waterbycounty
Compiled federal source snapshot

West Virginia Water Quality

Drinking water data for all 54 counties.

Avg SDWIS Compliance Index

34.8

Most Common Five-Year SDWIS Compliance Band

F

Counties with Data

54

of 54 total

County water atlas

West Virginia 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

54

Avg SDWIS index

34.8

Watersheds

0

ATTAINS counties

Monitoring

54

38 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 West Virginia

Beyond Drinking Water

EPA SDWIS

54/ 54

counties with drinking-water compliance data

728 health violations statewide (5yr)

EPA ATTAINS

—

No §303(d) assessments yet for West Virginia

EPA WQP

1,137

monitoring sites across 54 counties

208,490 total readings (5yr window)

USGS NWIS

38

counties with a fresh pipeline snapshot

2 above36 below

State atlas notes

What stands out in West Virginia

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

Cabell County has the highest value in the published state SDWIS Compliance Index table at 86.2/100, while Hardy County has the lowest at 3.5/100. That is a 82.7 point gap inside one state.

Zero health violations

9

3+ health violations

41

Monitoring hubs

Webster County104 sitesHampshire County83 sitesRaleigh County82 sites

Lowest flow reads

Doddridge County6%Wetzel County7%Morgan County10%

Highest fresh streamflow pipeline snapshots: Hancock County (225%, observation 2026), Nicholas County (136%, observation 2026), Fayette County (88%, observation 2026). These are source-data observations, not household tap-water conclusions.

All West Virginia Counties

CountySDWIS Compliance Index
Cabell County86.2
Doddridge County86.2
Gilmer County86.2
Lewis County86.2
Pendleton County86.2
Pleasants County86.2
Putnam County86.2
Upshur County86.2
Wirt County86.2
Kanawha County63.8
Wood County61.6
Berkeley County59.8
Taylor County55.9
Marshall County54.0
Monongalia County53.3
Braxton County50.8
Jackson County40.7
Summers County40.1
Barbour County38.5
Marion County32.3
Monroe County31.6
Preston County31.5
Brooke County28.8
Ohio County28.5
Mason County27.7
Nicholas County26.2
Grant County25.3
Hampshire County24.4
Jefferson County24.3
Harrison County24.1
Hancock County20.6
Mineral County20.3
Roane County20.1
Wayne County18.9
Fayette County18.8
Raleigh County18.5
Logan County17.5
Clay County17.0
Randolph County16.9
Morgan County13.0
Mercer County12.1
Greenbrier County11.9
Ritchie County10.9
Tyler County9.2
Wetzel County8.2
Pocahontas County8.1
Lincoln County7.6
Tucker County6.2
Webster County6.0
Wyoming County4.4
Mingo County4.2
Calhoun County3.6
McDowell County3.6
Hardy County3.5

Frequently Asked Questions

Which West Virginia county has the highest SDWIS Compliance Index?
Cabell County has the highest SDWIS Compliance Index in the published West Virginia 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 West Virginia?
WaterByCounty has 38 fresh USGS pipeline snapshots in the published West Virginia 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 West Virginia 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 West Virginia?
The published county records contain 208,490 results from 1,137 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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