States › Vermont › Grand Isle County

Grand Isle County, VT Water Quality

Water quality data for 4 public water systems serving Grand Isle County, Vermont — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 4 water systems · 4 cities
✅
Excellent — All Systems Performing Well

Water quality across the county is outstanding with minimal violations and very low lead levels.

A

Grand Isle County Earns a A

Grand Isle County: 4 communities across 4 water systems. 100.0% have no open violations.

  • Median lead where detected: 2.80 ppb
  • 3 communities with a lead detection, 1 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 0 with significant inspection deficiencies
  • 100.0% of communities have no open violations
2.8 ppb
Median Lead Level
County-wide, 90th percentile
4
Water Systems
Active CWS & NTNCWS
100%
Violation-Free
No active violations on record
How we grade counties: MyWaterIQ uses EPA SDWIS enforcement data — actual MCL violations and lead test results — not the aspirational MCLG targets used by some sites. A grade reflects real compliance history, not theoretical risk. Learn more →

Cities by Water Quality

⭐ Best Performing
  • Grand Isle
    2.80 ppb
    No federal limits exceeded on record
    B
  • North Hero
    Not detected
    No federal limits exceeded on record
    B
  • Alburgh
    2.20 ppb
    No federal limits exceeded on record
    B
  • South Hero
    3.40 ppb
    8 health-based violations since 2015
    B
⚠ Needs Attention
  • South Hero
    3.40 ppb
    8 health-based violations since 2015
    B
  • Grand Isle
    2.80 ppb
    No federal limits exceeded on record
    B
  • North Hero
    Not detected
    No federal limits exceeded on record
    B
  • Alburgh
    2.20 ppb
    No federal limits exceeded on record
    B
County Lead Level — Median 2.8 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 2.8 ppb — 18.7% of the federal action level
Systems by Lead Level
Under 5 ppb
3
No Data
1

All Cities in Grand Isle County

Grand Isle 2.80 ppb B
South Hero 3.40 ppb B
North Hero Not detected B
Alburgh 2.20 ppb B
Showing 4 cities
No active violations Active violations

About Grand Isle County Drinking Water

Grand Isle County is served by 4 water systems covering 4 communities. No community here has an open violation on record.

Of the communities reporting lead results, 3 recorded a detection, with a median of 2.80 ppb — 19% of the federal action level. 1 reported none detected, which means below the laboratory limit rather than an absence of lead.

No community here has PFAS above the federal limit on record. State inspectors recorded no significant deficiencies.

Frequently Asked Questions

Is Grand Isle County tap water safe to drink?▼
No community in Grand Isle County has an open violation on record. No community has PFAS above the federal limit on record.
What is the lead level in Grand Isle County?▼
Among communities with a detection the median is 2.80 ppb, 19% of the 15 ppb action level. 1 reported none detected and 0 reported no result.
How many water systems serve Grand Isle County?▼
4 community water systems serve 4 communities here.
← Back to Vermont water quality overview