Water quality for ZIP code 78666
ZIP 78666 covers San Marcos, Kyle, Redwood, Canyon Lake, and Wimberley in Hays County, Texas, one of 7 ZIP codes in the county. 121 active public water systems serve the county; 76 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 |
|---|---|---|---|---|
| Texas State University San Marcos |
43,552 | 1 | 1.4 mi | |
| Blue Agave Mobile Home Park |
57 | 5 | 3.4 mi | |
| The Woodlands Water System |
195 | 3 | 5.1 mi | |
| Oak Meadows |
954 | 1 | 5.7 mi | |
| Granite Creek WSC |
219 | 5 | 7.5 mi | |
| Cielo Azul Ranch |
84 | 2 | 9.6 mi | |
| City of Kyle |
52,000 | 0 | 10.1 mi | |
| Meadow Woods Water Supply |
1,554 | 0 | 10.5 mi | |
| Wimberley WSC |
5,334 | 1 | 11.1 mi | |
| County Line SUD |
19,609 | 3 | 11.2 mi | |
| City of Mountain City |
725 | 1 | 11.8 mi | |
| Cedar Oak Mesa WSC |
497 | 4 | 11.8 mi | |
| Sierra West Subdivision |
495 | 0 | 12.5 mi | |
| Skyline Ranch Estates WSC |
261 | 1 | 12.7 mi | |
| Plum Creek |
7,065 | 0 | 13.3 mi | |
| Woodcreek Utility CO 1 |
2,700 | 1 | 13.3 mi | |
| Ruby Ranch WSC |
738 | 2 | 13.4 mi | |
| Mountain Crest Water |
309 | 1 | 13.9 mi | |
| South Buda Wcid 1 |
2,517 | 1 | 14.4 mi | |
| Woodcreek Utility 2 |
3,096 | 5 | 14.9 mi | |
| LA Ventana Water Supply System |
747 | 4 | 15.3 mi | |
| Goforth SUD |
34,893 | 3 | 15.3 mi | |
| Wimberley Oaks WSC |
69 | 3 | 15.4 mi | |
| Oak Forest WSC |
339 | 1 | 15.9 mi | |
| City of Buda |
13,830 | 2 | 16.0 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.