waterbycounty

Kentucky Water Quality

Drinking water data for all 120 counties.

Avg Water Score

64.2

State Grade

C

Counties with Data

118

of 120 total

All Kentucky Counties

CountyWater Score
Allen County86.0
Ballard County86.0
Barren County86.0
Boone County86.0
Boyle County86.0
Bracken County86.0
Breckinridge County86.0
Bullitt County86.0
Caldwell County86.0
Calloway County86.0
Carlisle County86.0
Casey County86.0
Christian County86.0
Clark County86.0
Daviess County86.0
Elliott County86.0
Fayette County86.0
Fleming County86.0
Franklin County86.0
Gallatin County86.0
Garrard County86.0
Graves County86.0
Grayson County86.0
Green County86.0
Hancock County86.0
Hart County86.0
Henderson County86.0
Henry County86.0
Hickman County86.0
Jefferson County86.0
Johnson County86.0
Kenton County86.0
Knott County86.0
Larue County86.0
Lawrence County86.0
Lee County86.0
Leslie County86.0
Lewis County86.0
Marshall County86.0
Mason County86.0
McCracken County86.0
McCreary County86.0
Meade County86.0
Metcalfe County86.0
Nicholas County86.0
Oldham County86.0
Pendleton County86.0
Perry County86.0
Powell County86.0
Pulaski County86.0
Robertson County86.0
Rockcastle County86.0
Scott County86.0
Shelby County86.0
Simpson County86.0
Spencer County86.0
Taylor County86.0
Trigg County86.0
Trimble County86.0
Warren County86.0
Washington County86.0
Wayne County86.0
Wolfe County86.0
Hardin County70.6
Madison County69.7
Laurel County69.0
Marion County64.0
Adair County63.4
Butler County60.8
Todd County60.1
Estill County59.6
Bell County59.3
Grant County55.8
Morgan County55.4
Mercer County53.9
Knox County53.3
Bourbon County52.7
Lincoln County52.0
Carter County51.8
Rowan County51.1
Clay County48.9
Owsley County48.2
Boyd County47.8
Woodford County46.0
Ohio County45.5
Jessamine County43.3
Nelson County41.8
Russell County41.4
Cumberland County40.8
Greenup County40.1
Harlan County39.5
Harrison County39.4
Anderson County39.0
Hopkins County38.2
Carroll County37.5
Clinton County35.6
Fulton County33.7
Jackson County33.0
Martin County32.5
Pike County31.0
Bath County29.0
Logan County28.8
Whitley County28.7
Magoffin County28.1
Floyd County27.2
Muhlenberg County25.8
Monroe County22.8
Lyon County21.5
Crittenden County20.0
Menifee County18.4
Montgomery County18.4
Breathitt County18.2
Letcher County14.8
Edmonson County14.6
Livingston County12.6
McLean County12.4
Union County7.3
Webster County5.1
Campbell County—
Owen County—

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Frequently Asked Questions

Which county in Kentucky has the best water quality?
Allen County has the highest water quality score in Kentucky at 86.0/100 (Grade: A), based on EPA SDWIS data.
Which county in Kentucky has the most water violations?
Webster County has among the lowest water quality scores in Kentucky at 5.1/100. See the individual county page for detailed violation history.
Is the tap water safe to drink in Kentucky?
Kentucky has an average water quality score of 64.2/100 based on EPA Safe Drinking Water Act compliance data. Individual county scores vary — check your specific county's page for detailed information.
What contaminants are found in Kentucky water supplies?
Drinking water quality varies by county and water system. The EPA Safe Drinking Water Information System (SDWIS) tracks violations for contaminants like lead, nitrates, bacteria, and disinfection byproducts. See individual county pages for specific contaminant and violation history.

Data Source

Water quality data sourced from the EPA Safe Drinking Water Information System (SDWIS) via the ECHO enforcement database. Scores reflect compliance history and health-based violation counts.

Disclaimer: This data is informational only. It is not health, legal, or professional advice. For concerns about your specific water supply, contact your local water utility.

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