Water quality for ZIP code 78664
ZIP 78664 covers Round Rock and Pflugerville in Williamson County, Texas, one of 19 ZIP codes in the county. 52 active public water systems serve the county; 34 had an EPA violation in the past three years.
Most likely your provider
Your location is within the outer bounds of this system's EPA service area.
Other community water systems in Williamson County
39 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Round Rock Ranch Pud Utility |
285 | 1 | 0.8 mi | |
| Blessing Mobile Home Park |
1,518 | 5 | 2.9 mi | |
| Williamson County Wsid 3 |
8,265 | 1 | 3.6 mi | |
| Paloma Lake MUD 1 |
3,111 | 1 | 4.0 mi | |
| Paloma Lake MUD 2 |
2,265 | 1 | 4.5 mi | |
| Williamson County MUD 10 |
3,513 | 1 | 4.7 mi | |
| Williamson County MUD 11 |
4,248 | 1 | 5.0 mi | |
| Fern Bluff MUD |
5,682 | 0 | 5.1 mi | |
| Brushy Creek Regional Utility Authority |
0 | 0 | 5.1 mi | |
| Brushy Creek MUD |
18,314 | 0 | 5.2 mi | |
| Tal Tex |
939 | 0 | 5.5 mi | |
| Walsh Ranch MUD |
714 | 0 | 5.5 mi | |
| Brushy Bend Park |
645 | 0 | 6.3 mi | |
| City of Hutto |
29,580 | 0 | 6.4 mi | |
| Vista Oaks MUD |
2,724 | 0 | 7.1 mi | |
| City of Cedar Park |
86,939 | 0 | 10.4 mi | |
| Block House MUD |
6,618 | 0 | 11.1 mi | |
| Williamson Travis County MUD 1 |
5,793 | 1 | 11.4 mi | |
| Jonah Water SUD |
29,861 | 1 | 12.1 mi | |
| South San Gabriel Ranches |
510 | 0 | 13.5 mi | |
| City of Taylor |
20,622 | 0 | 14.3 mi | |
| High Gabriel WSC |
492 | 3 | 14.7 mi | |
| Sunny Creek MHC |
510 | 0 | 15.0 mi | |
| City of Leander |
98,330 | 4 | 15.1 mi | |
| City of Granger |
1,914 | 5 | 19.0 mi |
Non-community systems in Williamson County (12: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Mesa Rosa Restaurant |
250 | 2 | 1 | |
|
Round Rock Roller Rink |
100 | 1 | 1 | |
|
Community Christian Church |
180 | 1 | 0 | |
|
Live Oak Water Delivery |
25 | 2 | 0 | |
|
Inner Space Cavern |
310 | 0 | 0 | |
|
San Gabriel River RV Camp Resort |
300 | 1 | 0 | |
|
Juniper RV Park |
21 | 2 | 0 | |
|
200 County Road 314 |
37 | 7 | 1 | |
|
Txdps Tactical Training Center |
124 | 2 | 0 | |
|
Smilin V Ranch |
256 | 1 | 0 | |
|
Premier Athletic Complex |
25 | 2 | 0 | |
|
Simple Water Solutions |
25 | 1 | 0 |
About this data
Water systems are matched to Williamson County, the county this ZIP code lies in, nearest to the ZIP code's centre first. Your exact provider depends on your address and connection; the largest community water system in a county is usually the city or town utility. Distances are measured to the centre of the service area EPA publishes for the system.
ZIP code areas and town boundaries come from the U.S. Census Bureau's 2020 ZCTA files.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Texas records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.