waterbycounty
Compiled federal source snapshot

Tennessee Water Quality

Drinking water data for all 95 counties.

Avg SDWIS Compliance Index

73.1

Most Common Five-Year SDWIS Compliance Band

A

Counties with Data

95

of 95 total

County water atlas

Tennessee 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

95

Avg SDWIS index

73.1

Watersheds

95

ATTAINS counties

Monitoring

95

52 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 Tennessee

Beyond Drinking Water

EPA SDWIS

95/ 95

counties with drinking-water compliance data

158 health violations statewide (5yr)

EPA ATTAINS

60.0%

avg impaired across 95 counties

2,222 of 3,528 assessed bodies impaired

EPA WQP

3,686

monitoring sites across 95 counties

590,499 total readings (5yr window)

USGS NWIS

52

counties with a fresh pipeline snapshot

2 above49 below

State atlas notes

What stands out in Tennessee

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

Anderson County has the highest value in the published state SDWIS Compliance Index table at 86.2/100, while Van Buren County has the lowest at 3.4/100. That is a 82.8 point gap inside one state.

Zero health violations

62

3+ health violations

19

Watershed pressure

The atlas impairment layer points to counties where assessed water bodies are most likely to miss state quality standards. Assessment density varies, so compare the percentage with the number of assessed bodies on the county page.

Crockett County100.0%Dyer County100.0%Hamblen County100.0%

Monitoring hubs

Davidson County130 sitesShelby County122 sitesHamilton County102 sites

Lowest flow reads

Sumner County5%Hardeman County13%Coffee County15%

Highest fresh streamflow pipeline snapshots: Lawrence County (173%, observation 2026), Hamilton County (120%, observation 2026), Blount County (94%, observation 2026). These are source-data observations, not household tap-water conclusions.

All Tennessee Counties

CountySDWIS Compliance Index
Anderson County86.2
Benton County86.2
Bradley County86.2
Campbell County86.2
Cannon County86.2
Carroll County86.2
Cheatham County86.2
Chester County86.2
Cocke County86.2
Coffee County86.2
Crockett County86.2
Cumberland County86.2
Davidson County86.2
Decatur County86.2
Dickson County86.2
Dyer County86.2
Fayette County86.2
Franklin County86.2
Gibson County86.2
Grainger County86.2
Hamblen County86.2
Hamilton County86.2
Hancock County86.2
Hardeman County86.2
Haywood County86.2
Henderson County86.2
Henry County86.2
Hickman County86.2
Houston County86.2
Humphreys County86.2
Jefferson County86.2
Johnson County86.2
Knox County86.2
Lauderdale County86.2
Lawrence County86.2
Lewis County86.2
Lincoln County86.2
Loudon County86.2
Macon County86.2
Madison County86.2
Marion County86.2
Marshall County86.2
Maury County86.2
McMinn County86.2
McNairy County86.2
Meigs County86.2
Moore County86.2
Morgan County86.2
Obion County86.2
Overton County86.2
Perry County86.2
Polk County86.2
Putnam County86.2
Scott County86.2
Sequatchie County86.2
Sevier County86.2
Shelby County86.2
Sullivan County86.2
Sumner County86.2
Unicoi County86.2
Weakley County86.2
White County86.2
Rutherford County71.9
Blount County70.7
Washington County70.3
Williamson County68.5
Tipton County67.8
Wilson County67.8
Warren County67.4
Robertson County66.9
Carter County66.5
Monroe County66.1
Hardin County62.3
Claiborne County61.9
Montgomery County61.6
Greene County61.3
Union County57.6
Giles County56.9
Roane County56.3
Bledsoe County50.3
DeKalb County48.9
Hawkins County48.5
Rhea County47.0
Bedford County46.7
Fentress County42.1
Lake County37.3
Smith County26.9
Pickett County24.2
Clay County23.8
Stewart County23.0
Trousdale County21.1
Grundy County20.7
Wayne County19.6
Jackson County10.4
Van Buren County3.4

Frequently Asked Questions

Which Tennessee county has the highest SDWIS Compliance Index?
Anderson County has the highest SDWIS Compliance Index in the published Tennessee 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.
What does EPA ATTAINS report across Tennessee?
Across 95 published Tennessee county records with EPA ATTAINS data, 2,222 of 3,528 assessed water bodies are listed as impaired. This is a watershed assessment and does not describe finished household tap water.
Which USGS streamflow records are shown across Tennessee?
WaterByCounty has 52 fresh USGS pipeline snapshots in the published Tennessee 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 Tennessee 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 Tennessee?
The published county records contain 590,499 results from 3,686 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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