Tan Lake
Tan Lake in Oakland County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 11 ft visibility. Surface area: 35.9 acres.
- Clarity
- 11 ft
- Area
- 36 acres
- Trend
- ↑ Improving
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Why Tan Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Tan Lake, the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. Sampling here has recorded water clarity, but not phosphorus and algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by EGLE and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Tan Lake is a 36-acre lake in Oakland County, Michigan. Overall water quality is improving over recent sampling years. The lake supports 2 documented fish species including Brook silverside and Yellow bullhead.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2018-09-11. Grade methodology: LakeQuality methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Tan Lake
These readings exist but are not enough for an A–F grade — see why.
Good clarity, visible to about 11 ft. Trophic State Index: 43.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 11 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 43 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Tan Lake
Compare lakeside cabins, hotels, and vacation rentals near Tan Lake in Oakland County, Michigan — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Tan Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 36 acres |
No bathymetric survey has been published for Tan Lake, so its depth is not documented here.
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Tan Lake
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.59 m/yr | 2 |
| Phosphorus | ↑ Improving | -1 µg/L/yr | 2 |
Nearby Lakes in Oakland County
Frequently asked questions about Tan Lake
Where is Tan Lake?
- Tan Lake is a lake in Oakland County, Michigan. LakeQuality has not rated this lake (UNRATED) — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity.
What is the water quality grade for Tan Lake?
- Tan Lake in Oakland County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 11 ft visibility. Surface area: 35.9 acres.
Is Tan Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Tan Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
What fish are in Tan Lake?
- Fish species found in Tan Lake include Brook silverside, Yellow bullhead. Tan Lake is located in Oakland County, Michigan.
Explore Tan Lake across LakeQuality
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Where this data comes from
18 measurements from 1 monitoring station, 2018. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- North American Lake Management Society
NALMS18 samples · 2018
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.