O Fallon, MO vs Abbeville, AL

When comparing tap water quality between O Fallon, MO and Abbeville, AL, O Fallon currently holds a substantial 34-point lead in average WaterQ score, with a score of 82 out of 100 versus 48 for Abbeville. O Fallon, MO carries a B grade while Abbeville, AL carries a D. A WaterQ score reflects an aggregate of EPA-reported violations, monitoring data, and compliance history across all public water systems serving each city, so a higher score generally indicates fewer recent violations and a stronger compliance record, though it does not guarantee that every tap in the city tests identically.

O Fallon, MO is the larger of the two, with 123,986 more residents than Abbeville. O Fallon is served by 5 public water systems, compared with 2 in Abbeville — a difference of 3 systems. A larger number of systems often reflects a more fragmented distribution network spanning multiple utilities, suburbs, or rural service areas, while a single large utility serving a big population can benefit from economies of scale in treatment and monitoring, but may also face more complex, aging infrastructure to maintain.

For residents of either O Fallon or Abbeville, the most useful next step is to look up the specific water system that serves your address, since city-wide averages combine results from every system in the area. Visit the O Fallon or Abbeville city pages below for a breakdown of local systems, recent violations, and contaminant-specific data, or browse WaterQ's contaminants directory to learn what each measured substance means for health.