Quabbin Reservoir
Worcester County, Massachusetts24,043 acresView mapDirections
No nutrient or algae sampling on record from MassDEP for this lake.
- Impaired · Mercury
- 150 ft max depth
Quabbin Reservoir in Worcester County, Massachusetts has water-quality measurements published by MassDEP, shown here as reported. Maximum depth: 150 ft. Surface area: 24043 acres.
Quabbin Reservoir is a 24,043-acre lake in Worcester County, Massachusetts with a maximum depth of 150 feet (45-foot average).
Source: EPA Water Quality Portal sampling records, MassDEP. Methodology: how these readings are compared.
What Quabbin Reservoir is good for
From access and monitoring records, not editorial picks.
- Deep water150 ft surveyed max depth
- Big water24,043 acres
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Quabbin Reservoir is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, nuisance exotic species. Check local advisories before you swim.
Whether Quabbin Reservoir is safe to swim in today is a call for the Massachusetts Department of Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Quabbin Reservoir
These are the measurements MassDEP publishes for Quabbin Reservoir, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. TSI undefined.
Ask about Quabbin Reservoir
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
150 ft
Average depth
45 ft
Surface area
24,043 acres
Shoreline
106.2 mi
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Fishing Quabbin Reservoir
EPA Impairment Status
Quabbin Reservoir 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, Fish consumption.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MA36129 · Official waterbody report
Nearby Lakes in Worcester County
Frequently asked questions about Quabbin Reservoir
Where is Quabbin Reservoir?
- Quabbin Reservoir is a lake in Worcester County, Massachusetts. Its water-quality measurements are published by MassDEP and shown on this page as reported.
What is the water quality of Quabbin Reservoir?
- Quabbin Reservoir in Worcester County, Massachusetts has water-quality measurements published by MassDEP, shown here as reported. Maximum depth: 150 ft. Surface area: 24043 acres.
Is Quabbin Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Quabbin Reservoir is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, nuisance exotic species. Check local advisories before you swim.
How deep is Quabbin Reservoir?
- Quabbin Reservoir has a maximum depth of 150 feet and an average depth of 45 feet. The lake covers 24043 acres.
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Where this data comes from
Measurements for Quabbin Reservoir come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database