waterbycounty
Compiled federal source snapshot

Kentucky Water Quality

Drinking water data for all 98 counties.

Avg SDWIS Compliance Index

65.9

Most Common Five-Year SDWIS Compliance Band

A

Counties with Data

98

of 98 total

County water atlas

Kentucky water signals by county

A state-level 2.5D view across drinking-water compliance, watershed impairment, monitoring density, and streamflow snapshot context. Pin any county, switch layers, then use the lens controls to compare index ranges, recorded violation rates, or impaired watersheds without leaving the page.

Counties

98

Avg SDWIS index

65.9

Watersheds

0

ATTAINS counties

Monitoring

98

56 fresh USGS snapshots

State atlas layers combine EPA SDWIS health-based violations, EPA ATTAINS 303(d) impairment assessments, EPA Water Quality Portal monitoring sites, and representative USGS NWIS streamflow gauges. Streamflow values appear only for fresh pipeline snapshots, not as a continuously updated stream. County pages include the observation time and year.

Prepared by ByCounty Editorial TeamPublished by WaterByCounty

Multi-source coverage in Kentucky

Beyond Drinking Water

EPA SDWIS

98/ 98

counties with drinking-water compliance data

246 health violations statewide (5yr)

EPA ATTAINS

—

No §303(d) assessments yet for Kentucky

EPA WQP

470

monitoring sites across 98 counties

233,369 total readings (5yr window)

USGS NWIS

56

counties with a fresh pipeline snapshot

1 above55 below

State atlas notes

What stands out in Kentucky

County water quality is not one number. The strongest read comes from comparing drinking-water compliance against watershed impairment, monitoring density, and streamflow context. Use these signals as a starting point, then open any county profile for source-level detail.

Compliance spread

Allen County has the highest value in the published state SDWIS Compliance Index table at 86.2/100, while Union County has the lowest at 6.6/100. That is a 79.6 point gap inside one state.

Zero health violations

53

3+ health violations

23

Monitoring hubs

Jefferson County27 sitesBallard County17 sitesHenderson County16 sites

Lowest flow reads

Bracken County1%Kenton County3%Fleming County4%

Highest fresh streamflow pipeline snapshots: Pulaski County (268%, observation 2026), Crittenden County (77%, observation 2026), Leslie County (41%, observation 2026). These are source-data observations, not household tap-water conclusions.

All Kentucky Counties

CountySDWIS Compliance Index
Allen County86.2
Ballard County86.2
Barren County86.2
Bell County86.2
Boone County86.2
Bracken County86.2
Breckinridge County86.2
Bullitt County86.2
Caldwell County86.2
Carlisle County86.2
Christian County86.2
Clark County86.2
Daviess County86.2
Elliott County86.2
Estill County86.2
Fleming County86.2
Franklin County86.2
Gallatin County86.2
Garrard County86.2
Graves County86.2
Green County86.2
Hancock County86.2
Hart County86.2
Henderson County86.2
Henry County86.2
Hickman County86.2
Jefferson County86.2
Johnson County86.2
Kenton County86.2
Larue County86.2
Lawrence County86.2
Lee County86.2
Leslie County86.2
Lewis County86.2
Marshall County86.2
McCracken County86.2
McCreary County86.2
Metcalfe County86.2
Nicholas County86.2
Oldham County86.2
Pendleton County86.2
Perry County86.2
Powell County86.2
Pulaski County86.2
Rockcastle County86.2
Shelby County86.2
Spencer County86.2
Trigg County86.2
Trimble County86.2
Warren County86.2
Washington County86.2
Wayne County86.2
Wolfe County86.2
Hardin County70.3
Madison County68.8
Laurel County67.8
Meade County64.5
Grant County62.6
Carter County61.6
Adair County59.3
Jessamine County57.6
Butler County56.2
Boyd County55.9
Todd County55.2
Bourbon County54.9
Harrison County51.8
Anderson County51.2
Greenup County49.3
Clinton County47.6
Martin County47.6
Clay County46.7
Hopkins County46.4
Calloway County45.5
Jackson County45.0
Whitley County44.0
Carroll County43.1
Bath County40.6
Pike County40.5
Harlan County39.7
Owsley County39.6
Ohio County39.1
Floyd County38.1
Morgan County38.1
Logan County36.2
Muhlenberg County34.8
Fulton County34.5
Crittenden County30.2
Montgomery County29.1
Menifee County27.7
Monroe County27.6
Lyon County26.9
Breathitt County26.2
Edmonson County20.7
McLean County18.1
Letcher County17.5
Livingston County15.7
Webster County7.4
Union County6.6

Frequently Asked Questions

Which Kentucky county has the highest SDWIS Compliance Index?
Allen County has the highest SDWIS Compliance Index in the published Kentucky cohort at 86.2/100. This WaterByCounty relative comparison is not an EPA score and does not establish current conditions for a utility or address.
What does the Five-Year SDWIS Compliance Band mean?
The band is derived only from each county aggregation's recorded health-violation rate per 100,000 people served for the stated five-year source window. It is separate from the relative SDWIS Compliance Index and is not a current determination for a specific utility or address.
Which USGS streamflow records are shown across Kentucky?
WaterByCounty has 56 fresh USGS pipeline snapshots in the published Kentucky cohort. Each county page shows its observation timestamp and year. A pipeline snapshot is not a continuously updated reading or a tap-water safety measure.
Where can Kentucky residents find current official information?
Review the applicable utility's Consumer Confidence Report, active notices, and the state drinking-water agency. WaterByCounty's county-level historical aggregations do not establish the current status of a specific utility, address, private well, or household plumbing system.
What does Water Quality Portal monitoring volume show in Kentucky?
The published county records contain 233,369 results from 470 monitoring locations in the site's five-year aggregation. Monitoring volume does not by itself indicate better or worse water quality.

Data Sources

Drinking-water compliance data from the EPA Safe Drinking Water Information System (SDWIS) via the ECHO enforcement database. The WaterByCounty SDWIS Compliance Index reflects the recorded rate and is not an EPA score.

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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