Montgomery Lake
Sullivan County, New YorkView mapDirections
Not Rated: one monitoring station are on record, but they measured water clarity only. LakeQuality’s A–F method grades total phosphorus, total nitrogen, chlorophyll-a, and turbidity; clarity is shown, not scored.
- Impaired · Nutrients (phosphorus, nitrogen)
- Limited data
Montgomery Lake in Sullivan County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 13.9 ft visibility.
- Clarity
- 13.9 ft
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Stays near Montgomery Lake
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Watch Montgomery Lake’s letter
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Why Montgomery Lake has no grade
Montgomery Lake has monitoring on record from one station, but only water clarity was measured. LakeQuality’s A–F letter uses total phosphorus, total nitrogen, chlorophyll-a, and turbidity against EPA National Lakes Assessment condition classes. With none of those grading measurements on record, Montgomery Lake is Not Rated — not an F. Its 13.9-foot median from 8 readings collected 2020 is still shown as clarity, but clarity alone cannot earn a letter.
Not Rated is EPA Integrated Reporting Category 3 — insufficient information. 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.
Montgomery Lake is a lake in Sullivan County, New York.
Source: EPA Water Quality Portal sampling records, NYSDEC, last sampled 2020-09-19. Grade methodology: LakeQuality methodology.
What Montgomery Lake is good for
From access and monitoring records, not editorial picks.
- Clear water13.9 ft of visibility
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Montgomery Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Water quality measurements for Montgomery Lake
These readings exist but are not enough for an A–F grade — see why.
Good clarity, visible to about 13.9 ft. TSI 39.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 13.9 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 39 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Fishing Montgomery Lake
EPA Impairment Status
Montgomery Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit NY1401-0091 · Official waterbody report · Matched by proximity (0.42 km)
Regulated Pollution Sources Nearby
8 EPA-permitted facilities operate within about 5 miles of Montgomery Lake under Clean Water Act (NPDES) discharge permits. 3 facilities have a reported Clean Water Act violation in the past three years.
- Eldred PreserveEldred · 4 mi away · NPDES NY0281239Recent violation
- Aqua Pa Wastewater Inc Mast Hope WwtfLackawaxen · 4.7 mi away · NPDES PA0060496Recent violation
- 696 State Highway Route 580 Sftf (Fka David Holbert Sftf)Lackawaxen · 4.8 mi away · NPDES PA0065129Recent violation
- Barryville Shop - County DpwBarryville · 1.9 mi away · NPDES NY0264202
- Rudd HouseBarryville · 2.1 mi away · NPDES NY0219274
- New Hope Manor IncBarryville · 3.3 mi away · NPDES NY0207586
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 Sullivan County
Frequently asked questions about Montgomery Lake
Where is Montgomery Lake?
- Montgomery Lake is a lake in Sullivan County, New York. LakeQuality has not rated this lake (UNRATED) — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity.
What is the water quality grade for Montgomery Lake?
- Montgomery Lake in Sullivan County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 13.9 ft visibility.
Is Montgomery Lake safe to swim in?
- The letter is not a swimming clearance. Montgomery Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
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Where this data comes from
8 measurements from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North American Lake Management Society
NALMS8 samples · 2020
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)