Bristol County Lake Quality
Massachusetts, 4 lakes, average grade C (Fair)
Only 4 lakes in Bristol County carry an active grade. The county-level summary is therefore representative of those specific lakes, not necessarily of every water body in the county. Bristol County averages to a C. The distribution behind that average matters more than the letter: a few stressed lakes versus many decent ones can produce the same average as the inverse.
The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Watson Pond (B); the most-stressed is South Watuppa Pond (F).
Quick Answers for Bristol County
Planning a trip? Check special fishing regulations for Watson Pond — or check the official Massachusetts fishing regulations.
All Lakes in Bristol County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Watson Pond | B | - | - |
| 2 | Ames Long Pond | B | - | - |
| 3 | Ten Mile River Lake | D | - | - |
| 4 | South Watuppa Pond | F | - | - |
Other Counties in Massachusetts
See how Bristol County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 36 states.
Where to stay near Bristol County
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Source: EPA National Aquatic Resource Surveys, 2026.