Adder Pond
Merrimack County, New Hampshire27 acresView mapDirections
No nutrient or algae sampling on record from NHDES for this lake.
- Impaired · Algal growth
- 15 ft max depth
Adder Pond in Merrimack County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 15 ft. Surface area: 27 acres.
Adder Pond is a 27-acre lake in Merrimack County, New Hampshire with a maximum depth of 15 feet.
Source: EPA Water Quality Portal sampling records, your state environmental agency. Methodology: how these readings are compared.
Swimming conditions
No readingBacteria advisory
Nutrient and algae readings are not a swimming clearance. Adder Pond is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, biotoxins, mercury, nutrients (phosphorus, nitrogen), oxygen depletion (low DO), pH / acidity. Check local advisories before you swim.
Whether Adder 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 Adder Pond
These are the measurements NHDES publishes for Adder 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 Adder Pond
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
15 ft
Surface area
27 acres
Shoreline
0.8 mi
The depth above comes from a bathymetric survey of this lake, not from a regional estimate.
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Fishing Adder Pond
EPA Impairment Status
Adder Pond is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Aquatic life, Fish consumption, Recreation.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NHLAK700030403-01 · Official waterbody report
Nearby Lakes in Merrimack County
Frequently asked questions about Adder Pond
Where is Adder Pond?
- Adder Pond is a lake in Merrimack County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.
What is the water quality of Adder Pond?
- Adder Pond in Merrimack County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 15 ft. Surface area: 27 acres.
Is Adder Pond safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Adder Pond is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, biotoxins, mercury, nutrients (phosphorus, nitrogen), oxygen depletion (low DO), pH / acidity. Check local advisories before you swim.
How deep is Adder Pond?
- Adder Pond has a maximum depth of 15 feet. The lake covers 27 acres.
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Where this data comes from
Measurements for Adder 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