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District of Columbia Water Hardness
1 cities · average 6.8 GPG
Average hardness
6.8 GPG
Hardest city
Washington 6.8 GPG
Softest city
Washington 6.8 GPG
Tier distribution
Moderate1
Home › District of Columbia › Hardness map
1 cities · average 6.8 GPG
Average hardness
Hardest city
Softest city