Water quality for ZIP code 78123
ZIP 78123 covers McQueeney and Seguin in Guadalupe County, Texas, one of 7 ZIP codes in the county. 18 active public water systems serve the county; 13 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 Guadalupe County
15 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Garden Oaks |
309 | 0 | 5.0 mi | |
| City of Seguin |
32,736 | 1 | 5.4 mi | |
| City of Marion |
1,971 | 2 | 5.8 mi | |
| Springs Hill SUD |
35,541 | 4 | 8.2 mi | |
| Memory Lane MHP |
30 | 7 | 10.2 mi | |
| City of Cibolo |
20,331 | 1 | 11.1 mi | |
| Shady Meadows Mobile Home Park |
64 | 8 | 12.3 mi | |
| City of Schertz |
41,948 | 2 | 12.8 mi | |
| Crystal Clear SUD |
20,766 | 2 | 12.9 mi | |
| Pecan Grove Mobile Home Park |
467 | 1 | 13.1 mi | |
| Oak Hills Ranch Water |
624 | 5 | 15.4 mi | |
| Lago Vista Water System |
54 | 5 | 23.5 mi | |
| Schertz Seguin Local Government |
0 | 1 | 27.1 mi | |
| Crwa Wells Ranch |
0 | 0 | 28.7 mi | |
| Crwa Lake Dunlap Wtp |
14 | 0 | — |
Non-community systems in Guadalupe County (2: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
John B Sanfilippo & Son |
160 | 0 | 0 | |
|
Atlas Base Camp Equipment & Logistics |
25 | 0 | 0 |
About this data
Water systems are matched to Guadalupe 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.