Tap water hardness in Oklahoma
We have published hardness data for 3 cities in Oklahoma. The median is 6.7 gpg; the hardest water is in Owasso (7.7 gpg), the softest in Norman (5.1 gpg).
33 % of these cities have hard or very hard water (over 120 mg/L).
USGS classes: soft 0–60, moderately hard 61–120, hard 121–180, very hard >180 mg/L.
Cities in Oklahoma, hardest first
| gpg | mg/L | ||
|---|---|---|---|
| Owasso | 7.7 | 132 | hard |
| Tulsa | 6.7 | 115 | moderately hard |
| Norman | 5.1 | 88 | moderately hard |
On a private well? Well water hardness in Oklahoma by county →