Water quality for ZIP code 80303
ZIP 80303 covers Boulder, Paragon Estates, Eldorado Springs, and Louisville in Boulder County, Colorado, one of 18 ZIP codes in the 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 |
|---|---|---|---|---|
| Table Mesa Village MHP |
75 | 1 | 1.4 mi | |
| Sans Souci Cooperative |
150 | 8 | 1.7 mi | |
| East Boulder County WD |
300 | 3 | 1.7 mi | |
| Hoover Hills Wsd |
662 | 0 | 2.4 mi | |
| Baseline WD |
820 | 1 | 2.9 mi | |
| Lark Meadows WA |
75 | 0 | 3.6 mi | |
| Louisville City of |
20,975 | 1 | 3.6 mi | |
| Superior MD NO 1 |
17,900 | 0 | 3.8 mi | |
| Boulder City of |
166,080 | 1 | 4.0 mi | |
| Vista Village MHP Boulder |
750 | 1 | 4.2 mi | |
| Eldorado Municipal System |
308 | 0 | 4.4 mi | |
| San Lazaro Mfctd Housing Community |
844 | 5 | 4.5 mi | |
| Shannon Wsd |
450 | 0 | 4.6 mi | |
| Mile HI Water INC Hauler |
1,000 | 3 | 4.6 mi | |
| Maple Grove WD |
35 | 3 | 6.1 mi | |
| Boulder Meadows MHP |
1,657 | 0 | 6.3 mi | |
| Spring Valley Mutual WA |
100 | 1 | 6.7 mi | |
| Pine Brook Hills WD |
1,100 | 0 | 7.4 mi | |
| Erie Town of |
47,444 | 0 | 9.4 mi | |
| Olde Stage WD |
250 | 1 | 10.0 mi | |
| Left Hand WD |
20,280 | 0 | 10.3 mi | |
| Lefthand Wsd Lake Pines |
250 | 0 | 11.9 mi | |
| Jamestown Town of |
280 | 7 | 13.9 mi | |
| Longmont City of |
104,178 | 0 | 14.4 mi | |
| Countryside of Longmont Longmont |
775 | 2 | 14.6 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, 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 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.