Lake Mattawa
Franklin County, Massachusetts118 acresView mapDirections
No nutrient or algae sampling on record from MassDEP for this lake.
- Impaired · Nuisance exotic species
- 35 ft max depth
Lake Mattawa in Franklin County, Massachusetts has water-quality measurements published by MassDEP, shown here as reported. Maximum depth: 35 ft. Surface area: 118 acres.
Lake Mattawa is a 118-acre lake in Franklin County, Massachusetts with a maximum depth of 35 feet.
Source: EPA Water Quality Portal sampling records, MassDEP. Methodology: how these readings are compared.
What Lake Mattawa is good for
From access and monitoring records, not editorial picks.
- Deep water35 ft surveyed max depth
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Lake Mattawa is listed impaired under Clean Water Act §303(d) (IR 4C) for nuisance exotic species. Check local advisories before you swim.
Whether Lake Mattawa 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 Lake Mattawa
These are the measurements MassDEP publishes for Lake Mattawa, 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 Lake Mattawa
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
35 ft
Surface area
118 acres
Shoreline
2.3 mi
The depth above comes from a bathymetric survey of this lake, not from a regional estimate.
Stays via Stay22
Stays near Lake Mattawa
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Fishing Lake Mattawa
EPA Impairment Status
Lake Mattawa is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4C).
Causes of impairment
Designated uses not supporting: Aquatic life.
Source: EPA ATTAINS assessment unit MA35112 · Official waterbody report
Nearby Lakes in Franklin County
Frequently asked questions about Lake Mattawa
Where is Lake Mattawa?
- Lake Mattawa is a lake in Franklin County, Massachusetts. Its water-quality measurements are published by MassDEP and shown on this page as reported.
What is the water quality of Lake Mattawa?
- Lake Mattawa in Franklin County, Massachusetts has water-quality measurements published by MassDEP, shown here as reported. Maximum depth: 35 ft. Surface area: 118 acres.
Is Lake Mattawa safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Lake Mattawa is listed impaired under Clean Water Act §303(d) (IR 4C) for nuisance exotic species. Check local advisories before you swim.
How deep is Lake Mattawa?
- Lake Mattawa has a maximum depth of 35 feet. The lake covers 118 acres.
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Where this data comes from
Measurements for Lake Mattawa 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