Vandalia Lake
Fayette County, WisconsinHypereutrophic
Vandalia Lake is a highly nutrient-loaded hypereutrophic lake in Fayette County, IL. Water quality is graded F based on 2 sampling years through 2022.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2022-10-27. Grade methodology: LakeGrade methodology.
Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
Very murky, less than 1.3 ft of visibility. Phosphorus level: 93 µg/L. Trophic State Index: 72.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.3 ft | F |
| Phosphorus | 93 µg/L | F |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 72 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Location
County Ranking
Ranked #1 of 1 lakes in Fayette County
Cleaner Lakes Within 30 Miles
Vandalia Lake holds Grade F. 2 nearby lakes hold higher grades.
- DKinmundy New LakeMarion County · 22.1 mi · Higher grade (F → D)
- DSara LakeEffingham County · 28.2 mi · Higher grade (F → D)
Nearby Lakes in Fayette County
More Wisconsin Lake Rankings
Other Grade F Lakes in Wisconsin
Hypereutrophic Lakes in Wisconsin
EPA Impairment Status
Vandalia Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit IL_ROD · Official waterbody report
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Grading methodology based on Metropolitan Council standards
Most recent sample: 2022-10-27
Monitoring stations: 3