Northdeep Lake
Northdeep Lake in Chautauqua County, New York is not rated for water quality — its monitoring record does not meet the evidence bar.
Next lake in Chautauqua County
Why Northdeep Lake has no grade
We grade a lake only when its monitoring record clears the evidence bar: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Northdeep Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by NYSDEC and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Northdeep Lake is a lake in Chautauqua County, New York.
Source: EPA Water Quality Portal sampling records, NYSDEC, last sampled 2025-05-08. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Northdeep Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
No clarity data.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples |
Where to stay near Northdeep Lake
Compare lakeside cabins, hotels, and vacation rentals near Northdeep Lake in Chautauqua County, New York — 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 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
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NY0202-0072 · Official waterbody report · Matched by proximity (1.37 km)
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
What is the water quality grade for Northdeep Lake?
- Northdeep Lake in Chautauqua County, New York is not rated for water quality — its monitoring record does not meet the evidence bar.
Is Northdeep Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Northdeep Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Northdeep Lake across LakeGrade
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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)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)