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County water report

Grand Isle County Water Report

Drinking-water compliance, watershed health, monitoring records, and river conditions for Grand Isle County, Vermont.

Water grade

C

Water score

51.8

State rank

#4

of 14

Health violations

1

EPA SDWIS, 5-year lookback

Watershed impaired

Not reported

EPA ATTAINS coverage varies by state

Monitoring sites

8

469 recent measurements

Live streamflow

No gauge

Primary USGS station not mapped

Water at a glance

Key Water Indicators for Grand Isle County

EPA SDWIS

Safety Grade

C

Score: 51.8 / 100

EPA SDWIS

Active Violations

1

5-year health-based lookback

EPA ATTAINS

Watershed Health

Not reported

Coverage varies by state

USGS NWIS

Streamflow Snapshot

No gauge

Primary USGS gauge not mapped

EPA WQP

Monitoring Sites

8

469 recent readings

Source: EPA SDWIS · Safe Drinking Water Information System

Drinking Water Compliance

Compliance grade

C

Based on EPA SDWIS compliance history.

Water score

Higher scores indicate cleaner recent compliance records.

51.8/100

Health violations

1

Health-based violations

Violations per 100K served

14.0

Population-normalized SDWIS rate

Editorial analysis

Understanding Grand Isle County’s Water

Drinking Water Quality Overview

EPA SDWIS

Grand Isle County's drinking water earned a C grade, scoring 51.8 out of 100. Over the past five years, EPA SDWIS records 1 health-based violation — a single incident worth monitoring.

Monitoring Network

EPA WQP

EPA's Water Quality Portal (WQP) aggregates monitoring data from federal, state, and tribal agencies. Grand Isle County has limited coverage with 8 active monitoring sites with 469 recent measurements on record. Predominant monitoring categories include nutrient and biological, algae, phytoplankton. More monitoring sites generally indicate greater scientific attention to local water conditions — and provide the baseline data that regulators use to set future impairment listings.

Editorial advisory

What the data suggests for Grand Isle County

Water Verdict

Grand Isle County receives a below-average water quality assessment with a grade of C and a score of 51.8 out of 100. Residents should review their utility's Consumer Confidence Report and may want to consider additional water filtration for drinking.

Violation Context

Grand Isle County has recorded 1 health-based violation, meaning the water system experienced at least one exceedance of federal contaminant limits or treatment requirements. At 14.0 violations per 100,000 people served, this rate is high and signals significant water quality management issues.

Consumer Guidance

Tap water in Grand Isle County meets baseline standards but the compliance record shows room for improvement, with a Grade C rating. Grand Isle County's drinking-water compliance score is 51.8 out of 100. The violation rate for Grand Isle County is 14.0 per 100,000 people served. Residents who are immunocompromised, pregnant, or have young children may benefit from using an NSF 53-certified filter. Contacting your local utility for the current Consumer Confidence Report will confirm which specific violations were recorded and whether they have been resolved. There are 8 active water-quality monitoring sites in Grand Isle County.

Regional Context

Grand Isle County has better water quality than the average county in Vermont. Its water score is 6.2 points higher than the state average, indicating stronger water system performance relative to neighboring counties.

Advisory text summarizes county-level public records and is not a replacement for your utility's current Consumer Confidence Report or direct local notices.

Contaminants & Resources

Key issues flagged in Grand Isle County's water environment

Official EPA Resources for Grand Isle County

EPA How's My Waterway

Interactive watershed health data for Grand Isle County

EPA ECHO: Drinking Water Systems

Search water utilities and violation records for Grand Isle County

Consumer Confidence Reports (VT)

Annual water quality reports from utilities in Vermont

Past 5 years

Water Quality Monitoring

Monitoring Sites

8

Active in the past 5 years

Measurements Recorded

469

469 total readings

Most Measured

  • Nutrient
  • Biological, Algae, Phytoplankton
  • Physical

Categories measured most frequently

Data from the EPA Water Quality Portal (WQP), aggregating monitoring records from federal, state, and tribal sources. Each measurement represents a single sample analyzed for a specific characteristic (e.g., E. coli, pH, dissolved oxygen, nitrogen).

Free tool

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Water Cost Estimate

3

3 people  ·  ~225 gal/day

Annual Total

$558

Monthly

$47

Water Bill

$558/yr

Filter Cost

$0/yr

Safety Grade for Grand Isle County:D — Poor

Elevated violations or significant watershed impairment.

Estimates use the national average residential water rate ($0.0068/gal, EPA/AWWA 2023) and EPA WaterSense per-person consumption baseline (75 gal/person/day). Actual bills vary by utility, usage tier, and local infrastructure fees. For informational purposes only.

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Frequently Asked Questions

What is the water quality in Grand Isle County, Vermont?
Grand Isle County, Vermont has a drinking-water quality grade of C with a score of 51.8/100, based on EPA SDWIS compliance data. The county has 1 health-based drinking water violation over the past 5 years. Watershed health, monitoring records, and streamflow snapshots are reported separately on this page.
Are there any water violations in Grand Isle County?
Grand Isle County has 1 health-based drinking water violation recorded by the EPA over the past 5 years. Health-based violations indicate instances where contaminant levels exceeded EPA Maximum Contaminant Levels (MCLs). Violations may have been resolved — check with your local water utility for current status.
How much water-quality monitoring happens in Grand Isle County?
EPA's Water Quality Portal records 469 measurements from 8 monitoring sites in Grand Isle County over the past five years. The most frequently measured characteristic groups are Nutrient, Biological, Algae, Phytoplankton, Physical. Each measurement is a single sample analyzed for one characteristic (E. coli, pH, dissolved oxygen, etc.). High monitoring density means more scientific evidence behind any reported signal — it does not by itself indicate water quality.
How does Grand Isle County water compare to the Vermont average?
Grand Isle County's SDWIS water quality score of 51.8/100 is higher than the Vermont state average of 45.6. The average water quality grade across Vermont is D, based on data from 14 counties with available SDWIS data.
Is tap water safe to drink in Grand Isle County?
Based on EPA SDWIS data, Grand Isle County has a water quality grade of C (51.8/100). This indicates moderate compliance. Some violations have been recorded but overall standards are maintained. The grade speaks to the public water system, not the watershed — for watershed-level concerns, see the Watershed Health zone. For the most up-to-date information, contact your local water utility or review your Consumer Confidence Report (CCR).
Does Grand Isle County have clean drinking water?
Grand Isle County has 1 health-based drinking water violation according to EPA records. With a water quality score of 51.8/100 and grade C, the county's drinking water has had some compliance issues but continues to be monitored. Note: drinking-water compliance speaks to the public water system, not necessarily to the watershed itself — check the Watershed Health zone for ATTAINS §303(d) data.
How does Grand Isle County rank for water quality in Vermont?
Grand Isle County ranks #4 out of 14 counties in Vermont by SDWIS water quality score (1 = best). With a score of 51.8/100, it falls in the top third of counties statewide. The ranking reflects EPA SDWIS compliance only — not watershed impairment, monitoring density, or streamflow, which are tracked separately on this page.

Counties with Similar Water Quality

Orleans County

Vermont

C

50.9

Water score

Franklin County

Vermont

D

50.0

Water score

Bennington County

Vermont

D

43.6

Water score

Data Sources

Drinking-water compliance data from the EPA Safe Drinking Water Information System (SDWIS) via the ECHO enforcement database. Scores reflect compliance history and health-based violation counts.

Water-quality monitoring counts from the EPA Water Quality Portal (WQP), federated USGS, EPA, and state agency sampling records over a rolling 5-year window.

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.

By Evan Brooks, Data EditorUpdated Reviewed by Evan Brooks, Data Editor

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