Lake Katonah
Westchester County, New York25 acresView mapDirections
No nutrient or algae sampling on record from NY DEC for this lake.
- Impaired · Nutrients (phosphorus, nitrogen)
- 6 ft max depth
Lake Katonah in Westchester County, New York has water-quality measurements published by NY DEC, shown here as reported. Maximum depth: 5.6 ft. Surface area: 25 acres.
Lake Katonah is a 25-acre lake in Westchester County, New York with a maximum depth of 6 feet (3-foot average).
Source: EPA Water Quality Portal sampling records, NYSDEC. Methodology: how these readings are compared.
Swimming conditions
No readingRecreation use not supported
Nutrient and algae readings are not a swimming clearance. Lake Katonah is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Whether Lake Katonah is safe to swim in today is a call for the New York Department of Environmental Conservation and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Lake Katonah
These are the measurements NY DEC publishes for Lake Katonah, 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 Lake Katonah
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
5.6 ft
Average depth
2.6 ft
Surface area
25 acres
Shoreline
1.1 mi
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Fishing Lake Katonah
EPA Impairment Status
Lake Katonah is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Recreation.
Source: EPA ATTAINS assessment unit NY1302-0136 · Official waterbody report
Nearby Lakes in Westchester County
Frequently asked questions about Lake Katonah
Where is Lake Katonah?
- Lake Katonah is a lake in Westchester County, New York. Its water-quality measurements are published by NY DEC and shown on this page as reported.
What is the water quality of Lake Katonah?
- Lake Katonah in Westchester County, New York has water-quality measurements published by NY DEC, shown here as reported. Maximum depth: 5.6 ft. Surface area: 25 acres.
Is Lake Katonah safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Lake Katonah is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
How deep is Lake Katonah?
- Lake Katonah has a maximum depth of 5.6 feet and an average depth of 2.6 feet. The lake covers 25 acres.
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Where this data comes from
Measurements for Lake Katonah 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