Water quality for ZIP code 78640
ZIP 78640 covers Kyle, Niederwald, Uhland, Creedmoor, Mustang Ridge, and San Marcos in Hays County, Texas, one of 7 ZIP codes in the county. 121 active public water systems serve the county; 77 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 Hays County
51 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| City of Kyle |
52,000 | 0 | 2.5 mi | |
| County Line SUD |
19,609 | 3 | 4.0 mi | |
| Goforth SUD |
34,893 | 3 | 4.0 mi | |
| South Buda Wcid 1 |
2,517 | 1 | 4.1 mi | |
| Meadow Woods Water Supply |
1,554 | 0 | 4.6 mi | |
| Granite Creek WSC |
219 | 5 | 4.6 mi | |
| City of Mountain City |
725 | 1 | 4.7 mi | |
| City of Buda |
13,830 | 2 | 6.5 mi | |
| The Woodlands Water System |
195 | 3 | 7.1 mi | |
| Ruby Ranch WSC |
738 | 2 | 7.4 mi | |
| Huntington Estates |
378 | 0 | 8.0 mi | |
| Cimarron Park Water |
2,079 | 1 | 8.1 mi | |
| Leisurewoods Water |
1,338 | 0 | 8.1 mi | |
| Oak Forest WSC |
339 | 1 | 8.4 mi | |
| City of Hays |
270 | 1 | 8.9 mi | |
| Elliott Ranch Water System |
639 | 1 | 9.1 mi | |
| Oak Meadows |
954 | 1 | 9.2 mi | |
| Chaparral Water System Hays |
444 | 0 | 10.2 mi | |
| Texas State University San Marcos |
43,552 | 1 | 10.3 mi | |
| Copper Hills Water System |
141 | 1 | 10.4 mi | |
| Southwest Territory |
315 | 0 | 10.6 mi | |
| Sierra West Subdivision |
495 | 0 | 11.0 mi | |
| City of San Marcos |
72,970 | 1 | 11.7 mi | |
| Mid-Tex Utilities |
1,569 | 1 | 12.2 mi | |
| Reunion Ranch Wcid |
1,326 | 1 | 12.5 mi |
Non-community systems in Hays County (69: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to Hays 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.