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Washington Water Hardness
2 cities · average 4.8 GPG
Average hardness
4.8 GPG
Hardest city
Spokane 7.7 GPG
Softest city
Seattle 1.8 GPG
Tier distribution
Hard1Soft1
Home › Washington › Hardness map
2 cities · average 4.8 GPG
Average hardness
Hardest city
Softest city