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Oklahoma Water Hardness
Across the 2 cities we track in Oklahoma, hardness ranges from 4.2–6.7 GPG — no city runs hard or very hard, and 4 more cities don't publish a figure.
2 cities tracked. View the Oklahoma hardness map → · Is Oklahoma water safe to drink? →
Cities with no published figure
These Oklahoma cities don't publish a hardness number (it isn't a regulated parameter), so they can't be ranked — but we still track them. See each page for how to check your own tap.