Water Quality in Washington
Water hardness and contaminant data for 11 cities across Washington. Find your city below to see a detailed water quality profile.
11
Cities
27
Avg Hardness (PPM)
104
Hardest City (PPM)
Washington Cities by Water Hardness
| City | Hardness (PPM) | Level | PFAS (ppt) | Source |
|---|---|---|---|---|
| Spokane | 104 | Moderately Hard | 5 | Spokane-Rathdrum Aquifer |
| Bellevue | 26 | Slightly Hard | 4 | Tolt River, Cedar River (Seattle system) |
| Everett | 26 | Slightly Hard | 2 | Spada Lake |
| Yakima | 25 | Slightly Hard | 4 | Naches River, wells |
| Tacoma | 21 | Slightly Hard | 4 | Green River Watershed |
| Seattle | 20 | Soft | 2 | Cedar River + Tolt River |
| Federal Way | 18 | Slightly Hard | 3 | Tacoma Water (Green River), Lakehaven We… |
| Olympia | 17 | Slightly Hard | 3 | McAllister Springs, groundwater |
| Kent | 16 | Soft | 3 | Tacoma Water (Green River), wells |
| Vancouver | 13 | Soft | 2 | Groundwater wells |
| Kirkland | 12 | Soft | 3 | Seattle Water (Cedar/Tolt Rivers) |