Water quality in San Luis, Colorado
San Luis is in Costilla County. 12 active public water systems serve the county; 10 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 Costilla County
7 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| Costilla County WS |
561 | 0 | 2.6 mi | |
| Viejo San Acacio |
45 | 1 | 7.3 mi | |
| San Acacio Domestic WA |
40 | 4 | 7.8 mi | |
| Garcia Domestic Wua |
100 | 4 | 15.0 mi | |
| FT Garland Wsd |
477 | 6 | 15.6 mi | |
| Blanca Town of |
469 | 2 | 17.2 mi | |
| Lake Sanchez Estates |
34 | 5 | — |
Non-community systems in Costilla County (4: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Blanca FT Garland MD |
108 | 2 | 0 | |
|
Sierra Grande School District |
304 | 7 | 0 | |
|
Blanca Forestry Products Fort Garland |
50 | 6 | 0 | |
|
Trinchera Property Management INC |
55 | 4 | 0 |
About this data
Water systems are matched to Costilla County, nearest to San Luis 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.
Town locations and ZIP code areas come from U.S. Census Bureau 2020 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 Colorado 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.