Chlorine dioxide violations in Colorado
6 active public water systems in Colorado had a Chlorine dioxide violation in the past three years. What Chlorine dioxide is and why it matters.
Systems with a Chlorine dioxide violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
FT Collins City of Larimer County |
179,901 | 4 | 0 | |
|
Parker Wsd Douglas County |
75,949 | 4 | 0 | |
|
Montezuma WC Montezuma County |
13,797 | 3 | 1 | |
|
FT Morgan City of Morgan County |
12,000 | 1 | 0 | |
|
Wellington Town of Larimer County |
11,720 | 5 | 0 | |
|
East End WA Otero County |
70 | 5 | 1 |
About this data
A system is counted once if any of its violations in the past three years involved Chlorine dioxide, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Chlorine dioxide alone.
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.