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Ontario Water Hardness

5 cities · average 12.0 GPG

Average hardness

12.0 GPG

Hardest city

Guelph 19.2 GPG

Softest city

Thunder Bay 5.8 GPG

Tier distribution

Very Hard2Hard2Moderate1

Cities ranked by hardness

1Guelph19.2 GPGVery Hard2Barrie13.4 GPGVery Hard3Kingston11.6 GPGHard4Windsor9.8 GPGHard5Thunder Bay5.8 GPGModerate