Where is Lake Tappan?

Lake Tappan is a lake in Bergen County, New Jersey. Its water-quality measurements are published by NJDEP and shown on this page as reported.

Lake Tappan

Bergen County, New Jersey920 acresView map Directions

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

Area

920 acres

Surface area

Shoreline

10.4 mi

Measured length

Impaired · Impaired biota (cause unknown)

See the measurements Directions Where to stay

Lake Tappan in Bergen County, New Jersey has water-quality measurements published by NJDEP, shown here as reported. Surface area: 920 acres.

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Lake Tappan is a 920-acre lake in Bergen County, New Jersey.

Source: EPA Water Quality Portal sampling records, your state environmental agency. Methodology: how these readings are compared.

Swimming conditions

No reading

Bacteria advisory

Nutrient and algae readings are not a swimming clearance. Lake Tappan is listed impaired under Clean Water Act §303(d) (IR 5) for impaired biota (cause unknown), mercury, metals (other than mercury), pathogens (E. coli, fecal). Check local advisories before you swim.

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

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Water quality measurements for Lake Tappan

These are the measurements NJDEP publishes for Lake Tappan, 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.

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

Lake Details

Surface area

920 acres

Shoreline

10.4 mi

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

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Stays near Lake Tappan

Compare lakeside cabins, hotels, and vacation rentals near Lake Tappan in Bergen County, New Jersey — 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.

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Fishing Lake Tappan

→ Lake Tappan fishing regulations (limits, seasons, special rules)

EPA Impairment Status

Lake Tappan is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).

Causes of impairment

Impaired biota (cause unknown)MercuryMetals (other than mercury)Pathogens (E. coli, fecal)

Designated uses not supporting: Drinking water, Aquatic life, Fish consumption, Recreation.

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

Source: EPA ATTAINS assessment unit NJ02030103170030-01 · Official waterbody report

Nearby Lakes in Bergen County

Woodcliff Lake2.7 miView →Oradell Reservoir4.1 miView →Schlegel Lake4.6 miView →Green Brook Pond4.4 ft clear · Eutrophic—View →Dators Pond—View →Haledon Reservoir—View →

Frequently asked questions about Lake Tappan

Where is Lake Tappan?: Lake Tappan is a lake in Bergen County, New Jersey. Its water-quality measurements are published by NJDEP and shown on this page as reported.
What is the water quality of Lake Tappan?: Lake Tappan in Bergen County, New Jersey has water-quality measurements published by NJDEP, shown here as reported. Surface area: 920 acres.
Is Lake Tappan safe to swim in?: Nutrient and algae readings are not a swimming clearance. Lake Tappan is listed impaired under Clean Water Act §303(d) (IR 5) for impaired biota (cause unknown), mercury, metals (other than mercury), pathogens (E. coli, fecal). Check local advisories before you swim.