Howlands Lake
Westchester County, New York26 acresView 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
Howlands Lake in Westchester County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 3.1 ft visibility. Surface area: 26 acres.
- Clarity
- 3.1 ft
- Area
- 26 acres
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Watch Howlands Lake’s letter
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Why Howlands Lake has no grade
Howlands 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, Howlands Lake is Not Rated — not an F. Its 3.1-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.
Howlands Lake is a 26-acre lake in Westchester County, New York.
Source: EPA Water Quality Portal sampling records, NYSDEC, last sampled 2020-10-04. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Howlands 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 Howlands Lake
These readings exist but are not enough for an A–F grade — see why.
Very murky, less than 3.1 ft of visibility. TSI 61.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.1 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 61 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 26 acres |
No bathymetric survey has been published for Howlands Lake, so its depth is not documented here.
Fishing Howlands Lake
Reservoir Info (USACE NID)
Howlands Lake is a man-made reservoir impounded by the Howlands Lake Dam (completed 1895), built primarily for recreation on the KISCO RIVER; stone-type dam, 18 ft tall and 67 ft long.
- Surface area
- 26 ac
- Normal storage
- 132 ac-ft
- Max storage
- 184 ac-ft
- Hazard class
- Significant
- Owner
- BEDFORD LAKE PARK ASSOCIATION INC
Source: USACE National Inventory of Dams, NID ID NY00973 · Operator website
EPA Impairment Status
Howlands 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 NY1302-0147 · Official waterbody report
Regulated Pollution Sources Nearby
19 EPA-permitted facilities operate within about 5 miles of Howlands Lake under Clean Water Act (NPDES) discharge permits. 5 facilities have a reported Clean Water Act violation in the past three years.
- Khal Adas KashauBedford Hills · 2.7 mi away · NPDES NY0147249Recent violation
- Fox Hollow Sewer Co. WwtpNew Castle · 3.1 mi away · NPDES NY0165425Recent violation
- Bedford (T) Highway DeptBedford Hills · 3.2 mi away · NPDES NY0264229Recent violation
- Bedford Hills / Katohah Business SdBedford Hills · 3.6 mi away · NPDES NY0101885Recent violation
- Lewisboro Elementary SchoolSouth Salem · 3.8 mi away · NPDES NY0036684Recent violation
- Byram Lake Filtration PlantMt. Kisco · 1.3 mi away · NPDES NY0264113
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 Westchester County
Frequently asked questions about Howlands Lake
Where is Howlands Lake?
- Howlands Lake is a lake in Westchester 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 Howlands Lake?
- Howlands Lake in Westchester County, New York is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 3.1 ft visibility. Surface area: 26 acres.
Is Howlands Lake safe to swim in?
- The letter is not a swimming clearance. Howlands 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)