| Caseyville | 464.947 µg/L (on 9/26/2018) | IL |
|---|---|---|
| Aqua PA - Roaring Creek | 99.58 µg/L (on 9/25/2018) | PA |
| Augusta-Richmond Co. Water | 99.5 µg/L (on 3/16/2020) | GA |
| Aqua PA - Shenango Valley | 99.3 µg/L (on 7/18/2018) | PA |
| German Township Water District, Inc. | 99.283 µg/L (on 6/10/2020) | IN |
| Marshall County Water Corp. | 99.197 µg/L (on 8/6/2019) | OK |
| Nueces County WCID #3 | 99.1 µg/L (on 5/27/2020) | TX |
| Paris Waterworks | 99 µg/L (on 7/22/2019) | KY |
| South Central Water Assn. | 98.69 µg/L (on 3/25/2019) | MS |
| DeKalb Utility District #1 | 98.5 µg/L (on 4/22/2019) | TN |