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Tap water quality report

City of Round Rock

EPA monitoring tested this supplier for 108 contaminants and detected 27. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

108
contaminants tested
27
detected
130,662
people served
12
health-based violations
Texas rankingsLead in TexasPFAS in Texas
Water source
Surface water
Ownership
Local government
Counties served
Williamson

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

12
health-based violations
14
violations on file
0
still open
ViolationTypeStatusPeriod
TT Health-based Resolved 2004-12-01 → 2004-12-31
MCL Health-based Resolved 2003-01-01 → 2003-03-31
MCL Health-based Resolved 2003-01-01 → 2003-03-31
MCL Health-based Resolved 2003-01-01 → 2003-03-31
MCL Health-based Resolved 2003-01-01 → 2003-03-31
MCL Health-based Resolved 2003-01-01 → 2003-03-31
MCL Health-based Resolved 2003-01-01 → 2003-03-31
MCL Health-based Resolved 2002-10-01 → 2002-12-31
MCL Health-based Resolved 2002-10-01 → 2002-12-31
MCL Health-based Resolved 2002-10-01 → 2002-12-31

PFAS detected

PFAS are industrial “forever chemicals”. These are the EPA's latest nationwide test results (2023–2025).
ContaminantMaxDetection ratePeriod
PFBS 0.0067 µg/L 2/10 2025
Pfpea 0.0067 µg/L 2/10 2025
Pfba 0.0051 µg/L 1/10 2025
Pfhxa 0.0037 µg/L 1/10 2025

Other contaminants detected

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 this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Copper
400 µg/L 31%
of the EPA limit 1300 µg/L
worst single sample: 1700 µg/L
310/313 SYR4 2012–2018
Dibromochloromethane
23.4 µg/L
No EPA limit set
worst single sample: 31.3 µg/L
264/264 SYR4 2012–2019
Bromodichloromethane
24.01 µg/L
No EPA limit set
worst single sample: 30.9 µg/L
260/264 SYR4 2012–2019
Chloroform
19.89 µg/L
No EPA limit set
worst single sample: 34.6 µg/L
259/264 SYR4 2012–2019
TTHM
64.14 µg/L 80%
of the EPA limit 80 µg/L
worst single sample: 77.1 µg/L
250/251 SYR4 2012–2019
Total Haloacetic Acids (HAA5)
25.64 µg/L 43%
of the EPA limit 60 µg/L
worst single sample: 34.5 µg/L
250/250 SYR4 2012–2019
Dibromoacetic Acid
9.42 µg/L
No EPA limit set
worst single sample: 13.7 µg/L
249/250 SYR4 2012–2019
Dichloroacetic Acid
13 µg/L
No EPA limit set
worst single sample: 17.2 µg/L
247/250 SYR4 2012–2019
Bromoform
17.545 µg/L
No EPA limit set
worst single sample: 23.4 µg/L
238/264 SYR4 2012–2019
Trichloroacetic Acid
8.345 µg/L
No EPA limit set
worst single sample: 15.5 µg/L
192/250 SYR4 2012–2019
Lead
7.91 µg/L 53%
of the EPA limit 15 µg/L
worst single sample: 42 µg/L
175/313 SYR4 2012–2018
Nitrate
5790 µg/L 58%
of the EPA limit 10000 µg/L
worst single sample: 5900 µg/L
50/50 SYR4 2012–2019
Monobromoacetic Acid
2 µg/L
No EPA limit set
worst single sample: 3.6 µg/L
42/250 SYR4 2012–2019
Monochloroacetic Acid
5.32 µg/L
No EPA limit set
worst single sample: 5.6 µg/L
15/250 SYR4 2012–2019
Lead
0.0050 mg/L 34%
of the EPA limit 0.0150 mg/L
 14/14 LCR 2023
Fluoride
315 µg/L 7.9%
of the EPA limit 4000 µg/L
worst single sample: 330 µg/L
11/11 SYR4 2012–2019
Barium
53.5 µg/L 2.7%
of the EPA limit 2000 µg/L
worst single sample: 53.7 µg/L
9/9 SYR4 2013–2019
Nitrate-Nitrite
5730 µg/L 57%
of the EPA limit 10000 µg/L
worst single sample: 5790 µg/L
7/7 SYR4 2012–2015
Cyanide
115 µg/L 57%
of the EPA limit 200 µg/L
worst single sample: 120 µg/L
6/8 SYR4 2014–2019
Lithium
13.5 µg/L
No EPA limit set
 6/10 UCMR-5 2025
Atrazine
0.1795 µg/L 6%
of the EPA limit 3 µg/L
worst single sample: 0.1800 µg/L
2/11 SYR4 2012–2019
Arsenic
1.68 µg/L 17%
of the EPA limit 10 µg/L
 1/9 SYR4 2013–2019
Selenium
4.38 µg/L 8.8%
of the EPA limit 50 µg/L
 1/9 SYR4 2013–2019
81 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAsbestosBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumCombined UraniumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebEthylene DibromideEndrinEthylbenzeneGross Alpha, Excl. Radon And UGross Beta Particle ActivityHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfdaPfdoaPfeesaPfhpaPfhpsPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpesPftaPftrdaPfunaPentachlorophenolPicloramSimazineStyreneTetrachloroethyleneThallium, TotalTolueneToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
MORGAN, CRAIG
Phone
512-218-5410

Frequently asked questions about City of Round Rock

Is City of Round Rock tap water safe to drink?

EPA monitoring detected 27 contaminants in City of Round Rock's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in City of Round Rock's water?

EPA monitoring detected Copper, Dibromochloromethane, Bromodichloromethane, Chloroform, TTHM, and others. The full list with the level and data source for each is above.

How many people does City of Round Rock serve?

City of Round Rock reports serving 130,662 people in Texas, per its EPA record.

Has City of Round Rock had any water quality violations?

The EPA has 14 violations on file for City of Round Rock, of which 12 are health-based (a contaminant limit or required treatment was breached) and 0 remain open. The rest are monitoring or reporting failures.

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.