Lake Iroquois is a mesotrophic lake in Chittenden County, Vermont. Water quality is graded B based on 3 sampling years through 2025. Compared to the 7 other monitored lakes in Chittenden County, Lake Iroquois ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, Vermont DNR, last sampled 2025-08-18. Grade methodology: LakeGrade methodology.
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Good clarity, visible to about 11.8 ft. Phosphorus level: 18.2 µg/L. Chlorophyll-a: 8.3 µg/L. Trophic State Index: 46.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 11.8 ft | B |
| Phosphorus | 18.2 µg/L | A |
| Chlorophyll-a (Algae) | 8.3 µg/L | B |
| Trophic State Index (TSI) | 46 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Lake Iroquois
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Fishing Lake Iroquois
Location
County Ranking
Ranked #5 of 8 lakes in Chittenden County
Cleaner Lakes Within 30 Miles
Lake Iroquois holds Grade B. 3 nearby lakes hold higher grades.
- ACedar LakeAddison County · 8.4 mi · Higher grade (B → A)
- AShelburne Bay LakeChittenden County · 8.3 mi · Higher grade (B → A)
- ABurlington Bay LakeChittenden County · 10.8 mi · Higher grade (B → A)
Nearby Lakes in Chittenden County
Explore Lake Iroquois across LakeGrade
More Vermont Lake Rankings
Other Grade B Lakes in Vermont
Mesotrophic Lakes in Vermont
More records, surveys & data sources
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2025-08-18
Monitoring stations: 2