Long Pond is a lake in Barnstable County, Massachusetts. Its water-quality measurements are published by MassDEP and shown on this page as reported.

Long Pond

Barnstable County, Massachusetts34 acresView map Directions

No nutrient or algae sampling on record from MassDEP for this lake.

Area

34 acres

Surface area

Shoreline

1.4 mi

Measured length

Impaired · Mercury

See the measurements Directions Where to stay

Long Pond in Barnstable County, Massachusetts has water-quality measurements published by MassDEP, shown here as reported. Surface area: 34 acres.

Loading map…

Long Pond is a 34-acre lake in Barnstable County, Massachusetts.

Source: EPA Water Quality Portal sampling records, MassDEP. Methodology: how these readings are compared.

Swimming conditions

No reading

Not rated

Nutrient and algae readings are not a swimming clearance. Long Pond is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.

Whether Long Pond is safe to swim in today is a call for the Massachusetts Department of Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

Get alerts for Long Pond →

Water quality measurements for Long Pond

These are the measurements MassDEP publishes for Long 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 Long Pond

Answers come straight from the public measurements and survey records on this page.

Lake Details

Surface area

34 acres

Shoreline

1.4 mi

No bathymetric survey has been published for Long Pond, so its depth is not documented here.

Stays via Stay22

Stays near Long Pond

Compare lakeside cabins, hotels, and vacation rentals near Long Pond in Barnstable County, Massachusetts — 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 Long Pond

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.

Planning a whole trip? See where to stay at Massachusetts’s top lakes →

Follow Long Pond’s readings

Email me when new measurements post for this lake. Updates stay free.

Or email

Fishing Long Pond

→ Long Pond fishing regulations (limits, seasons, special rules)

EPA Impairment Status

Long Pond is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4A).

Causes of impairment

Mercury

Designated uses not supporting: Fish consumption.

A Total Maximum Daily Load (TMDL) plan has been approved.

Source: EPA ATTAINS assessment unit MA96179 · Official waterbody report

Nearby Lakes in Barnstable County

Great Pond0.4 miView →Gull Pond0.8 miView →Higgins Pond1.2 miView →Williams PondEutrophic1.3 miView →Slough Pond1.6 miView →Great Pond7.7 miView →

Frequently asked questions about Long Pond

Where is Long Pond?: Long Pond is a lake in Barnstable County, Massachusetts. Its water-quality measurements are published by MassDEP and shown on this page as reported.
What is the water quality of Long Pond?: Long Pond in Barnstable County, Massachusetts has water-quality measurements published by MassDEP, shown here as reported. Surface area: 34 acres.
Is Long Pond safe to swim in?: Nutrient and algae readings are not a swimming clearance. Long Pond is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.