Private Well Water Testing in Oklahoma
County-by-county USGS area-risk estimates for private wells across Oklahoma — arsenic exceedance probability and private-well population — plus how to test your own well at a Oklahoma-certified laboratory.
Oklahoma private-well risk summary
Counties covered
77
Oklahoma counties with modeled risk data.
People on private wells
area estimate469,250
estimated across covered Oklahoma counties.
Average arsenic risk
area estimate4%
average modeled chance a well exceeds 10 µg/L arsenic across covered counties.
Oklahoma counties
- Oklahoma County4% arsenic exceedance (area estimate)52,512 people on private wells
- Cleveland County4% arsenic exceedance (area estimate)33,070 people on private wells
- Pottawatomie County4% arsenic exceedance (area estimate)25,329 people on private wells
- Grady County3% arsenic exceedance (area estimate)18,701 people on private wells
- Lincoln County5% arsenic exceedance (area estimate)18,454 people on private wells
- Delaware County1% arsenic exceedance (area estimate)18,449 people on private wells
- McClain County3% arsenic exceedance (area estimate)13,928 people on private wells
- Creek County8% arsenic exceedance (area estimate)13,256 people on private wells
- Cherokee County1% arsenic exceedance (area estimate)12,421 people on private wells
- Logan County4% arsenic exceedance (area estimate)12,388 people on private wells
- Canadian County3% arsenic exceedance (area estimate)11,763 people on private wells
- McCurtain County1% arsenic exceedance (area estimate)10,671 people on private wells
- Adair County1% arsenic exceedance (area estimate)10,314 people on private wells
- Caddo County3% arsenic exceedance (area estimate)9,929 people on private wells
- Payne County6% arsenic exceedance (area estimate)9,070 people on private wells
- Stephens County3% arsenic exceedance (area estimate)8,762 people on private wells
- Garfield County6% arsenic exceedance (area estimate)8,523 people on private wells
- Bryan County2% arsenic exceedance (area estimate)8,350 people on private wells
- Seminole County6% arsenic exceedance (area estimate)7,920 people on private wells
- Sequoyah County2% arsenic exceedance (area estimate)7,362 people on private wells
- Mayes County2% arsenic exceedance (area estimate)7,284 people on private wells
- Carter County3% arsenic exceedance (area estimate)7,170 people on private wells
- Le Flore County2% arsenic exceedance (area estimate)6,351 people on private wells
- Comanche County5% arsenic exceedance (area estimate)5,977 people on private wells
- Garvin County3% arsenic exceedance (area estimate)5,872 people on private wells
- Osage County7% arsenic exceedance (area estimate)5,720 people on private wells
- Choctaw County2% arsenic exceedance (area estimate)5,716 people on private wells
- Ottawa County2% arsenic exceedance (area estimate)5,558 people on private wells
- Tulsa County8% arsenic exceedance (area estimate)4,578 people on private wells
- Pontotoc County6% arsenic exceedance (area estimate)4,282 people on private wells
- Haskell County4% arsenic exceedance (area estimate)4,194 people on private wells
- Atoka County3% arsenic exceedance (area estimate)4,077 people on private wells
- Pawnee County8% arsenic exceedance (area estimate)3,948 people on private wells
- Pushmataha County2% arsenic exceedance (area estimate)3,833 people on private wells
- Beckham County4% arsenic exceedance (area estimate)3,691 people on private wells
- Woodward County3% arsenic exceedance (area estimate)3,627 people on private wells
- Wagoner County5% arsenic exceedance (area estimate)3,616 people on private wells
- McIntosh County4% arsenic exceedance (area estimate)3,501 people on private wells
- Muskogee County4% arsenic exceedance (area estimate)3,499 people on private wells
- Kay County8% arsenic exceedance (area estimate)3,339 people on private wells
- Custer County3% arsenic exceedance (area estimate)3,258 people on private wells
- Pittsburg County4% arsenic exceedance (area estimate)3,147 people on private wells
- Kingfisher County6% arsenic exceedance (area estimate)3,141 people on private wells
- Major County4% arsenic exceedance (area estimate)3,014 people on private wells
- Rogers County8% arsenic exceedance (area estimate)3,007 people on private wells
- Hughes County6% arsenic exceedance (area estimate)2,985 people on private wells
- Texas County6% arsenic exceedance (area estimate)2,941 people on private wells
- Okfuskee County7% arsenic exceedance (area estimate)2,670 people on private wells
- Beaver County4% arsenic exceedance (area estimate)2,664 people on private wells
- Blaine County4% arsenic exceedance (area estimate)2,545 people on private wells
- Marshall County2% arsenic exceedance (area estimate)2,541 people on private wells
- Love County3% arsenic exceedance (area estimate)2,428 people on private wells
- Johnston County2% arsenic exceedance (area estimate)2,390 people on private wells
- Washita County4% arsenic exceedance (area estimate)2,178 people on private wells
- Craig County3% arsenic exceedance (area estimate)1,706 people on private wells
- Jackson County3% arsenic exceedance (area estimate)1,594 people on private wells
- Murray County3% arsenic exceedance (area estimate)1,563 people on private wells
- Noble County4% arsenic exceedance (area estimate)1,524 people on private wells
- Okmulgee County5% arsenic exceedance (area estimate)1,503 people on private wells
- Roger Mills County3% arsenic exceedance (area estimate)1,393 people on private wells
- Ellis County3% arsenic exceedance (area estimate)1,294 people on private wells
- Dewey County3% arsenic exceedance (area estimate)1,290 people on private wells
- Harmon County3% arsenic exceedance (area estimate)1,197 people on private wells
- Alfalfa County4% arsenic exceedance (area estimate)902 people on private wells
- Washington County4% arsenic exceedance (area estimate)848 people on private wells
- Jefferson County5% arsenic exceedance (area estimate)839 people on private wells
- Woods County3% arsenic exceedance (area estimate)800 people on private wells
- Latimer County2% arsenic exceedance (area estimate)785 people on private wells
- Cotton County7% arsenic exceedance (area estimate)783 people on private wells
- Coal County5% arsenic exceedance (area estimate)742 people on private wells
- Cimarron County10% arsenic exceedance (area estimate)697 people on private wells
- Kiowa County4% arsenic exceedance (area estimate)689 people on private wells
- Nowata County4% arsenic exceedance (area estimate)679 people on private wells
- Tillman County5% arsenic exceedance (area estimate)661 people on private wells
- Harper County3% arsenic exceedance (area estimate)636 people on private wells
- Grant County6% arsenic exceedance (area estimate)625 people on private wells
- Greer County3% arsenic exceedance (area estimate)586 people on private wells
Find a Oklahoma-certified testing lab
Get your well tested at a Oklahoma-certified laboratory. We list certification programs by state.
These figures are USGS area estimates: statistical groundwater models describing how likely elevated contaminant levels are across a county. They are not designed to predict the concentration in any single well. Only testing your own well reveals its water quality.
By TapWaterData Editorial
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