What was found in ZIP 78140
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 | 1750 µg/L 18% of the EPA limit 10000 µg/L Main supplier: GONZALES COUNTY WSC · 10,350 people · 2019
Highest in the ZIP: 3315 µg/L — EL OSO WSC · 6,288 people · 2019 | 2/2 | SYR4 |
| Nitrate-Nitrite | 976 µg/L 9.8% of the EPA limit 10000 µg/L Main supplier: GONZALES COUNTY WSC · 10,350 people · 2015
Highest in the ZIP: 2886 µg/L — EL OSO WSC · 6,288 people · 2015 | 2/2 | SYR4 |
| Fluoride | 220 µg/L 5.5% of the EPA limit 4000 µg/L Main supplier: GONZALES COUNTY WSC · 10,350 people · 2019
Highest in the ZIP: 998.5 µg/L — EL OSO WSC · 6,288 people · 2017 | 2/2 | SYR4 |
| Barium | 257.5 µg/L 13% of the EPA limit 2000 µg/L Main supplier: GONZALES COUNTY WSC · 10,350 people · 2019 | 2/2 | SYR4 |
| Copper | 240 µg/L 18% of the EPA limit 1300 µg/L Main supplier: GONZALES COUNTY WSC · 10,350 people · 2018 | 2/2 | SYR4 |
| Chloroform | 179.65 µg/L No EPA limit set Main supplier: GONZALES COUNTY WSC · 10,350 people · 2019 | 2/2 | SYR4 |
| TTHM | 45.305 µg/L 57% of the EPA limit 80 µg/L Main supplier: GONZALES COUNTY WSC · 10,350 people · 2019
Highest in the ZIP: 104.25 µg/L — EL OSO WSC · 6,288 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 102.56 µg/L 171% of the EPA limit, at the 95th percentile of samples — 60 µg/L Main supplier: GONZALES COUNTY WSC · 10,350 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 87.385 µg/L No EPA limit set Main supplier: GONZALES COUNTY WSC · 10,350 people · 2019 | 2/2 | SYR4 |
| Lithium | 50.7 µg/L No EPA limit set Main supplier: GONZALES COUNTY WSC · 10,350 people · 2023
Highest in the ZIP: 76.5 µg/L — EL OSO WSC · 6,288 people · 2024 | 2/2 | UCMR-5 |
| Cyanide | 67.5 µg/L 34% of the EPA limit 200 µg/L Main supplier: GONZALES COUNTY WSC · 10,350 people · 2019 | 1/2 | SYR4 |
| Trichloroacetic Acid | 59.35 µg/L No EPA limit set Main supplier: GONZALES COUNTY WSC · 10,350 people · 2019 | 2/2 | SYR4 |
| Bromoform | 3.78 µg/L No EPA limit set Main supplier: GONZALES COUNTY WSC · 10,350 people · 2019
Highest in the ZIP: 47.06 µg/L — EL OSO WSC · 6,288 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 42 µg/L No EPA limit set Main supplier: GONZALES COUNTY WSC · 10,350 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 16.1 µg/L No EPA limit set Main supplier: GONZALES COUNTY WSC · 10,350 people · 2019
Highest in the ZIP: 38.04 µg/L — EL OSO WSC · 6,288 people · 2019 | 2/2 | SYR4 |
| Dibromoacetic Acid | 4.58 µg/L No EPA limit set Main supplier: GONZALES COUNTY WSC · 10,350 people · 2019
Highest in the ZIP: 13.56 µg/L — EL OSO WSC · 6,288 people · 2019 | 2/2 | SYR4 |
| Arsenic | 2.4 µg/L 24% of the EPA limit 10 µg/L Main supplier: GONZALES COUNTY WSC · 10,350 people · 2019
Highest in the ZIP: 13.32 µg/L — EL OSO WSC · 6,288 people · 2019 | 2/2 | SYR4 |
| Gross Beta Particle Activity | 13.065 pCi/L No EPA limit set Main supplier: GONZALES COUNTY WSC · 10,350 people · 2018 | 2/2 | SYR4 |
| Lead | 12.655 µg/L 84% of the EPA limit 15 µg/L Main supplier: GONZALES COUNTY WSC · 10,350 people · 2018 | 2/2 | SYR4 |
| Monochloroacetic Acid | 10.535 µg/L No EPA limit set Main supplier: GONZALES COUNTY WSC · 10,350 people · 2019 | 2/2 | SYR4 |
| Combined Uranium | 5.2 µg/L 17% of the EPA limit 30 µg/L Highest in the ZIP: EL OSO WSC · 6,288 people · 2016 | 1/2 | SYR4 |
| Gross Alpha, Excl. Radon And U | 5.015 pCi/L 33% of the EPA limit 15 pCi/L Main supplier: GONZALES COUNTY WSC · 10,350 people · 2018 | 2/2 | SYR4 |
| Selenium | 3.48 µg/L 7% of the EPA limit 50 µg/L Highest in the ZIP: EL OSO WSC · 6,288 people · 2017 | 1/2 | SYR4 |
| Combined Radium (-226 And -228) | 3.35 pCi/L 67% of the EPA limit 5 pCi/L Main supplier: GONZALES COUNTY WSC · 10,350 people · 2018 | 1/2 | SYR4 |
| Monobromoacetic Acid | 2.615 µg/L No EPA limit set Main supplier: GONZALES COUNTY WSC · 10,350 people · 2019
Highest in the ZIP: 3.05 µg/L — EL OSO WSC · 6,288 people · 2019 | 2/2 | SYR4 |
| Xylenes, Total | 1.009 µg/L 0% of the EPA limit 10000 µg/L Main supplier: GONZALES COUNTY WSC · 10,350 people · 2019 | 2/2 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 0.9300 µg/L 16% of the EPA limit 6 µg/L Main supplier: GONZALES COUNTY WSC · 10,350 people · 2019 | 1/2 | SYR4 |
| Styrene | 0.5000 µg/L 0.5% of the EPA limit 100 µg/L Highest in the ZIP: EL OSO WSC · 6,288 people · 2019 | 1/2 | SYR4 |
| Hexachlorocyclopentadiene | 0.2300 µg/L 0.5% of the EPA limit 50 µg/L Main supplier: GONZALES COUNTY WSC · 10,350 people · 2019 | 1/2 | SYR4 |
| Atrazine | 0.1400 µg/L 4.7% of the EPA limit 3 µg/L Main supplier: GONZALES COUNTY WSC · 10,350 people · 2019 | 1/2 | SYR4 |
| Pfba | 0.0061 µg/L No EPA limit set Main supplier: GONZALES COUNTY WSC · 10,350 people · 2024 | 1/2 | UCMR-5 |
| Pfpea | 0.0041 µg/L No EPA limit set Main supplier: GONZALES COUNTY WSC · 10,350 people · 2024 | 1/2 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: GONZALES COUNTY WSC · 10,350 people · 2024
Highest in the ZIP: 0.0014 mg/L — EL OSO WSC · 6,288 people · 2023 | 2/2 | 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 78140
| Supplier | State | Population served |
|---|---|---|
| GONZALES COUNTY WSC | TX | 10,350 |
| EL OSO WSC | TX | 6,288 |
Frequently asked questions about ZIP 78140 tap water
Is the tap water in ZIP 78140 safe to drink?
EPA testing detected 33 contaminants across the water suppliers serving ZIP 78140. 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 78140?
2 public water suppliers report EPA drinking-water monitoring for ZIP 78140. Each is listed above with its population served.
What contaminants are in ZIP 78140's water?
EPA monitoring detected Nitrate, Nitrate-Nitrite, Fluoride, Barium, Copper, and others across this ZIP's suppliers. The full list with levels and sources is above.