Northdeep Lake
Chautauqua County, New YorkView mapDirections
No nutrient or algae sampling on record from NY DEC for this lake.
- Impaired · Nutrients (phosphorus, nitrogen)
- Limited data
Northdeep Lake in Chautauqua County, New York has water-quality measurements published by NY DEC, shown here as reported.
Northdeep Lake is a lake in Chautauqua County, New York.
Source: EPA Water Quality Portal sampling records, NYSDEC, last sampled 2025-05-08. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Northdeep Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Whether Northdeep Lake 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 Northdeep Lake
These are the measurements NY DEC publishes for Northdeep Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data.
Ask about Northdeep Lake
Answers come straight from the public measurements and survey records on this page.
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Stays near Northdeep Lake
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Fishing Northdeep Lake
EPA Impairment Status
Northdeep Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4A).
Causes of impairment
Designated uses not supporting: Aquatic life.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NY0202-0072 · Official waterbody report
Regulated Pollution Sources Nearby
2 EPA-permitted facilities operate within about 5 miles of Northdeep Lake under Clean Water Act (NPDES) discharge permits.
- Bayberry Landing Condo AssociationChautauqua, Town Of · 0.7 mi away · NPDES NY0060348
- Chautauqua Heights, Inc. - Koa CampgroundTown Of Dewittville · 1 mi away · NPDES NY0128163
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Nearby Lakes in Chautauqua County
Frequently asked questions about Northdeep Lake
Where is Northdeep Lake?
- Northdeep Lake is a lake in Chautauqua 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 Northdeep Lake?
- Northdeep Lake in Chautauqua County, New York has water-quality measurements published by NY DEC, shown here as reported.
Is Northdeep Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Northdeep Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
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Where this data comes from
979 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Rensselaer Polytechnic Institute
RPI979 samples · 2020–2025
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)