Private Well Water Testing in Kentucky
County-by-county USGS area-risk estimates for private wells across Kentucky — arsenic exceedance probability and private-well population — plus how to test your own well at a Kentucky-certified laboratory.
Kentucky private-well risk summary
Counties covered
120
Kentucky counties with modeled risk data.
People on private wells
area estimate532,554
estimated across covered Kentucky counties.
Average arsenic risk
area estimate3%
average modeled chance a well exceeds 10 µg/L arsenic across covered counties.
Kentucky counties
- Pike County2% arsenic exceedance (area estimate)40,241 people on private wells
- Letcher County2% arsenic exceedance (area estimate)16,287 people on private wells
- Floyd County2% arsenic exceedance (area estimate)14,417 people on private wells
- Perry County2% arsenic exceedance (area estimate)14,094 people on private wells
- Whitley County2% arsenic exceedance (area estimate)13,913 people on private wells
- Harlan County1% arsenic exceedance (area estimate)13,591 people on private wells
- Knott County2% arsenic exceedance (area estimate)13,585 people on private wells
- Graves County2% arsenic exceedance (area estimate)12,334 people on private wells
- Calloway County2% arsenic exceedance (area estimate)12,046 people on private wells
- Johnson County2% arsenic exceedance (area estimate)10,754 people on private wells
- Hardin County2% arsenic exceedance (area estimate)10,750 people on private wells
- Clay County2% arsenic exceedance (area estimate)10,468 people on private wells
- Morgan County3% arsenic exceedance (area estimate)10,172 people on private wells
- Knox County2% arsenic exceedance (area estimate)9,986 people on private wells
- Lawrence County2% arsenic exceedance (area estimate)9,425 people on private wells
- Greenup County3% arsenic exceedance (area estimate)9,332 people on private wells
- Breathitt County2% arsenic exceedance (area estimate)8,831 people on private wells
- Meade County2% arsenic exceedance (area estimate)8,791 people on private wells
- Carter County2% arsenic exceedance (area estimate)8,360 people on private wells
- Casey County2% arsenic exceedance (area estimate)8,259 people on private wells
- Leslie County2% arsenic exceedance (area estimate)7,809 people on private wells
- Christian County1% arsenic exceedance (area estimate)7,747 people on private wells
- Magoffin County2% arsenic exceedance (area estimate)7,371 people on private wells
- Russell County2% arsenic exceedance (area estimate)7,349 people on private wells
- Grayson County2% arsenic exceedance (area estimate)7,315 people on private wells
- Bell County1% arsenic exceedance (area estimate)7,084 people on private wells
- Breckinridge County2% arsenic exceedance (area estimate)6,944 people on private wells
- Pulaski County2% arsenic exceedance (area estimate)6,746 people on private wells
- Adair County2% arsenic exceedance (area estimate)6,670 people on private wells
- Marshall County2% arsenic exceedance (area estimate)6,368 people on private wells
- Bullitt County14% arsenic exceedance (area estimate)5,703 people on private wells
- McCracken County3% arsenic exceedance (area estimate)5,703 people on private wells
- Larue County2% arsenic exceedance (area estimate)5,686 people on private wells
- Martin County2% arsenic exceedance (area estimate)5,588 people on private wells
- Laurel County2% arsenic exceedance (area estimate)5,311 people on private wells
- Logan County2% arsenic exceedance (area estimate)5,247 people on private wells
- Allen County2% arsenic exceedance (area estimate)5,165 people on private wells
- Elliott County2% arsenic exceedance (area estimate)5,050 people on private wells
- Lewis County5% arsenic exceedance (area estimate)5,014 people on private wells
- Wayne County2% arsenic exceedance (area estimate)4,971 people on private wells
- Barren County1% arsenic exceedance (area estimate)4,774 people on private wells
- Henderson County10% arsenic exceedance (area estimate)4,723 people on private wells
- Metcalfe County1% arsenic exceedance (area estimate)4,712 people on private wells
- Daviess County6% arsenic exceedance (area estimate)4,620 people on private wells
- Monroe County1% arsenic exceedance (area estimate)4,371 people on private wells
- Jefferson County12% arsenic exceedance (area estimate)4,304 people on private wells
- Wolfe County3% arsenic exceedance (area estimate)4,285 people on private wells
- Jackson County2% arsenic exceedance (area estimate)4,211 people on private wells
- Hart County1% arsenic exceedance (area estimate)4,101 people on private wells
- Boyd County2% arsenic exceedance (area estimate)4,025 people on private wells
- Todd County2% arsenic exceedance (area estimate)3,975 people on private wells
- Ballard County4% arsenic exceedance (area estimate)3,964 people on private wells
- McCreary County1% arsenic exceedance (area estimate)3,321 people on private wells
- Taylor County2% arsenic exceedance (area estimate)3,306 people on private wells
- Lincoln County3% arsenic exceedance (area estimate)3,251 people on private wells
- Carlisle County3% arsenic exceedance (area estimate)2,943 people on private wells
- Caldwell County2% arsenic exceedance (area estimate)2,931 people on private wells
- Nelson County12% arsenic exceedance (area estimate)2,901 people on private wells
- Livingston County2% arsenic exceedance (area estimate)2,872 people on private wells
- Crittenden County3% arsenic exceedance (area estimate)2,742 people on private wells
- Hickman County4% arsenic exceedance (area estimate)2,699 people on private wells
- Webster County5% arsenic exceedance (area estimate)2,662 people on private wells
- Clinton County2% arsenic exceedance (area estimate)2,642 people on private wells
- Ohio County4% arsenic exceedance (area estimate)2,606 people on private wells
- Green County1% arsenic exceedance (area estimate)2,490 people on private wells
- Rowan County3% arsenic exceedance (area estimate)2,252 people on private wells
- Hancock County2% arsenic exceedance (area estimate)2,015 people on private wells
- Owsley County2% arsenic exceedance (area estimate)1,983 people on private wells
- Butler County5% arsenic exceedance (area estimate)1,927 people on private wells
- Lyon County2% arsenic exceedance (area estimate)1,927 people on private wells
- Trigg County1% arsenic exceedance (area estimate)1,782 people on private wells
- Menifee County3% arsenic exceedance (area estimate)1,761 people on private wells
- Rockcastle County4% arsenic exceedance (area estimate)1,758 people on private wells
- Lee County3% arsenic exceedance (area estimate)1,754 people on private wells
- Fleming County6% arsenic exceedance (area estimate)1,679 people on private wells
- Washington County1% arsenic exceedance (area estimate)1,611 people on private wells
- Hopkins County5% arsenic exceedance (area estimate)1,580 people on private wells
- Bath County8% arsenic exceedance (area estimate)1,534 people on private wells
- Powell County3% arsenic exceedance (area estimate)1,484 people on private wells
- Shelby County4% arsenic exceedance (area estimate)1,472 people on private wells
- Union County18% arsenic exceedance (area estimate)1,446 people on private wells
- Clark County2% arsenic exceedance (area estimate)1,433 people on private wells
- Boone County5% arsenic exceedance (area estimate)1,412 people on private wells
- Warren County2% arsenic exceedance (area estimate)1,323 people on private wells
- Edmonson County2% arsenic exceedance (area estimate)1,281 people on private wells
- Bourbon County2% arsenic exceedance (area estimate)1,269 people on private wells
- Cumberland County2% arsenic exceedance (area estimate)1,228 people on private wells
- McLean County8% arsenic exceedance (area estimate)1,222 people on private wells
- Muhlenberg County4% arsenic exceedance (area estimate)1,221 people on private wells
- Madison County2% arsenic exceedance (area estimate)1,205 people on private wells
- Marion County2% arsenic exceedance (area estimate)1,135 people on private wells
- Scott County2% arsenic exceedance (area estimate)1,096 people on private wells
- Estill County3% arsenic exceedance (area estimate)1,068 people on private wells
- Montgomery County4% arsenic exceedance (area estimate)1,013 people on private wells
- Oldham County11% arsenic exceedance (area estimate)1,007 people on private wells
- Boyle County1% arsenic exceedance (area estimate)990 people on private wells
- Henry County5% arsenic exceedance (area estimate)949 people on private wells
- Mercer County2% arsenic exceedance (area estimate)939 people on private wells
- Spencer County4% arsenic exceedance (area estimate)903 people on private wells
- Owen County5% arsenic exceedance (area estimate)899 people on private wells
- Kenton County6% arsenic exceedance (area estimate)890 people on private wells
- Fulton County5% arsenic exceedance (area estimate)870 people on private wells
- Campbell County5% arsenic exceedance (area estimate)846 people on private wells
- Fayette County2% arsenic exceedance (area estimate)803 people on private wells
- Nicholas County3% arsenic exceedance (area estimate)793 people on private wells
- Jessamine County3% arsenic exceedance (area estimate)786 people on private wells
- Grant County4% arsenic exceedance (area estimate)769 people on private wells
- Garrard County3% arsenic exceedance (area estimate)753 people on private wells
- Anderson County3% arsenic exceedance (area estimate)738 people on private wells
- Mason County2% arsenic exceedance (area estimate)696 people on private wells
- Woodford County3% arsenic exceedance (area estimate)668 people on private wells
- Franklin County5% arsenic exceedance (area estimate)641 people on private wells
- Gallatin County5% arsenic exceedance (area estimate)607 people on private wells
- Simpson County2% arsenic exceedance (area estimate)603 people on private wells
- Harrison County2% arsenic exceedance (area estimate)561 people on private wells
- Trimble County3% arsenic exceedance (area estimate)500 people on private wells
- Pendleton County5% arsenic exceedance (area estimate)470 people on private wells
- Carroll County4% arsenic exceedance (area estimate)462 people on private wells
- Bracken County2% arsenic exceedance (area estimate)439 people on private wells
- Robertson County2% arsenic exceedance (area estimate)193 people on private wells
Find a Kentucky-certified testing lab
Get your well tested at a Kentucky-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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