What was found in ZIP 78620
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 |
|---|---|---|---|
| Fluoride | 246.5 µg/L 6.2% of the EPA limit 4000 µg/L Main supplier: WEST TRAVIS COUNTY PUBLIC UTILITY AGENCY · 35,664 people · 2019
Highest in the ZIP: 1848 µg/L — DRIPPING SPRINGS WSC · 8,037 people · 2017 | 2/2 | SYR4 |
| Copper | 1400 µg/L 108% of the EPA limit, at the 95th percentile of samples — 1300 µg/L Main supplier: WEST TRAVIS COUNTY PUBLIC UTILITY AGENCY · 35,664 people · 2019 | 2/2 | SYR4 |
| Nitrate-Nitrite | 810 µg/L 8.1% of the EPA limit 10000 µg/L Highest in the ZIP: DRIPPING SPRINGS WSC · 8,037 people · 2015 | 1/2 | SYR4 |
| Nitrate | 610 µg/L 6.1% of the EPA limit 10000 µg/L Main supplier: WEST TRAVIS COUNTY PUBLIC UTILITY AGENCY · 35,664 people · 2019
Highest in the ZIP: 770 µg/L — DRIPPING SPRINGS WSC · 8,037 people · 2019 | 2/2 | SYR4 |
| Cyanide | 113 µg/L 56% of the EPA limit 200 µg/L Main supplier: WEST TRAVIS COUNTY PUBLIC UTILITY AGENCY · 35,664 people · 2019 | 2/2 | SYR4 |
| Nitrite | 92 µg/L 9.2% of the EPA limit 1000 µg/L Highest in the ZIP: DRIPPING SPRINGS WSC · 8,037 people · 2015 | 1/2 | SYR4 |
| TTHM | 63.765 µg/L 80% of the EPA limit 80 µg/L Main supplier: WEST TRAVIS COUNTY PUBLIC UTILITY AGENCY · 35,664 people · 2019
Highest in the ZIP: 69.67 µg/L — DRIPPING SPRINGS WSC · 8,037 people · 2019 | 2/2 | SYR4 |
| Barium | 65.74 µg/L 3.3% of the EPA limit 2000 µg/L Main supplier: WEST TRAVIS COUNTY PUBLIC UTILITY AGENCY · 35,664 people · 2019 | 2/2 | SYR4 |
| Lithium | 51.4 µg/L No EPA limit set Highest in the ZIP: DRIPPING SPRINGS WSC · 8,037 people · 2023 | 1/2 | UCMR-5 |
| Total Haloacetic Acids (HAA5) | 33.035 µg/L 55% of the EPA limit 60 µg/L Main supplier: WEST TRAVIS COUNTY PUBLIC UTILITY AGENCY · 35,664 people · 2019 | 2/2 | SYR4 |
| Chloroform | 26.185 µg/L No EPA limit set Main supplier: WEST TRAVIS COUNTY PUBLIC UTILITY AGENCY · 35,664 people · 2019
Highest in the ZIP: 27.46 µg/L — DRIPPING SPRINGS WSC · 8,037 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 23.245 µg/L No EPA limit set Main supplier: WEST TRAVIS COUNTY PUBLIC UTILITY AGENCY · 35,664 people · 2019
Highest in the ZIP: 27.045 µg/L — DRIPPING SPRINGS WSC · 8,037 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 18.97 µg/L No EPA limit set Main supplier: WEST TRAVIS COUNTY PUBLIC UTILITY AGENCY · 35,664 people · 2019
Highest in the ZIP: 20.28 µg/L — DRIPPING SPRINGS WSC · 8,037 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 16.785 µg/L No EPA limit set Main supplier: WEST TRAVIS COUNTY PUBLIC UTILITY AGENCY · 35,664 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 11.185 µg/L No EPA limit set Main supplier: WEST TRAVIS COUNTY PUBLIC UTILITY AGENCY · 35,664 people · 2019 | 2/2 | SYR4 |
| Gross Beta Particle Activity | 4.6 pCi/L No EPA limit set Main supplier: WEST TRAVIS COUNTY PUBLIC UTILITY AGENCY · 35,664 people · 2017
Highest in the ZIP: 10.355 pCi/L — DRIPPING SPRINGS WSC · 8,037 people · 2018 | 2/2 | SYR4 |
| Gross Alpha, Excl. Radon And U | 7.8 pCi/L 52% of the EPA limit 15 pCi/L Highest in the ZIP: DRIPPING SPRINGS WSC · 8,037 people · 2018 | 1/2 | SYR4 |
| Lead | 5.4 µg/L 36% of the EPA limit 15 µg/L Main supplier: WEST TRAVIS COUNTY PUBLIC UTILITY AGENCY · 35,664 people · 2019
Highest in the ZIP: 7.8 µg/L — DRIPPING SPRINGS WSC · 8,037 people · 2017 | 2/2 | SYR4 |
| Dibromoacetic Acid | 6.89 µg/L No EPA limit set Main supplier: WEST TRAVIS COUNTY PUBLIC UTILITY AGENCY · 35,664 people · 2019 | 2/2 | SYR4 |
| Monochloroacetic Acid | 6.01 µg/L No EPA limit set Main supplier: WEST TRAVIS COUNTY PUBLIC UTILITY AGENCY · 35,664 people · 2019 | 2/2 | SYR4 |
| Bromoform | 4.56 µg/L No EPA limit set Main supplier: WEST TRAVIS COUNTY PUBLIC UTILITY AGENCY · 35,664 people · 2019
Highest in the ZIP: 5.2115 µg/L — DRIPPING SPRINGS WSC · 8,037 people · 2019 | 2/2 | SYR4 |
| Selenium | 3.52 µg/L 7% of the EPA limit 50 µg/L Main supplier: WEST TRAVIS COUNTY PUBLIC UTILITY AGENCY · 35,664 people · 2019 | 1/2 | SYR4 |
| Monobromoacetic Acid | 1.27 µg/L No EPA limit set Main supplier: WEST TRAVIS COUNTY PUBLIC UTILITY AGENCY · 35,664 people · 2019
Highest in the ZIP: 2.66 µg/L — DRIPPING SPRINGS WSC · 8,037 people · 2019 | 2/2 | SYR4 |
| Combined Radium (-226 And -228) | 2.241 pCi/L 45% of the EPA limit 5 pCi/L Highest in the ZIP: DRIPPING SPRINGS WSC · 8,037 people · 2018 | 1/2 | SYR4 |
| Arsenic | 1.51 µg/L 15% of the EPA limit 10 µg/L Main supplier: WEST TRAVIS COUNTY PUBLIC UTILITY AGENCY · 35,664 people · 2019 | 1/2 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 1.0735 µg/L 18% of the EPA limit 6 µg/L Main supplier: WEST TRAVIS COUNTY PUBLIC UTILITY AGENCY · 35,664 people · 2019 | 1/2 | SYR4 |
| Chromium | 1.01 µg/L 1% of the EPA limit 100 µg/L Main supplier: WEST TRAVIS COUNTY PUBLIC UTILITY AGENCY · 35,664 people · 2019 | 1/2 | SYR4 |
| Pfba | 0.0065 µg/L No EPA limit set Main supplier: WEST TRAVIS COUNTY PUBLIC UTILITY AGENCY · 35,664 people · 2024 | 1/2 | UCMR-5 |
| Lead | 0.0012 mg/L 8.1% of the EPA limit 0.0150 mg/L Main supplier: WEST TRAVIS COUNTY PUBLIC UTILITY AGENCY · 35,664 people · 2025
Highest in the ZIP: 0.0019 mg/L — DRIPPING SPRINGS WSC · 8,037 people · 2024 | 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 78620
| Supplier | State | Population served |
|---|---|---|
| WEST TRAVIS COUNTY PUBLIC UTILITY AGENCY | TX | 35,664 |
| DRIPPING SPRINGS WSC | TX | 8,037 |
Frequently asked questions about ZIP 78620 tap water
Is the tap water in ZIP 78620 safe to drink?
EPA testing detected 29 contaminants across the water suppliers serving ZIP 78620. 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 78620?
2 public water suppliers report EPA drinking-water monitoring for ZIP 78620. Each is listed above with its population served.
What contaminants are in ZIP 78620's water?
EPA monitoring detected Fluoride, Copper, Nitrate-Nitrite, Nitrate, Cyanide, and others across this ZIP's suppliers. The full list with levels and sources is above.