What was found in ZIP 78023
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 | 2440 µg/L 24% of the EPA limit 10000 µg/L Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2019 | 1/1 | SYR4 |
| Nitrate-Nitrite | 2369 µg/L 24% of the EPA limit 10000 µg/L Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2019 | 1/1 | SYR4 |
| Fluoride | 834 µg/L 21% of the EPA limit 4000 µg/L Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2019 | 1/1 | SYR4 |
| Copper | 289 µg/L 22% of the EPA limit 1300 µg/L Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2018 | 1/1 | SYR4 |
| Barium | 115.7 µg/L 5.8% of the EPA limit 2000 µg/L Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2019 | 1/1 | SYR4 |
| TTHM | 72.65 µg/L 91% of the EPA limit 80 µg/L Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2019 | 1/1 | SYR4 |
| Lithium | 25.5 µg/L No EPA limit set Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2025 | 1/1 | UCMR-5 |
| Chloroform | 25.1 µg/L No EPA limit set Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2019 | 1/1 | SYR4 |
| Bromodichloromethane | 23.8 µg/L No EPA limit set Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2019 | 1/1 | SYR4 |
| Dibromochloromethane | 22.07 µg/L No EPA limit set Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2019 | 1/1 | SYR4 |
| Total Haloacetic Acids (HAA5) | 18.9 µg/L 32% of the EPA limit 60 µg/L Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2019 | 1/1 | SYR4 |
| Gross Beta Particle Activity | 11.525 pCi/L No EPA limit set Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2019 | 1/1 | SYR4 |
| Dichloroacetic Acid | 9.8 µg/L No EPA limit set Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2019 | 1/1 | SYR4 |
| Bromoform | 8.245 µg/L No EPA limit set Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2019 | 1/1 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 6.74 µg/L 112% of the EPA limit, at the 95th percentile of samples — 6 µg/L Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2019 | 1/1 | SYR4 |
| Dibromoacetic Acid | 6.6 µg/L No EPA limit set Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2019 | 1/1 | SYR4 |
| Lead | 6.178 µg/L 41% of the EPA limit 15 µg/L Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2018 | 1/1 | SYR4 |
| Trichloroacetic Acid | 5.6 µg/L No EPA limit set Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2019 | 1/1 | SYR4 |
| Gross Alpha, Excl. Radon And U | 5.245 pCi/L 35% of the EPA limit 15 pCi/L Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2019 | 1/1 | SYR4 |
| Selenium | 4.36 µg/L 8.7% of the EPA limit 50 µg/L Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2019 | 1/1 | SYR4 |
| Chromium | 4.146 µg/L 4.1% of the EPA limit 100 µg/L Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2019 | 1/1 | SYR4 |
| Xylenes, Total | 3.5555 µg/L 0% of the EPA limit 10000 µg/L Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2019 | 1/1 | SYR4 |
| Cadmium | 3.4 µg/L 68% of the EPA limit 5 µg/L Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2019 | 1/1 | SYR4 |
| Monochloroacetic Acid | 2.85 µg/L No EPA limit set Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2019 | 1/1 | SYR4 |
| Combined Radium (-226 And -228) | 2.532 pCi/L 51% of the EPA limit 5 pCi/L Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2019 | 1/1 | SYR4 |
| Monobromoacetic Acid | 1.775 µg/L No EPA limit set Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2019 | 1/1 | SYR4 |
| Combined Uranium | 1.3 µg/L 4.3% of the EPA limit 30 µg/L Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2019 | 1/1 | SYR4 |
| Dichloromethane | 1.27 µg/L 25% of the EPA limit 5 µg/L Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2019 | 1/1 | SYR4 |
| Tetrachloroethylene | 0.9675 µg/L 19% of the EPA limit 5 µg/L Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2019 | 1/1 | SYR4 |
| Ethylbenzene | 0.6920 µg/L 0.1% of the EPA limit 700 µg/L Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2019 | 1/1 | SYR4 |
| 2,4-D | 0.1000 µg/L 0.1% of the EPA limit 70 µg/L Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2019 | 1/1 | SYR4 |
| Pfba | 0.0092 µg/L No EPA limit set Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2025 | 1/1 | UCMR-5 |
| PFBS | 0.0038 µg/L No EPA limit set Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2025 | 1/1 | UCMR-5 |
| Pfpea | 0.0032 µg/L No EPA limit set Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2025 | 1/1 | UCMR-5 |
| Lead | 0.0016 mg/L 11% of the EPA limit 0.0150 mg/L Main supplier: SAN ANTONIO WATER SYSTEM · 2,643,729 people · 2024 | 1/1 | 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 78023
| Supplier | State | Population served |
|---|---|---|
| SAN ANTONIO WATER SYSTEM | TX | 2,643,729 |
Frequently asked questions about ZIP 78023 tap water
Is the tap water in ZIP 78023 safe to drink?
EPA testing detected 35 contaminants across the water suppliers serving ZIP 78023. 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 78023?
1 public water supplier report EPA drinking-water monitoring for ZIP 78023. Each is listed above with its population served.
What contaminants are in ZIP 78023'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.