COUNTY WATER-SYSTEM LEDGER
Boulder, Colorado
EPA’s September 2026 export lists 9 active community water systems serving Boulder, Colorado, with 0 current-violation flags and 0 serious-violator flags among the covered systems.
Source: EPA SDWIS system-search export · Active community systems serving 2,500+ people · Snapshot 13 Sep 2026
01 / SYSTEMS
Water systems serving Boulder, Colorado
EPA associates 9 covered systems with Boulder, Colorado; their reported population-served values total 411,747 and may overlap.
Ordered by reported population served. Open any record for separate health, monitoring, notice, other, and serious-violator flags.
| Water system | Population served | Primary source | Current export status |
|---|---|---|---|
| Boulder City OfCO0107152 | 166,080 | Surface water | No current violation flagged |
| Longmont City OfCO0107485 | 104,178 | Surface water | No current violation flagged |
| Erie Town OfCO0162255 | 47,444 | Surface water | No current violation flagged |
| Lafayette City OfCO0107473 | 28,700 | Surface water | No current violation flagged |
| Louisville City OfCO0107487 | 20,975 | Surface water | No current violation flagged |
| Left Hand WdCO0107471 | 20,280 | Surface water | No current violation flagged |
| Superior Md No 1CO0107725 | 17,900 | Surface water | No current violation flagged |
| Longs Peak WdCO0107486 | 3,200 | Surface water | No current violation flagged |
| Lyons Town OfCO0107496 | 2,990 | Surface water purchased | No current violation flagged |
02 / SOURCE MIX
Primary water sources for Boulder, Colorado
EPA classifies 9 systems serving Boulder, Colorado across 2 primary-source categories; Surface water is the largest category with 8 systems.
It is the sum of each listed system's reported population served, not a census estimate. Service areas can overlap and some systems list multiple cities or counties.