Seven Hills Lake is a 56-acre productive, nutrient-rich eutrophic lake in Putnam County, New York. Water quality is graded D based on 1 sampling years through 2020. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 12 other monitored lakes in Putnam County, Seven Hills Lake ranks #12 for water quality.
Source: EPA Water Quality Portal sampling records, New York DNR, last sampled 2020-09-14. Grade methodology: LakeGrade methodology.
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Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Murky, only visible to about 4.8 ft. Trophic State Index: 54.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.8 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 54 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 56 acres |
| Public Access | Yes |
Where to stay near Seven Hills Lake
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Fishing Seven Hills Lake
Recreation & Access
Location
County Ranking
Ranked #12 of 13 lakes in Putnam County
Nearby Lakes in Putnam County
Explore Seven Hills Lake across LakeGrade
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Species activity outlook by water temperature and season
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High nutrients, frequent algae, reduced clarity
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More records, surveys & data sources
Reservoir Info (USACE NID)
Seven Hills Lake is a man-made reservoir impounded by the Seven Hills Realty CO INC Dam (completed 1957), built primarily for recreation on the TR-W BRANCH CROTON RIVER; earth-type dam, 15 ft tall and 345 ft long.
- Surface area
- 56 ac
- Normal storage
- 380 ac-ft
- Max storage
- 570 ac-ft
- Drainage area
- 5.5 sq mi
- Hazard class
- Low
- Owner
- NYCDEP DAMS EAST OF THE HUDSON RIVER;SEVEN HILLS LAKE PROPERTY OWNERS ASSOC.
Source: USACE National Inventory of Dams, NID ID NY01143 · Operator website · Matched by proximity (0.62 km)
EPA Impairment Status
Seven Hills 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 NY1302-0045 · Official waterbody report · Matched by proximity (2.91 km)
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Regulated Pollution Sources Nearby
3 EPA-permitted facilities operate within about 5 miles of Seven Hills Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Package Pavement CompanyStormville · 3.5 mi away · NPDES NY0087840Recent violation
- Carmel Sch Dist Bus GaragePatterson · 2.3 mi away · NPDES NY0264466
- Camp Edward Isaacs StfEast Fishkill · 4.1 mi away · NPDES NY0101974
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.
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Public boat-access points from the USGS National Boat Ramps inventory
Most recent sample: 2020-09-14
Monitoring stations: 1