Water Hardness in Oklahoma

77 counties — Average 424.9 PPM (Very Hard)

4
9
7
57
Soft (5.2%) Moderate (11.7%) Hard (9.1%) Very Hard (74.0%)

Oklahoma Water Hardness Map

Soft   Moderate   Hard   Very Hard

Hardest Water Counties

Alfalfa660 PPM
Beaver420 PPM
Beckham900 PPM
Blaine400 PPM
Bryan220 PPM
Caddo520 PPM
Canadian412 PPM
Carter360 PPM
Cimarron448 PPM
Cleveland210 PPM
Cotton200 PPM
Craig191.9 PPM
+45 more
Oklahoma

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All 77 Counties — By Water Hardness

CountyClassificationHardness
Adair Moderate 110 PPM
Alfalfa Very Hard 660 PPM
Atoka Moderate 120 PPM
Beaver Very Hard 420 PPM
Beckham Very Hard 900 PPM
Blaine Very Hard 400 PPM
Bryan Very Hard 220 PPM
Caddo Very Hard 520 PPM
Canadian Very Hard 412 PPM
Carter Very Hard 360 PPM
Cherokee Moderate 100 PPM
Choctaw Hard 163 PPM
Cimarron Very Hard 448 PPM
Cleveland Very Hard 210 PPM
Coal Moderate 105 PPM
Comanche Moderate 76 PPM
Cotton Very Hard 200 PPM
Craig Very Hard 191.9 PPM
Creek Very Hard 270 PPM
Custer Very Hard 940 PPM
Delaware Moderate 120 PPM
Dewey Very Hard 1901.7 PPM
Ellis Very Hard 288 PPM
Garfield Very Hard 320 PPM
Garvin Very Hard 386 PPM
Grady Very Hard 400 PPM
Grant Very Hard 376 PPM
Greer Very Hard 1900 PPM
Harmon Very Hard 2200 PPM
Harper Very Hard 570 PPM
Haskell Very Hard 250 PPM
Hughes Very Hard 300 PPM
Jackson Very Hard 1910 PPM
Jefferson Very Hard 509 PPM
Johnston Very Hard 250 PPM
Kay Very Hard 340 PPM
Kingfisher Very Hard 710 PPM
Kiowa Very Hard 580 PPM
Latimer Soft 33 PPM
Le Flore Soft 36 PPM
Lincoln Very Hard 280 PPM
Logan Very Hard 330 PPM
Love Very Hard 560 PPM
Major Very Hard 680 PPM
Marshall Very Hard 315 PPM
Mayes Moderate 105 PPM
McClain Very Hard 368 PPM
McCurtain Soft 19 PPM
McIntosh Hard 167 PPM
Murray Very Hard 305 PPM
Muskogee Hard 180 PPM
Noble Very Hard 310 PPM
Nowata Very Hard 202 PPM
Okfuskee Hard 166.5 PPM
Oklahoma Very Hard 270 PPM
Okmulgee Very Hard 220 PPM
Osage Very Hard 184 PPM
Ottawa Very Hard 200 PPM
Pawnee Very Hard 280 PPM
Payne Very Hard 460 PPM
Pittsburg Moderate 66 PPM
Pontotoc Very Hard 261 PPM
Pottawatomie Very Hard 233.5 PPM
Pushmataha Soft 20 PPM
Roger Mills Very Hard 445 PPM
Rogers Hard 180 PPM
Seminole Very Hard 370 PPM
Sequoyah Moderate 82 PPM
Stephens Very Hard 550 PPM
Texas Very Hard 240 PPM
Tillman Very Hard 1020 PPM
Tulsa Very Hard 260 PPM
Wagoner Hard 130 PPM
Washington Hard 180 PPM
Washita Very Hard 1194.4 PPM
Woods Very Hard 1000 PPM
Woodward Very Hard 680 PPM

Source: USGS Water Quality Portal

Frequently Asked Questions

How hard is the water in Oklahoma?

Oklahoma has an average water hardness of 424.9 PPM, classified as very hard. Out of 77 counties, 4 have soft water, 9 moderately hard, 7 hard, and 57 very hard.

Which Oklahoma counties have the hardest water?

Oklahoma has 57 counties with very hard water (above 180 mg/L). See the county table above for a complete breakdown by hardness level.

How do I check water hardness for my Oklahoma address?

Enter your ZIP code in the search box above to see your area's estimated water hardness, classification, and water utility information.