Sebasticook Lake
Penobscot County, Maine4,541 acresView mapDirections
No nutrient or algae sampling on record from Maine DEP for this lake.
- Impaired · Nutrients (phosphorus, nitrogen)
- 50 ft max depth
Sebasticook Lake in Penobscot County, Maine has water-quality measurements published by Maine DEP, shown here as reported. Maximum depth: 50 ft. Surface area: 4541 acres.
Sebasticook Lake is a 4,541-acre lake in Penobscot County, Maine with a maximum depth of 50 feet (20-foot average).
Source: EPA Water Quality Portal sampling records, your state environmental agency. Methodology: how these readings are compared.
What Sebasticook Lake is good for
From access and monitoring records, not editorial picks.
- Deep water50 ft surveyed max depth
- Big water4,541 acres
Swimming conditions
No readingRecreation use not supported
Nutrient and algae readings are not a swimming clearance. Sebasticook Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen), turbidity. Check local advisories before you swim.
Whether Sebasticook Lake is safe to swim in today is a call for the Maine Department of Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Sebasticook Lake
These are the measurements Maine DEP publishes for Sebasticook Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. TSI undefined.
Ask about Sebasticook Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
50 ft
Average depth
20 ft
Surface area
4,541 acres
Shoreline
27.3 mi
The depth above comes from a bathymetric survey of this lake, not from a regional estimate.
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Fishing Sebasticook Lake
EPA Impairment Status
Sebasticook 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: Aquatic life, Recreation.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit ME0103000308_2264L · Official waterbody report
Nearby Lakes in Penobscot County
Frequently asked questions about Sebasticook Lake
Where is Sebasticook Lake?
- Sebasticook Lake is a lake in Penobscot County, Maine. Its water-quality measurements are published by Maine DEP and shown on this page as reported.
What is the water quality of Sebasticook Lake?
- Sebasticook Lake in Penobscot County, Maine has water-quality measurements published by Maine DEP, shown here as reported. Maximum depth: 50 ft. Surface area: 4541 acres.
Is Sebasticook Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Sebasticook Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen), turbidity. Check local advisories before you swim.
How deep is Sebasticook Lake?
- Sebasticook Lake has a maximum depth of 50 feet and an average depth of 20 feet. The lake covers 4541 acres.
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Where this data comes from
Measurements for Sebasticook Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database