Nepessing Lake
Lapeer County, Michigan427 acresView mapDirections
EGLE publishes the water-quality measurements for Nepessing Lake. Here is what has been measured.
- Impaired · Mercury
- 20 ft max depth
- Public access
- Limited data
Nepessing Lake in Lapeer County, Michigan has water-quality measurements published by EGLE, shown here as reported. Water clarity: 9 ft visibility. Maximum depth: 20 ft. Surface area: 427 acres.
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. Methodology: how these readings are compared.
What Nepessing Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Nepessing Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Whether Nepessing Lake is safe to swim in today is a call for the Michigan Department of Environment, Great Lakes, and Energy (EGLE) and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Nepessing Lake
These are the measurements EGLE publishes for Nepessing Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Moderate clarity, visible to about 9 ft. TSI 45.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 9ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 45 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Nepessing Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
20 ft
Surface area
427 acres
Public access
Yes
Listed by EGLE
Recreation & Access
- Lake NepessingPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
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Stays near Nepessing Lake
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Fishing Nepessing Lake
Water Quality Trend: Improving
Based on 8 years of monitoring (2016–2023).
Water clarity
Improving8 years
Phosphorus
Improving-1.03 µg/L/yr7 years
Chlorophyll-a
Worsening+0.34 µg/L/yr7 years
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
Designated uses not supporting: Fish consumption.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MI040802040104-03 · Official waterbody report
Nearby Lakes in Lapeer County
Frequently asked questions about Nepessing Lake
Where is Nepessing Lake?
- Nepessing Lake is a lake in Lapeer County, Michigan. Its water-quality measurements are published by EGLE and shown on this page as reported.
What is the water quality of Nepessing Lake?
- Nepessing Lake in Lapeer County, Michigan has water-quality measurements published by EGLE, shown here as reported. Water clarity: 9 ft visibility. Maximum depth: 20 ft. Surface area: 427 acres.
Is Nepessing Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Nepessing Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
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.
Can I fish at Nepessing Lake?
- Nepessing Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Michigan's fish and wildlife agency, so check its current regulations before you go.
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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)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Named boat-access points from the USGS National Boat Ramps inventory