Water quality in Louisville, Colorado
Louisville is in Boulder County. 80 active public water systems serve the county; 45 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 Boulder County
40 systems, nearest first| System | Serves | Status | Rules violated, 3 yr | Distance |
|---|---|---|---|---|
| East Boulder County WD |
300 | 3 | 1.9 mi | |
| Lafayette City of |
28,700 | 4 | 2.3 mi | |
| Superior MD NO 1 |
17,900 | 0 | 2.5 mi | |
| Maple Grove WD |
35 | 3 | 2.6 mi | |
| Lark Meadows WA |
75 | 0 | 2.8 mi | |
| Baseline WD |
820 | 1 | 2.8 mi | |
| Shannon Wsd |
450 | 0 | 2.9 mi | |
| Hoover Hills Wsd |
662 | 0 | 4.0 mi | |
| Sans Souci Cooperative |
150 | 8 | 4.8 mi | |
| Table Mesa Village MHP |
75 | 1 | 4.9 mi | |
| Mile HI Water INC Hauler |
1,000 | 3 | 5.3 mi | |
| San Lazaro Mfctd Housing Community |
844 | 5 | 6.1 mi | |
| Erie Town of |
47,444 | 0 | 6.6 mi | |
| Boulder City of |
166,080 | 1 | 6.6 mi | |
| Vista Village MHP Boulder |
750 | 1 | 6.9 mi | |
| Eldorado Municipal System |
308 | 0 | 7.4 mi | |
| Boulder Meadows MHP |
1,657 | 0 | 8.3 mi | |
| Spring Valley Mutual WA |
100 | 1 | 9.6 mi | |
| Left Hand WD |
20,280 | 0 | 9.7 mi | |
| Pine Brook Hills WD |
1,100 | 0 | 10.4 mi | |
| Olde Stage WD |
250 | 1 | 12.4 mi | |
| Lefthand Wsd Lake Pines |
250 | 0 | 13.8 mi | |
| Longmont City of |
104,178 | 0 | 13.8 mi | |
| Countryside of Longmont Longmont |
775 | 2 | 13.9 mi | |
| ST Vrain MHP LLC Longmont |
544 | 0 | 13.9 mi |
Non-community systems in Boulder County (39: schools, campgrounds, workplaces, restaurants)
These systems serve places you visit rather than homes.
About this data
Water systems are matched to Boulder County, nearest to Louisville 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.
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.