| Pierre | 2600 µg/L (on 3/27/2018) | SD |
|---|---|---|
| E. Bangor Municipal Authority | 2500 µg/L (on 3/14/2018) | PA |
| City of Phoenix | 992 µg/L (on 2/7/2019) | AZ |
| Oconee Co. - Watkinsville | 947 µg/L (on 9/11/2019) | GA |
| WMAUA Miner Flat | 920 µg/L (on 11/27/2018) | 09 |
| Swansea Water District | 919 µg/L (on 7/16/2019) | MA |
| Pebble Hill Mobile Home Park | 879.65 µg/L (on 1/22/2019) | NY |
| Monticello | 872 µg/L (on 1/8/2020) | MN |
| Hecla Water Association | 868.05 µg/L (on 9/4/2019) | OH |
| East Lyme Water & Sewer Commission | 828 µg/L (on 9/21/2018) | CT |