Oakland County, Michigan · Water Quality Report Card
Cedar Is Lake East Central Basin
Cedar Is Lake East Central Basin in Oakland County, Michigan has a water quality grade of B (Good). Water clarity: 11 ft visibility. Phosphorus: 16 µg/L.
- Clarity
- 11 ft
- Type
- Mesotrophic
- Trend
- ↑ Improving
Cedar Is Lake East Central Basin is a mesotrophic lake in Oakland County, Michigan. Water quality is graded B based on 1 sampling years through 2023. Overall water quality is improving over recent sampling years. Compared to the 15 other monitored lakes in Oakland County, Cedar Is Lake East Central Basin ranks #11 for water quality.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2023-09-22. 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 ft. Phosphorus level: 16 µg/L. Trophic State Index: 43.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 11 ft | |
| Phosphorus | 16 µg/L | Good |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 43 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Cedar Is Lake East Central Basin
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Fishing Cedar Is Lake East Central Basin
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +2.26 m/yr | 3 |
| Phosphorus | ↑ Improving | -2.25 µg/L/yr | 3 |
| Chlorophyll-a | ↑ Improving | -0.2 µg/L/yr | 3 |
Location
County Ranking
Ranked #11 of 16 lakes in Oakland County
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Moderate nutrients, good water quality
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Other Grade B Lakes in Michigan
Livingston County · 10.5 ft
Livingston County · 7 ft
Livingston County · 10.5 ft
Washtenaw County · 13 ft
Washtenaw County · 11 ft
Lapeer County · 7 ft
Mesotrophic Lakes in Michigan
More records, surveys & data sources
EPA Impairment Status
Cedar Is Lake East Central Basin 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 MI040900050102-11 · Official waterbody report · Matched by proximity (2.67 km)
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Where this data comes from
29 measurements from 1 monitoring station, 2021–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Michigan EGLE - MiCorps
21MICH_MICORPS29 samples · 2021–2023
Analytical methods
- Phosphorus by Colorimetry
Monitoring station identifiers (1)
Grade thresholds come from the U.S. EPA National Lakes Assessment 2022 Technical Support Document (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated.
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Most recent sample: 2023-09-22
Monitoring stations: 1