Round Rock
TX

Is Round Rock, TX Tap Water Safe to Drink?

Round Rock tap water meets federal Safe Drinking Water Act standards but 6 of 6 ZIP codes show detections above EPA health guidelines, primarily for lithium. A certified filter is recommended for households that want an additional layer of protection.

14Water systems
6ZIP codes
100%ZIPs above EPA guideline
Metro areaAustin-Round Rock-San Marcos, TX
Latest data2025-10-08

Where Does Round Rock Get Its Water?

Water in Round Rock, TX is provided by 14 public water systems: CITY OF ROUND ROCK, CITY OF AUSTIN WATER & WASTEWATER, CITY OF GEORGETOWN, JONAH WATER SUD, BRUSHY CREEK MUD, FERN BLUFF MUD, MANVILLE WSC, TRAVIS COUNTY MUD 18, TRAVIS COUNTY WCID 10, TRAVIS COUNTY WCID 18, WILLIAMSON COUNTY MUD 10, WILLIAMSON COUNTY MUD 11, WILLIAMSON COUNTY WSID 3 and WINDERMERE COMMUNITY.

How Is Round Rock Tap Water Treated?

Treated water is disinfected using free chlorine and calcium hypochlorite and chloramines and on-site generated disinfectant. Treatment includes conventional treatment (coagulation, flocculation, and filtration), direct filtration, groundwater disinfection, in-line filtration, membrane filtration, post-ozone biofiltration and slow sand filtration.

What's in Round Rock Tap Water?

The following contaminants were detected most frequently in Round Rock public water systems. 6 of 6 ZIP codes showed detections above EPA health guidelines.

ContaminantPeak detectedEPA guidelineZIPs detectedStatus
lithium 58.8 µg/L 10 µg/L 6 ZIPs Above guideline
PFTrDA 0.007 µg/L — 0 ZIPs Within guideline
PFBA 0.005 µg/L — 0 ZIPs Within guideline
HFPO-DA 0.005 µg/L — 0 ZIPs Within guideline
6:2 FTS 0.005 µg/L — 0 ZIPs Within guideline

Health Risk Profile for Round Rock

Based on EPA monitoring data, 6 of 6 ZIP codes in Round Rock have recorded detections above EPA health guidelines. Sensitive populations such as infants, pregnant individuals, and those with weakened immune systems may benefit from an additional layer of protection such as a certified point-of-use filter.

Best Broad-Spectrum Filters for This Water Profile

This city profile includes PFAS detections, chlorine disinfection, and other dissolved contaminants. Reverse osmosis (RO) systems certified under NSF/ANSI 58 provide broad reduction coverage; for PFAS specifically, confirm NSF/ANSI P473 or equivalent PFAS reduction certification.

Waterdrop G3P600 Reverse Osmosis System
Under-sink RO system

8-stage tankless RO system certified to NSF/ANSI 58, reduces 1,000+ contaminants including PFAS, lead, arsenic, fluoride, and nitrates.

See recommendations matched to your exact address: choose your ZIP code below.

Frequently Asked Questions about Round Rock Tap Water

Is Round Rock tap water safe to drink?

Round Rock tap water meets Safe Drinking Water Act requirements but 6 of 6 ZIP codes show contaminant levels above EPA health-based guidelines. A certified point-of-use filter adds an extra layer of protection.

What contaminants are in Round Rock tap water?

The most commonly detected contaminants in Round Rock water systems include: lithium, PFTrDA, PFBA. See the ZIP-level reports for exact measurements and EPA guideline comparisons.

Where does Round Rock get its drinking water?

Round Rock receives water from 14 public water systems, including CITY OF ROUND ROCK.

Do I need a water filter in Round Rock?

If your ZIP code is among those with detections above EPA health guidelines, choose a filter certified for the specific contaminants shown in your ZIP report. Reverse osmosis is generally the broadest option for PFAS, lithium, and many other dissolved contaminants.

How often is Round Rock tap water tested?

Public water systems in Round Rock are required by the EPA to test for regulated contaminants on schedules ranging from daily (for microbials and disinfectants) to annual or triennial (for many chemical contaminants). Results are published in annual Consumer Confidence Reports (CCRs). The data on this page reflects the most recent available EPA monitoring results, with the latest sample date of 2025-10-08.

Tap water reports by ZIP in Round Rock

Water utilities serving Round Rock, TX

Service area boundaries are approximate and based on state filings or modeled estimates. Contact your utility to confirm exact service at a specific address.

Modeled boundaries are shown with a dashed outline.

Also covers / overlaps with