N Swanzey, NH vs Manchester, NH

When comparing tap water quality between N Swanzey, NH and Manchester, NH, Manchester currently holds a narrow 2-point edge in average WaterQ score, with a score of 100 out of 100 versus 98 for N Swanzey. Both cities currently carry an A grade overall. 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.

Manchester, NH is the larger of the two, with 122,100 more residents than N Swanzey, yet both cities are served by the same number of public water systems (1). This means the difference in population is handled by systems of different scale rather than a different count of utilities — larger systems generally serve more connections and may have more monitoring requirements under the Safe Drinking Water Act.

For residents of either N Swanzey or Manchester, 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 N Swanzey or Manchester 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.