waterbycounty
Compiled federal source snapshot

Vermont Water Quality

Drinking water data for all 14 counties.

Avg SDWIS Compliance Index

44.6

Most Common Five-Year SDWIS Compliance Band

D

Counties with Data

14

of 14 total

County water atlas

Vermont 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

14

Avg SDWIS index

44.6

Watersheds

0

ATTAINS counties

Monitoring

14

12 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 Vermont

Beyond Drinking Water

EPA SDWIS

14/ 14

counties with drinking-water compliance data

103 health violations statewide (5yr)

EPA ATTAINS

—

No §303(d) assessments yet for Vermont

EPA WQP

1,533

monitoring sites across 14 counties

180,365 total readings (5yr window)

USGS NWIS

12

counties with a fresh pipeline snapshot

0 above12 below

State atlas notes

What stands out in Vermont

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

Addison County has the highest value in the published state SDWIS Compliance Index table at 86.2/100, while Washington County has the lowest at 16.0/100. That is a 70.2 point gap inside one state.

Zero health violations

2

3+ health violations

10

Monitoring hubs

Orleans County195 sitesWindham County185 sitesChittenden County157 sites

Lowest flow reads

Essex County12%Franklin County12%Washington County21%

Highest fresh streamflow pipeline snapshots: Addison County (63%, observation 2026), Bennington County (59%, observation 2026), Rutland County (48%, observation 2026). These are source-data observations, not household tap-water conclusions.

All Vermont Counties

CountySDWIS Compliance Index
Addison County86.2
Essex County86.2
Chittenden County65.6
Bennington County49.7
Grand Isle County44.6
Orleans County43.5
Franklin County40.9
Windsor County38.5
Orange County38.4
Lamoille County32.9
Rutland County31.6
Windham County27.0
Caledonia County23.8
Washington County16.0

Frequently Asked Questions

Which Vermont county has the highest SDWIS Compliance Index?
Addison County has the highest SDWIS Compliance Index in the published Vermont 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 Vermont?
WaterByCounty has 12 fresh USGS pipeline snapshots in the published Vermont 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 Vermont 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 Vermont?
The published county records contain 180,365 results from 1,533 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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