Nepessing Lake
Nepessing Lake in Lapeer County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 9 ft visibility. Maximum depth: 20 ft. Surface area: 427 acres.
- Clarity
- 9 ft
- Max depth
- 20 ft
- Area
- 427 acres
- Trend
- ↑ Improving
- Public access
- Yes
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Why Nepessing 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 Nepessing 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.
Nepessing Lake is a 427-acre lake in Lapeer County, Michigan with a maximum depth of 20 feet. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2019-09-13. Grade methodology: LakeQuality methodology.
Watch Nepessing Lake water quality
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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 Nepessing Lake
These readings exist but are not enough for an A–F grade — see why.
Moderate clarity, visible to about 9 ft. Trophic State Index: 45.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 9 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 45 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Nepessing Lake
Compare lakeside cabins, hotels, and vacation rentals near Nepessing Lake in Lapeer 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 Nepessing Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 20 ft |
| Surface Area | 427 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Lake NepessingPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Nepessing Lake
Water Quality Trend: ↑ Improving
Based on 8 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.416 m/yr | 8 |
| Phosphorus | ↑ Improving | -1.03 µg/L/yr | 7 |
| Chlorophyll-a | ↓ Declining | +0.34 µg/L/yr | 7 |
EPA Impairment Status
Nepessing Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MI040802040104-03 · Official waterbody report
Graded lakes near Nepessing Lake
Nepessing Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Lapeer County
Frequently asked questions about Nepessing Lake
Where is Nepessing Lake?
- Nepessing Lake is a lake in Lapeer 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 Nepessing Lake?
- Nepessing Lake in Lapeer County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 9 ft visibility. Maximum depth: 20 ft. Surface area: 427 acres.
Is Nepessing Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Nepessing Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
How deep is Nepessing Lake?
- Nepessing Lake has a maximum depth of 20 feet. The lake covers 427 acres.
Are there boat ramps on Nepessing Lake?
- Nepessing Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Lake Nepessing. Public access is listed as yes.
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Where this data comes from
26 measurements from 1 monitoring station, 2016–2019. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- North American Lake Management Society
NALMS26 samples · 2016–2019
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory