5 cities covered
Washington water quality and radon, by city
0 of 5 covered Washington cities use chloramine in at least part of the system, and 1 have hard water. 7 of Washington's 39 counties are EPA radon zone 1.
| City | Disinfectant | Hardness | Lead | PFAS | Radon |
|---|---|---|---|---|---|
| Seattle | Chlorine | 1.8 gpg | 1.6 ppb | Not detected | Zone 3 |
| Spokane | Chlorine | 7.7 gpg | 2 ppb | PFOS | Zone 1 |
| Tacoma | Chlorine | 1.3 gpg | Not detected | Detected | Zone 3 |
| Vancouver | Chlorine | 5.8 gpg | 2.2 ppb | PFOS, PFOA | Zone 1 |
| Bellevue | Chlorine | 2.0 gpg | No data | Not detected | Zone 3 |
Washington radon zones
Zone 1 (highest)7 counties
Zone 214 counties
Zone 3 (lowest)18 counties