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Ontario Water Hardness

5 cities ranked by hardness.

Guelph

19.2 GPG · 328 ppm
Very Hard

Barrie

13.4 GPG · 229 ppm
Very Hard

Kingston

11.6 GPG · 198 ppm
Hard

Windsor

9.8 GPG · 168 ppm
Hard

Thunder Bay

5.8 GPG · 99 ppm
Moderate