Sunset Lake
Belknap County, New Hampshire253 acresView mapDirections
No nutrient or algae sampling on record from NHDES for this lake.
- Impaired · Mercury
- 60 ft max depth
Sunset Lake in Belknap County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 60 ft. Surface area: 253 acres.
Sunset Lake is a 253-acre lake in Belknap County, New Hampshire with a maximum depth of 60 feet (21-foot average).
Source: EPA Water Quality Portal sampling records, your state environmental agency. Methodology: how these readings are compared.
What Sunset Lake is good for
From access and monitoring records, not editorial picks.
- Deep water60 ft surveyed max depth
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Sunset Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, pH / acidity. Check local advisories before you swim.
Whether Sunset 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 Sunset Lake
These are the measurements NHDES publishes for Sunset 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 Sunset Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
60 ft
Average depth
21.3 ft
Surface area
253 acres
Shoreline
3.8 mi
The depth above comes from a bathymetric survey of this lake, not from a regional estimate.
Stays via Stay22
Stays near Sunset Lake
Compare lakeside cabins, hotels, and vacation rentals near Sunset Lake in Belknap County, New Hampshire — 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 Sunset Lake
Prices for Oct 16–18, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Follow Sunset Lake’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Sunset Lake
EPA Impairment Status
Sunset 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 NHLAK700060401-12 · Official waterbody report
Nearby Lakes in Belknap County
Frequently asked questions about Sunset Lake
Where is Sunset Lake?
- Sunset 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 Sunset Lake?
- Sunset Lake in Belknap County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 60 ft. Surface area: 253 acres.
Is Sunset Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Sunset 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 Sunset Lake?
- Sunset Lake has a maximum depth of 60 feet and an average depth of 21.3 feet. The lake covers 253 acres.
Explore Sunset Lake across LakeQuality
More lakes in New Hampshire
Other Lakes in New Hampshire
Where this data comes from
Measurements for Sunset 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