Massachusetts lake · state assessment record
Lake Quinsigamond
Assessment decisions reported by Massachusetts to EPA under Clean Water Act sections 303(d) and 305(b), last assessed in the 2026 reporting cycle, a cycle that is open for public comment.
- 474
- Assessed acres
- Lake, Freshwater
- Water type
This waterbody in one line
Lake Quinsigamond, a lake in Massachusetts, is assessed as not supporting one or more designated uses, with 10 listed impairment causes in the state's most recent Integrated Report cycle (2026), a cycle that is open for public comment. By assessed acreage it sits among the largest 10% by assessed acreage nationally (38,628 lakes); its impairment list is among the longest nationally (10 listed causes vs 23,610 assessed lakes). Aquatic life is assessed as not supporting. Fish consumption is assessed as not supporting.
- Not Supporting
- overall status
- P90
- Assessed size nationally
- P0
- Shorter cause list
- Not Supporting
- aquatic life
Assessment verdicts are the state agency's decisions as reported to EPA ATTAINS; PlainLakes renders them without modification.
A composite of this record's EPA ATTAINS designated-use verdicts, filed impairment count, and assessment currency, weighted and benchmarked against the national corpus of assessed active waterbodies. This is a water-quality standing, not a human-recreation or property-value judgment, and dimensions with no filed verdict drop out rather than count against the score.
How Lake Quinsigamond reads against the filed register
Paragraphs are selected by this unit's percentiles and use matrix: different lakes lead with different dimensions. Figures are ATTAINS / portal register arithmetic, not advice.
The signature stat: cause-list length
The standout filed fact is cause-list length: 10 listed impairment causes, a longer list than 100% of assessed lake-type units (n=23,610). List length tracks how states sample and code, not a severity score.
No ruled-on use clears the bar
On the uses this filer ruled on, fish consumption, recreation, aquatic life, every determination is Not Supporting. That is a use-by-use reading of the filed record, not a single overall lake grade.
Large assessed unit
At 474 acres, Lake Quinsigamond clears the upper tercile of assessed lake-type units with an area on file (3,857 still larger). Size comparisons use the portal's deduplicated lake ranking population, not raw ATTAINS row counts.
Lake Quinsigamond: Category 5, TMDL still owed
Category 5 is the Integrated Report band where a TMDL (or equivalent) is still expected for Lake Quinsigamond. Read the listed causes and any cleanup actions filed beside them before treating the overall status tile as a finished restoration story.
Large within Massachusetts
Among Massachusetts's 678 indexed units with an area, Lake Quinsigamond ranks 22 by assessed size, toward the large end of that state file.
According to the U.S. Environmental Protection Agency's ATTAINS program, Massachusetts carries 1,191 filed lake-type waterbodies in the August 2026 extract, and this page renders the assessment record EPA assigned to Lake Quinsigamond without modification. See our methodology for reporting-unit limits and gauge linking rules.
The record
Designated-use assessments
Fully Supporting and Not Supporting are the state's definitive verdicts; other entries mean the use was not conclusively assessed in this cycle. For the definitive verdicts on this record, Massachusetts filed the assessment basis as Monitored Data. Those are EPA's own words, not PlainLakes' summary of them.
| Designated use | Group | Verdict |
|---|---|---|
| Fish Consumption | Fish-consumption or fishery | Not Supporting |
| Fish, Other Aquatic Life and Wildlife | Aquatic-life or related | Not Supporting |
| Primary Contact Recreation | Recreation | Not Supporting |
| Secondary Contact Recreation | Recreation | Not Supporting |
| Aesthetic | Other | Insufficient Information |
The record
Listed impairment causes
Causes the state listed as impairing designated uses of this lake, with the cycle each was first listed and the Clean Water Act action recorded against it.
| Cause | Affected uses | First listed | Cleanup standing |
|---|---|---|---|
| Algae | Fish, Other Aquatic Life and Wildlife | 1996 | TMDL approved |
| Eurasian Water Milfoil, Myriophyllum Spicatum | Fish, Other Aquatic Life and Wildlife | 1996 | None reported |
| Non-Native Aquatic Plants | Fish, Other Aquatic Life and Wildlife | 1996 | None reported |
| Dissolved Oxygen | Fish, Other Aquatic Life and Wildlife | 2012 | TMDL approved |
| Enterococcus | Primary Contact Recreation | 2016 | TMDL priority: High |
| Curly-Leaf Pondweed | Fish, Other Aquatic Life and Wildlife | 2020 | None reported |
| Fanwort | Fish, Other Aquatic Life and Wildlife | 2020 | None reported |
| Water Chestnut | Fish, Other Aquatic Life and Wildlife | 2020 | None reported |
| Escherichia coli (E. coli) | Primary Contact Recreation, Secondary Contact Recreation | 2026 | TMDL priority: High |
| PFAS in Fish Tissue | Fish Consumption | 2026 | TMDL priority: Low |
Probable sources named by the state
Each source below is listed under the cause the state filed it against, and carries the word the state filed with it — confirmed, or suspected.
- Algae
- Discharges From Municipal Separate Storm Sewer Systems (MS4) (confirmed)
- Eurasian Water Milfoil, Myriophyllum Spicatum
- Introduction of Non-Native Organisms (Accidental or Intentional) (confirmed)
- Non-Native Aquatic Plants
- Introduction of Non-Native Organisms (Accidental or Intentional) (confirmed)
- Dissolved Oxygen
- Discharges From Municipal Separate Storm Sewer Systems (MS4) (confirmed)
- Enterococcus
- Discharges From Municipal Separate Storm Sewer Systems (MS4) (confirmed)
- Curly-Leaf Pondweed
- Introduction of Non-Native Organisms (Accidental or Intentional) (confirmed)
- Fanwort
- Introduction of Non-Native Organisms (Accidental or Intentional) (confirmed)
- Water Chestnut
- Introduction of Non-Native Organisms (Accidental or Intentional) (confirmed)
- Escherichia coli (E. coli)
- Discharges From Municipal Separate Storm Sewer Systems (MS4) (confirmed)
Massachusetts also recorded the source of at least one listing here as unknown, including for Enterococcus, Escherichia coli (E. coli), and PFAS in Fish Tissue.
Reading the record
Cleanup queue for Lake Quinsigamond
2 listed causes ranked High in the TMDL queue, still without a plan
Massachusetts ranked 2 listed causes high in its TMDL development queue, and no cleanup plan is on file for those listings yet. That queue rank is the state's own scheduling signal, not an EPA national rule.
A High ranking names a position in the state's plan-writing queue; it is not a measure of how impaired the water is. How listing and cleanup work.
Scale and rank
Lake Quinsigamond is one of 1,191 lake-type waterbodies reported to EPA from Massachusetts, and one of 678 whose reported record carries enough populated assessment or gauge data for this site to list and index it. At 474 assessed acres it ranks 3,858th by assessed size among the 38,628 lakes the dataset carries an area for, counting a state’s repeated filings of one water once, behind 3,857 lakes with a larger one.
In context
Where Lake Quinsigamond sits nationally
Assessed size among U.S. lakes
Distribution of assessed acreage across ATTAINS lakes filed with an area, counting a state’s repeated filings of one water once
474 Top 10% larger than 90% of 38,628 lakes
lakes the dataset carries an area for, counting a state’s repeated filings of one water once, bucketed by value
Source EPA ATTAINS · Reporting cycles 1987–2026
Listed causes vs waterbodies carrying a verdict
How many impairment causes U.S. waterbodies with a reported verdict carry
10 Longer than most more listed causes than 99%+ of 23,610 waterbodies carrying a verdict
named waterbodies carrying a verdict, bucketed by value
Source EPA ATTAINS · Reporting cycles 1987–2026
In both charts each bar is a band and taller bars hold more waterbodies; the dashed line and filled bar mark Lake Quinsigamond. Hover or tap any bar for its full count and share.
In context
Massachusetts context
ATTAINS carries 1,191 lake-type waterbodies in Massachusetts, 678 assessed as not supporting at least one use and 40 fully supporting. Among the 678 indexed units there, Lake Quinsigamond ranks 1st by listed-cause count (10 listed causes) and 22nd by assessed size among the 678 with an area filed; it sits in the not-supporting set (678 statewide) . Its listed causes include Non-Native Aquatic Plants, Dissolved Oxygen, and Fanwort, which also appear among Massachusetts's most-filed impairment causes (led by Mercury in Fish Tissue). It also lists Algae; Eurasian Water Milfoil, Myriophyllum Spicatum; Enterococcus; Curly-Leaf Pondweed; Water Chestnut; Escherichia coli (E. coli); and PFAS in Fish Tissue, outside that top-five list.
| Other large assessed lakes in Massachusetts | Assessed acres |
|---|---|
| Quabbin Reservoir Not Supporting | 24,010 |
| Wachusett Reservoir Not Supporting | 3,962 |
| Assawompset Pond Not Assessed | 2,034 |
| North Watuppa Pond Not Supporting | 1,728 |
| Long Pond Not Supporting | 1,728 |
| South Watuppa Pond Not Supporting | 1,473 |
Peers near Lake Quinsigamond's size or cause load
Similar assessed acres
Nearest filed extents (474 acres here).
- Union Lake · 474 acres · MI
- Millsite Lake · 474 acres · NY
- Alabama River (Claiborne Lake) · 474 acres · AL
- Crooked · 474 acres · MN
Similar cause load
Nearest listed-cause counts (10 here). Peers already in the acreage column are omitted.
- Brownlee Reservoir · 10 causes · OR
- Campus · 10 causes · IL
- Cooper River (above Evesham Road) · 10 causes · NJ
- Fox · 10 causes · IL
What to do with this record
- The fish-consumption use is assessed as not supporting. Before eating fish from this lake, check your state fish-advisory program for species-specific meal limits. Consumption status guide
- Impairment listings follow the Clean Water Act 303(d) process; a listing is a regulatory finding, not a closure notice. 303(d) explained
PlainLakes renders state assessment decisions and federal gauge observations without modification. It does not issue advisories.
Assessment decisions on this page are rendered directly from state Integrated Report records in EPA's ATTAINS system; gauge figures are daily-value observations from the USGS National Water Information System, no number is typed in by an editor. Overall status, use verdicts, and causes are the state's reported decisions for assessment unit MA51125. Counts and percentiles are computed across all lake-type records PlainLakes ingests from ATTAINS. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2026-08-17. Primary sources: EPA ATTAINS and USGS National Water Information System.