What was found in Round Rock's water
The highest level seen across the city's suppliers, 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 | 3/6 | SYR4 |
| Nitrate-Nitrite | 5790 µg/L 58% of the EPA limit 10000 µg/L | 2/6 | SYR4 |
| Copper | 1700 µg/L 131% of the EPA limit, in the worst sample — 1300 µg/L | 5/6 | SYR4 |
| Fluoride | 690 µg/L 17% of the EPA limit 4000 µg/L | 3/6 | SYR4 |
| Cyanide | 120 µg/L 60% of the EPA limit 200 µg/L | 3/6 | SYR4 |
| TTHM | 83.3 µg/L 104% of the EPA limit, in the worst sample — 80 µg/L | 6/6 | SYR4 |
| Barium | 56.1 µg/L 2.8% of the EPA limit 2000 µg/L | 3/6 | SYR4 |
| Lead | 42 µg/L 280% of the EPA limit, in the worst sample — 15 µg/L | 4/6 | SYR4 |
| Total Haloacetic Acids (HAA5) | 40.7 µg/L 68% of the EPA limit 60 µg/L | 6/6 | SYR4 |
| Chloroform | 37.9 µg/L No EPA limit set | 6/6 | SYR4 |
| Bromodichloromethane | 35.6 µg/L No EPA limit set | 6/6 | SYR4 |
| Dibromochloromethane | 31.3 µg/L No EPA limit set | 6/6 | SYR4 |
| Dichloroacetic Acid | 24.9 µg/L No EPA limit set | 6/6 | SYR4 |
| Bromoform | 23.4 µg/L No EPA limit set | 6/6 | SYR4 |
| Lithium | 16.3 µg/L No EPA limit set | 3/6 | UCMR-5 |
| Trichloroacetic Acid | 15.5 µg/L No EPA limit set | 6/6 | SYR4 |
| Dibromoacetic Acid | 13.7 µg/L No EPA limit set | 6/6 | SYR4 |
| Monochloroacetic Acid | 5.6 µg/L No EPA limit set | 5/6 | SYR4 |
| Selenium | 4.38 µg/L 8.8% of the EPA limit 50 µg/L | 2/6 | SYR4 |
| Gross Beta Particle Activity | 4 pCi/L No EPA limit set | 1/6 | SYR4 |
| Monobromoacetic Acid | 3.6 µg/L No EPA limit set | 5/6 | SYR4 |
| Chromium | 2.09 µg/L 2.1% of the EPA limit 100 µg/L | 1/6 | SYR4 |
| Arsenic | 1.68 µg/L 17% of the EPA limit 10 µg/L | 3/6 | SYR4 |
| Combined Radium (-226 And -228) | 1.5 pCi/L 30% of the EPA limit 5 pCi/L | 1/6 | SYR4 |
| Atrazine | 0.1800 µg/L 6% of the EPA limit 3 µg/L | 2/6 | SYR4 |
| PFBS | 0.0067 µg/L No EPA limit set | 2/6 | UCMR-5 |
| Pfpea | 0.0067 µg/L No EPA limit set | 3/6 | UCMR-5 |
| Pfba | 0.0061 µg/L No EPA limit set | 2/6 | UCMR-5 |
| Lead | 0.0050 mg/L 34% of the EPA limit 0.0150 mg/L | 5/6 | LCR |
| Pfhxa | 0.0038 µg/L No EPA limit set | 2/6 | UCMR-5 |
| PFHXS | 0.0037 µg/L No EPA limit set | 1/6 | UCMR-5 |
Water suppliers serving Round Rock
| Supplier | Population served |
|---|---|
| CITY OF ROUND ROCK | 130,662 |
| BRUSHY CREEK MUD | 18,314 |
| FERN BLUFF MUD | 5,682 |
| BLESSING MOBILE HOME PARK | 1,518 |
| WALSH RANCH MUD | 714 |
| BRUSHY CREEK REGIONAL UTILITY AUTHORITY | 0 |
Frequently asked questions about Round Rock tap water
Is Round Rock tap water safe to drink?
EPA testing detected 31 contaminants in the water serving Round Rock. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Round Rock?
6 public water suppliers report drinking-water monitoring for Round Rock, Texas to the EPA. Each is listed above with its population served.
What contaminants are in Round Rock's water?
The contaminants EPA monitoring detected in Round Rock include Nitrate, Nitrate-Nitrite, Copper, Fluoride, Cyanide. The full list, with the highest level found and the data source, is in the table above.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.