What was found in ZIP 78664
The highest level seen across the suppliers serving this ZIP, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 5900 µg/L 59% of the EPA limit 10000 µg/L | 4/4 | SYR4 |
| Nitrate-Nitrite | 5790 µg/L 58% of the EPA limit 10000 µg/L | 4/4 | SYR4 |
| Fluoride | 3520 µg/L 88% of the EPA limit 4000 µg/L | 4/4 | SYR4 |
| Copper | 2300 µg/L 177% of the EPA limit, in the worst sample — 1300 µg/L | 4/4 | SYR4 |
| Nitrite | 200 µg/L 20% of the EPA limit 1000 µg/L | 1/4 | SYR4 |
| Xylenes, Total | 161 µg/L 1.6% of the EPA limit 10000 µg/L | 3/4 | SYR4 |
| Barium | 148 µg/L 7.4% of the EPA limit 2000 µg/L | 4/4 | SYR4 |
| Lead | 132 µg/L 880% of the EPA limit, in the worst sample — 15 µg/L | 4/4 | SYR4 |
| Cyanide | 130 µg/L 65% of the EPA limit 200 µg/L | 4/4 | SYR4 |
| TTHM | 113 µg/L 141% of the EPA limit, in the worst sample — 80 µg/L | 4/4 | SYR4 |
| Lithium | 83.8 µg/L No EPA limit set | 4/4 | UCMR-5 |
| Chloroform | 60 µg/L No EPA limit set | 4/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 56.8 µg/L 95% of the EPA limit 60 µg/L | 4/4 | SYR4 |
| Dibromochloromethane | 43.3 µg/L No EPA limit set | 4/4 | SYR4 |
| Bromodichloromethane | 38.6 µg/L No EPA limit set | 4/4 | SYR4 |
| Trichloroacetic Acid | 30.1 µg/L No EPA limit set | 4/4 | SYR4 |
| Ethylbenzene | 30 µg/L 4.3% of the EPA limit 700 µg/L | 2/4 | SYR4 |
| Bromoform | 28.4 µg/L No EPA limit set | 4/4 | SYR4 |
| Dichloroacetic Acid | 25.1 µg/L No EPA limit set | 4/4 | SYR4 |
| Di(2-ethylhexyl) Phthalate | 25 µg/L 417% of the EPA limit, in the worst sample — 6 µg/L | 1/4 | SYR4 |
| Gross Alpha, Excl. Radon And U | 14.3 pCi/L 95% of the EPA limit 15 pCi/L | 3/4 | SYR4 |
| Dibromoacetic Acid | 13.7 µg/L No EPA limit set | 4/4 | SYR4 |
| Gross Beta Particle Activity | 7.6 pCi/L No EPA limit set | 3/4 | SYR4 |
| Selenium | 7.1 µg/L 14% of the EPA limit 50 µg/L | 2/4 | SYR4 |
| Monochloroacetic Acid | 6.3 µg/L No EPA limit set | 4/4 | SYR4 |
| Chromium | 4.16 µg/L 4.2% of the EPA limit 100 µg/L | 2/4 | SYR4 |
| Combined Radium (-226 And -228) | 3.64 pCi/L 73% of the EPA limit 5 pCi/L | 3/4 | SYR4 |
| Monobromoacetic Acid | 3.6 µg/L No EPA limit set | 4/4 | SYR4 |
| Arsenic | 3.4 µg/L 34% of the EPA limit 10 µg/L | 4/4 | SYR4 |
| Vinyl Chloride | 3.2 µg/L 160% of the EPA limit, in the worst sample — 2 µg/L | 1/4 | SYR4 |
| Combined Uranium | 2.3 µg/L 7.7% of the EPA limit 30 µg/L | 3/4 | SYR4 |
| Diquat | 1.9 µg/L 9.5% of the EPA limit 20 µg/L | 1/4 | SYR4 |
| Thallium, Total | 1.21 µg/L 61% of the EPA limit 2 µg/L | 1/4 | SYR4 |
| Dalapon | 1 µg/L 0.5% of the EPA limit 200 µg/L | 1/4 | SYR4 |
| Atrazine | 0.6600 µg/L 22% of the EPA limit 3 µg/L | 2/4 | SYR4 |
| Simazine | 0.1500 µg/L 3.8% of the EPA limit 4 µg/L | 1/4 | SYR4 |
| PFNA | 0.0243 µg/L No EPA limit set | 1/4 | UCMR-5 |
| Pfpea | 0.0212 µg/L No EPA limit set | 4/4 | UCMR-5 |
| Pfba | 0.0158 µg/L No EPA limit set | 4/4 | UCMR-5 |
| PFOS | 0.0124 µg/L No EPA limit set | 3/4 | UCMR-5 |
| PFBS | 0.0100 µg/L No EPA limit set | 4/4 | UCMR-5 |
| Pfhxa | 0.0092 µg/L No EPA limit set | 4/4 | UCMR-5 |
| PFHXS | 0.0070 µg/L No EPA limit set | 3/4 | UCMR-5 |
| PFOA | 0.0059 µg/L No EPA limit set | 2/4 | UCMR-5 |
| Lead | 0.0050 mg/L 34% of the EPA limit 0.0150 mg/L | 4/4 | LCR |
| Pfhpa | 0.0043 µg/L No EPA limit set | 1/4 | UCMR-5 |
| Pfuna | 0.0027 µg/L No EPA limit set | 1/4 | UCMR-5 |
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 single worst sample on
record — over 100% is worth reading, but is not by itself a violation.
Formal violations are listed separately.
Water suppliers serving ZIP 78664
| Supplier | State | Population served |
|---|---|---|
| CITY OF ROUND ROCK | TX | 130,662 |
| MANVILLE WSC | TX | 39,648 |
| JONAH WATER SUD | TX | 29,861 |
| WINDERMERE COMMUNITY | TX | 21,231 |
Frequently asked questions about ZIP 78664 tap water
Is the tap water in ZIP 78664 safe to drink?
EPA testing detected 47 contaminants across the water suppliers serving ZIP 78664. 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 78664?
4 public water suppliers report EPA drinking-water monitoring for ZIP 78664. Each is listed above with its population served.
What contaminants are in ZIP 78664's water?
EPA monitoring detected Nitrate, Nitrate-Nitrite, Fluoride, Copper, Nitrite, and others across this ZIP's suppliers. The full list with levels and sources is above.