Pleasant Lake is a productive, nutrient-rich eutrophic lake in Washtenaw County, Michigan. Water quality is graded D based on 1 sampling years through 2022. Overall water quality is improving over recent sampling years. The lake supports 1 documented fish species including Largemouth bass. Compared to the 16 other monitored lakes in Washtenaw County, Pleasant Lake ranks #14 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2022-09-12. Grade methodology: LakeGrade methodology.
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Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Murky, only visible to about 6.3 ft. Trophic State Index: 51.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.3 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 51 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Pleasant Lake
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Fish Species
Click a species to see every graded lake where it is documented.
Fishing Pleasant Lake
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.67 m/yr | 3 |
| Chlorophyll-a | ↑ Improving | -0.75 µg/L/yr | 3 |
Location
County Ranking
Ranked #14 of 17 lakes in Washtenaw County
Cleaner Lakes Within 30 Miles
Pleasant Lake holds Grade D. 3 nearby lakes hold higher grades.
Nearby Lakes in Washtenaw County
Explore Pleasant Lake across LakeGrade
Fish species and top-graded lakes across Michigan
Fish species and best lakes in Washtenaw County
Species activity outlook by water temperature and season
Where to stay at Michigan's top lakes, each with its grade
High nutrients, frequent algae, reduced clarity
Michigan's cleanest and most-polluted lakes, ranked
More Michigan Lake Rankings
Other Grade D Lakes in Michigan
Livingston County · Clarity: 5.5 ft
Lenawee County · Clarity: 4.5 ft
Shiawassee County · Clarity: 5.5 ft
Shiawassee County · Clarity: 6.5 ft
Oakland County · Clarity: 4.5 ft
Hillsdale County · Clarity: 2.5 ft
Eutrophic Lakes in Michigan
More records, surveys & data sources
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Pleasant Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Bridgewater Twp WwtpSaline · 4.3 mi away · NPDES MI0057118Recent violation
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Data Sources
Water quality data from the EPA Water Quality Portal
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2022-09-12
Monitoring stations: 1