Loon Pond
Hillsborough County, New Hampshire154 acresView mapDirections
No nutrient or algae sampling on record from NHDES for this lake.
- Impaired · Mercury
- 23 ft max depth
Loon Pond in Hillsborough County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 23 ft. Surface area: 154 acres.
Loon Pond is a 154-acre lake in Hillsborough County, New Hampshire with a maximum depth of 23 feet (12-foot average).
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. Loon Pond is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, pH / acidity. Check local advisories before you swim.
Whether Loon Pond 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 Loon Pond
These are the measurements NHDES publishes for Loon Pond, 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 Loon Pond
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
23 ft
Average depth
11.8 ft
Surface area
154 acres
Shoreline
2.9 mi
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Fishing Loon Pond
EPA Impairment Status
Loon Pond 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 NHLAK700030204-04 · Official waterbody report
Nearby Lakes in Hillsborough County
Frequently asked questions about Loon Pond
Where is Loon Pond?
- Loon Pond is a lake in Hillsborough County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.
What is the water quality of Loon Pond?
- Loon Pond in Hillsborough County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 23 ft. Surface area: 154 acres.
Is Loon Pond safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Loon Pond is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, pH / acidity. Check local advisories before you swim.
How deep is Loon Pond?
- Loon Pond has a maximum depth of 23 feet and an average depth of 11.8 feet. The lake covers 154 acres.
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Where this data comes from
Measurements for Loon Pond 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