2 cities covered
Wisconsin water quality and radon, by city
1 of 2 covered Wisconsin cities use chloramine in at least part of the system, and 2 have hard water. 28 of Wisconsin's 72 counties are EPA radon zone 1.
| City | Disinfectant | Hardness | Lead | PFAS | Radon |
|---|---|---|---|---|---|
| Milwaukee | Chloramine | 7.9 gpg | 5.3 ppb | Not detected | Zone 2 |
| Madison | Chlorine | 19.9 gpg | 1.8 ppb | Detected | Zone 1 |
Wisconsin radon zones
Zone 1 (highest)28 counties
Zone 244 counties
Zone 3 (lowest)0 counties