Results from 3,838 water districts’ own annual reports and EPA testing, by state. Each district page lists every number we read, what it means and what removes it.
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- Alabama19 districts
- Alaska4 districts
- Arizona28 districts
- Arkansas609 districts
- California300 districts
- Colorado37 districts
- Connecticut20 districts
- Delaware10 districts
- District of Columbia1 district
- Florida92 districts
- Georgia28 districts
- Hawaii7 districts
- Idaho7 districts
- Illinois73 districts
- Indiana22 districts
- Iowa12 districts
- Kansas12 districts
- Kentucky21 districts
- Louisiana7 districts
- Maine2 districts
- Maryland26 districts
- Massachusetts88 districts
- Michigan43 districts
- Minnesota32 districts
- Mississippi45 districts
- Missouri1038 districts
- Montana3 districts
- Nebraska5 districts
- Nevada4 districts
- New Hampshire7 districts
- New Jersey48 districts
- New Mexico12 districts
- New York58 districts
- North Carolina38 districts
- North Dakota2 districts
- Northern Mariana Islands1 district
- Ohio54 districts
- Oklahoma15 districts
- Oregon18 districts
- Pennsylvania62 districts
- Rhode Island11 districts
- South Carolina21 districts
- South Dakota375 districts
- Tennessee41 districts
- Texas119 districts
- Tribal water systems2 districts
- Utah32 districts
- Vermont224 districts
- Virginia24 districts
- Washington41 districts
- West Virginia7 districts
- Wisconsin26 districts
- Wyoming5 districts