waterbycounty
Compiled federal source snapshot

Kansas Water Quality

Drinking water data for all 57 counties.

Avg SDWIS Compliance Index

47.3

Most Common Five-Year SDWIS Compliance Band

F

Counties with Data

57

of 57 total

County water atlas

Kansas 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

57

Avg SDWIS index

47.3

Watersheds

0

ATTAINS counties

Monitoring

57

43 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 Kansas

Beyond Drinking Water

EPA SDWIS

57/ 57

counties with drinking-water compliance data

351 health violations statewide (5yr)

EPA ATTAINS

—

No §303(d) assessments yet for Kansas

EPA WQP

271

monitoring sites across 57 counties

122,663 total readings (5yr window)

USGS NWIS

43

counties with a fresh pipeline snapshot

3 above38 below

State atlas notes

What stands out in Kansas

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

Atchison County has the highest value in the published state SDWIS Compliance Index table at 86.2/100, while Jewell County has the lowest at 0.8/100. That is a 85.4 point gap inside one state.

Zero health violations

19

3+ health violations

31

Monitoring hubs

Johnson County30 sitesJackson County25 sitesClay County22 sites

Lowest flow reads

Cheyenne County0%Finney County0%Harvey County0%

Highest fresh streamflow pipeline snapshots: Shawnee County (162%, observation 2026), Douglas County (148%, observation 2026), Jefferson County (135%, observation 2026). These are source-data observations, not household tap-water conclusions.

All Kansas Counties

CountySDWIS Compliance Index
Atchison County86.2
Cheyenne County86.2
Clay County86.2
Cloud County86.2
Coffey County86.2
Douglas County86.2
Grant County86.2
Hamilton County86.2
Harvey County86.2
Jackson County86.2
Kiowa County86.2
Leavenworth County86.2
Morton County86.2
Scott County86.2
Sedgwick County86.2
Trego County86.2
Wallace County86.2
Wichita County86.2
Wyandotte County86.2
Johnson County71.5
Riley County66.9
Neosho County56.2
Lyon County54.7
Finney County50.3
Shawnee County49.7
Geary County48.7
Nemaha County48.5
Jefferson County43.4
Crawford County40.5
Miami County37.8
Osage County36.8
Kingman County36.3
Bourbon County35.4
Russell County32.7
Franklin County32.5
Washington County27.3
Cherokee County27.1
Labette County24.2
Pottawatomie County23.7
Montgomery County23.2
Brown County21.1
Marshall County19.7
Sumner County19.5
Linn County19.1
Marion County15.3
Dickinson County14.2
Smith County12.4
Stafford County12.1
Doniphan County11.6
Reno County10.7
Wabaunsee County9.9
Wilson County8.6
Chase County5.6
Republic County4.1
Gray County3.8
Osborne County3.3
Jewell County0.8

Frequently Asked Questions

Which Kansas county has the highest SDWIS Compliance Index?
Atchison County has the highest SDWIS Compliance Index in the published Kansas 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 Kansas?
WaterByCounty has 43 fresh USGS pipeline snapshots in the published Kansas 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 Kansas 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 Kansas?
The published county records contain 122,663 results from 271 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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