Water Quality Articles
Data-driven analysis of drinking water quality across US counties — rankings, violation reports, and insights built on EPA Safe Drinking Water data.
March 10, 2026
Understanding Drinking Water Quality by County
A data-driven analysis of drinking water quality across all US counties. How EPA SDWIS data reveals geographic patterns, grade distributions, and what drives water quality differences.
March 14, 2026
EPA Water Violations: What They Mean for Your Tap Water
What EPA drinking water violations actually mean, the different types of violations, which counties have the most, and what you can do if your county has a low water quality score.
March 19, 2026
Best and Worst Counties for Water Quality in America
The 25 best and 25 worst counties for drinking water quality in the United States, ranked by EPA compliance data. Geographic patterns, common factors, and what it means for residents.
May 5, 2026
Rural vs Urban Water Quality by County
How drinking water quality differs between rural and urban counties in America. Comparing EPA compliance data, population-normalized violation rates, and scores by county characteristics.
May 9, 2026
Water Quality Grade Distribution Across US Counties
How many US counties earn A, B, C, D, or F grades for drinking water quality? A complete breakdown of the national grade distribution using EPA SDWIS data.