Norfolk County Lake Quality
Massachusetts, 2 lakes, average grade A (Excellent)
Only 2 lakes in Norfolk 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. On average, Norfolk County lakes grade an A. That puts it near the top of the {{stateName}} county ranking.
Most of the county's monitored lakes are shallow — under 50 feet — which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed. Lake Pearl (A) is the cleanest in the county.
Quick Answers for Norfolk County
Planning a trip? Check special fishing regulations for Lake Pearl — or check the official Massachusetts fishing regulations.
All Lakes in Norfolk County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Lake Pearl | A | - | - |
| 2 | Ponkapoag Pond | A | - | - |
Other Counties in Massachusetts
See how Norfolk 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 Norfolk County
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Source: EPA National Aquatic Resource Surveys, 2026.