Water quality for ZIP code 78674
ZIP 78674 covers Weir 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
Other community water systems in Williamson County
39 systems, largest first| System | Serves | Status | Rules violated, 3 yr |
|---|---|---|---|
| City of Round Rock |
130,662 | 0 | |
| City of Leander |
98,330 | 4 | |
| City of Cedar Park |
86,939 | 0 | |
| Jonah Water SUD |
29,861 | 1 | |
| City of Hutto |
29,580 | 0 | |
| City of Taylor |
20,622 | 0 | |
| Brushy Creek MUD |
18,314 | 0 | |
| Sonterra MUD |
16,614 | 3 | |
| Jarrell Schwertner WSC |
9,681 | 0 | |
| City of Liberty Hill |
8,777 | 2 | |
| Williamson County Wsid 3 |
8,265 | 1 | |
| Block House MUD |
6,618 | 0 | |
| Williamson Travis County MUD 1 |
5,793 | 1 | |
| Fern Bluff MUD |
5,682 | 0 | |
| Williamson County MUD 11 |
4,248 | 1 | |
| Williamson County MUD 10 |
3,513 | 1 | |
| City of Jarrell |
3,450 | 2 | |
| Paloma Lake MUD 1 |
3,111 | 1 | |
| City of Bartlett |
2,950 | 7 | |
| Vista Oaks MUD |
2,724 | 0 | |
| Paloma Lake MUD 2 |
2,265 | 1 | |
| City of Granger |
1,914 | 5 | |
| Blessing Mobile Home Park |
1,518 | 5 | |
| Durham Park WSC |
1,251 | 2 | |
| City of Florence |
1,136 | 5 |
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 |
|---|---|---|---|---|
|
Inner Space Cavern |
310 | 0 | 0 | |
|
San Gabriel River RV Camp Resort |
300 | 1 | 0 | |
|
Smilin V Ranch |
256 | 1 | 0 | |
|
Mesa Rosa Restaurant |
250 | 2 | 1 | |
|
Community Christian Church |
180 | 1 | 0 | |
|
Txdps Tactical Training Center |
124 | 2 | 0 | |
|
Round Rock Roller Rink |
100 | 1 | 1 | |
|
200 County Road 314 |
37 | 7 | 1 | |
|
Live Oak Water Delivery |
25 | 2 | 0 | |
|
Premier Athletic Complex |
25 | 2 | 0 | |
|
Simple Water Solutions |
25 | 1 | 0 | |
|
Juniper RV Park |
21 | 2 | 0 |
About this data
Water systems are matched to Williamson County, the county this ZIP code lies in, largest 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.
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.