Tapcensus

Chlorite violations in Colorado

5 active public water systems in Colorado had a Chlorite violation in the past three years. What Chlorite is and why it matters.

Health effects: Elevated chlorite in drinking water can cause hemolytic anemia by oxidizing red blood cell membranes. Infants, young children, pregnant women, and individuals with glucose-6-phosphate dehydrogenase (G6PD) deficiency are especially sensitive. Chronic low-level exposure may also affect the nervous system. Most violations reflect localized high levels at specific monitoring points.

Systems with a Chlorite violation

Latest quarter first, then largest first
SystemServesStatusRules violated, 3 yrUnresolved
Greeley City of
Weld County 		132,310 2 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
About this data

A system is counted once if any of its violations in the past three years involved Chlorite, including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not Chlorite 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. Retrieved from ECHO on Oct 11, 2026.