Sargent Lake
Belknap County, New Hampshire43 acresView mapDirections
No nutrient or algae sampling on record from NHDES for this lake.
- Impaired · Mercury
- 5 ft max depth
Sargent Lake in Belknap County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 5 ft. Surface area: 43 acres.
Sargent Lake is a 43-acre lake in Belknap County, New Hampshire with a maximum depth of 5 feet.
Source: EPA Water Quality Portal sampling records, your state environmental agency. Methodology: how these readings are compared.
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Sargent Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, pH / acidity. Check local advisories before you swim.
Whether Sargent Lake is safe to swim in today is a call for the New Hampshire Department of Environmental Services and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Sargent Lake
These are the measurements NHDES publishes for Sargent 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 Sargent Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
5 ft
Surface area
43 acres
Shoreline
1.5 mi
The depth above comes from a bathymetric survey of this lake, not from a regional estimate.
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Fishing Sargent Lake
EPA Impairment Status
Sargent 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, Fish consumption.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NHLAK700020202-04 · Official waterbody report
Nearby Lakes in Belknap County
Frequently asked questions about Sargent Lake
Where is Sargent Lake?
- Sargent Lake is a lake in Belknap County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.
What is the water quality of Sargent Lake?
- Sargent Lake in Belknap County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 5 ft. Surface area: 43 acres.
Is Sargent Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Sargent Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, pH / acidity. Check local advisories before you swim.
How deep is Sargent Lake?
- Sargent Lake has a maximum depth of 5 feet. The lake covers 43 acres.
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Where this data comes from
Measurements for Sargent 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