINGS HILL SUD · 35,541 people · 2019 | 3/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 19.62999999999999 µg/L 33% of the EPA limit 60 µg/L Main supplier: GREEN VALLEY SUD · 52,497 people · 2019
Highest in the ZIP: 58.35999999999997 µg/L — SPRINGS HILL SUD · 35,541 people · 2019 | 3/3 | SYR4 |
| Chloroform | 11.499999999999998 µg/L No EPA limit set Main supplier: GREEN VALLEY SUD · 52,497 people · 2019
Highest in the ZIP: 56.8 µg/L — SPRINGS HILL SUD · 35,541 people · 2019 | 3/3 | SYR4 |
| Lithium | 41 µg/L No EPA limit set Main supplier: GREEN VALLEY SUD · 52,497 people · 2023 | 3/3 | UCMR-5 |
| Dichloroacetic Acid | 13.039999999999996 µg/L No EPA limit set Main supplier: GREEN VALLEY SUD · 52,497 people · 2019
Highest in the ZIP: 38.88999999999999 µg/L — SPRINGS HILL SUD · 35,541 people · 2019 | 3/3 | SYR4 |
| Bromodichloromethane | 7.579999999999998 µg/L No EPA limit set Main supplier: GREEN VALLEY SUD · 52,497 people · 2019
Highest in the ZIP: 37.61 µg/L — SPRINGS HILL SUD · 35,541 people · 2019 | 3/3 | SYR4 |
| Trichloroacetic Acid | 4.855000000000003 µg/L No EPA limit set Main supplier: GREEN VALLEY SUD · 52,497 people · 2019
Highest in the ZIP: 25.024999999999988 µg/L — CITY OF SEGUIN · 32,736 people · 2019 | 3/3 | SYR4 |
| Dibromochloromethane | 8.66999999999997 µg/L No EPA limit set Main supplier: GREEN VALLEY SUD · 52,497 people · 2019
Highest in the ZIP: 22.86 µg/L — SPRINGS HILL SUD · 35,541 people · 2019 | 3/3 | SYR4 |
| Lead | 6.385 µg/L 43% of the EPA limit 15 µg/L Main supplier: GREEN VALLEY SUD · 52,497 people · 2019
Highest in the ZIP: 20.919999999999998 µg/L — SPRINGS HILL SUD · 35,541 people · 2019 | 3/3 | SYR4 |
| Gross Beta Particle Activity | 9.870000000000001 pCi/L No EPA limit set Highest in the ZIP: SPRINGS HILL SUD · 35,541 people · 2017 | 2/3 | SYR4 |
| Bromoform | 5.644999999999996 µg/L No EPA limit set Main supplier: GREEN VALLEY SUD · 52,497 people · 2019
Highest in the ZIP: 8.8 µg/L — SPRINGS HILL SUD · 35,541 people · 2019 | 3/3 | SYR4 |
| Monochloroacetic Acid | 7.4449999999999985 µg/L No EPA limit set Main supplier: GREEN VALLEY SUD · 52,497 people · 2019
Highest in the ZIP: 8.58 µg/L — SPRINGS HILL SUD · 35,541 people · 2019 | 3/3 | SYR4 |
| Monobromoacetic Acid | 8.204999999999998 µg/L No EPA limit set Main supplier: GREEN VALLEY SUD · 52,497 people · 2019 | 3/3 | SYR4 |
| Dibromoacetic Acid | 5.244999999999999 µg/L No EPA limit set Main supplier: GREEN VALLEY SUD · 52,497 people · 2019
Highest in the ZIP: 8.1 µg/L — SPRINGS HILL SUD · 35,541 people · 2019 | 3/3 | SYR4 |
| Xylenes, Total | 7.799999999999997 µg/L 0.1% of the EPA limit 10000 µg/L Main supplier: GREEN VALLEY SUD · 52,497 people · 2019 | 2/3 | SYR4 |
| Gross Alpha, Excl. Radon And U | 5.865 pCi/L 39% of the EPA limit 15 pCi/L Highest in the ZIP: SPRINGS HILL SUD · 35,541 people · 2017 | 2/3 | SYR4 |
| Combined Radium (-226 And -228) | 3.1 pCi/L 62% of the EPA limit 5 pCi/L Highest in the ZIP: CITY OF SEGUIN · 32,736 people · 2017 | 2/3 | SYR4 |
| Dalapon | 1.685 µg/L 0.8% of the EPA limit 200 µg/L Highest in the ZIP: CITY OF SEGUIN · 32,736 people · 2019 | 2/3 | SYR4 |
| Ethylbenzene | 1.16 µg/L 0.2% of the EPA limit 700 µg/L Main supplier: GREEN VALLEY SUD · 52,497 people · 2019 | 1/3 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 0.9200 µg/L 15% of the EPA limit 6 µg/L Main supplier: GREEN VALLEY SUD · 52,497 people · 2019 | 1/3 | SYR4 |
| Atrazine | 0.8505 µg/L 28% of the EPA limit 3 µg/L Highest in the ZIP: CITY OF SEGUIN · 32,736 people · 2019 | 1/3 | SYR4 |
| Pfba | 0.0097 µg/L No EPA limit set Highest in the ZIP: CITY OF SEGUIN · 32,736 people · 2024 | 2/3 | UCMR-5 |
| Pfpea | 0.0049 µg/L No EPA limit set Main supplier: GREEN VALLEY SUD · 52,497 people · 2023 | 3/3 | UCMR-5 |
| PFOS | 0.0044 µg/L No EPA limit set Highest in the ZIP: SPRINGS HILL SUD · 35,541 people · 2024 | 1/3 | UCMR-5 |
| Lead | 0.0018 mg/L 12% of the EPA limit 0.0150 mg/L Main supplier: GREEN VALLEY SUD · 52,497 people · 2025 | 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 78155
| Supplier | State | Population served |
|---|---|---|
| GREEN VALLEY SUD | TX | 52,497 |
| SPRINGS HILL SUD | TX | 35,541 |
| CITY OF SEGUIN | TX | 32,736 |
Frequently asked questions about ZIP 78155 tap water
Is the tap water in ZIP 78155 safe to drink?
EPA testing detected 30 contaminants across the water suppliers serving ZIP 78155. 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 78155?
3 public water suppliers report EPA drinking-water monitoring for ZIP 78155. Each is listed above with its population served.
What contaminants are in ZIP 78155's water?
EPA monitoring detected Nitrate, Nitrate-Nitrite, Fluoride, Copper, Barium, and others across this ZIP's suppliers. The full list with levels and sources is above.