St Charles

St Charles, MO receives a water quality score of 84/100 (Grade B) based on EPA Safe Drinking Water Information System (SDWIS) compliance data for 2 public water systems serving the area.

St Charles's water quality is above the national average, with strong compliance records and low contaminant levels. Residents generally receive clean, safe tap water that meets EPA standards.

St Charles's score of 84 is 4 points above the Missouri state average of 80, and above the nationwide average of roughly 78/100 across all U.S. states.

For residents of St. Charles, tap water quality is closely tied to its Midwestern regional setting, where the Mississippi and Missouri rivers meet amidst agricultural plains. Serving this mid-size Missouri city are two separate water systems, meaning that prospective homebuyers should note which system serves a potential property. Overall, local households can expect reliable, above-average water quality, though the surrounding agricultural plains and river confluence require diligent treatment management. This combination of two utility systems and a unique river confluence setting defines the everyday water experience in the community.

Water quality data is sourced from the U.S. EPA SDWIS database and updated quarterly. Learn about our scoring methodology → Read our Missouri water quality rankings report →