Water quality for ZIP code 63304
ZIP 63304 covers Weldon Spring, Cottleville, St. Peters, O'Fallon, and Weldon Spring Heights in St. Charles County, Missouri, one of 14 ZIP codes in the county. 55 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 St. Charles County
18 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Weldon Spring Heights Village PWS Weldon Spr Hght |
100 | 0 | 2.2 mi | |
| ST Peters PWS St. Peters |
52,575 | 0 | 6.4 mi | |
| Ofallon PWS O Fallon |
32,515 | 1 | 8.3 mi | |
| ST Charles PWS St. Charles |
78,961 | 1 | 10.2 mi | |
| ST Paul PWS |
1,700 | 1 | 10.7 mi | |
| MO American ST Louis ST Charles Counties |
1,111,000 | 0 | 13.0 mi | |
| ST Charles CO Pwsd 2 Augusta |
881 | 0 | 13.1 mi | |
| Wentzville PWS Wentzville |
41,784 | 1 | 13.1 mi | |
| Prairie View Acres Subd |
135 | 2 | 14.3 mi | |
| Ecm Water & Sewer Authority Flint Hill Flint Hill |
469 | 0 | 15.6 mi | |
| Country Estates |
50 | 2 | 17.8 mi | |
| ST Charles Pwsd 2 Foristell Foristell |
550 | 1 | 18.0 mi | |
| Big Country Acres Subdivision |
90 | 3 | 18.2 mi | |
| MO American Jaxson Foristell |
535 | 0 | 18.3 mi | |
| Portage Des Sioux PWS Portagedessioux |
345 | 1 | 23.3 mi | |
| ST Charles CO Pwsd 2 Sumac Ridge |
103 | 1 | — | |
| Tara Oaks Manor Assn |
100 | 1 | — | |
| Confluence Rivers Stone Ridge Meadows |
60 | 1 | — |
Non-community systems in St. Charles County (36: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to St. Charles 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 or, for systems without one, to the centre of the first town EPA lists the system as serving, from Census Bureau place files.
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 Missouri 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.