Simpson County Lake Quality
Mississippi, 1 lake, average grade D (Nutrient-rich)
Only 1 lakes in Simpson 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. The county-wide average grade is D — water quality issues are persistent across most of the monitored basins. 0 lakes fall into the F bracket outright.
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. Simpson Legion State Fishing Lake (D) is the cleanest in the county.
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Quick Answers for Simpson County
Planning a trip? Check special fishing regulations for Simpson Legion State Fishing Lake — or check the official Mississippi fishing regulations.
All Lakes in Simpson County
1 lake1 graded lake
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | DSimpson Legion State Fishing LakeSimpson | D | 4.9 ft | 130 µg/L | 23.4 µg/L | No recent samples | Not recorded |
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Other Counties in Mississippi
See how Simpson County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 49 states and 2 Canadian provinces.
Source: EPA National Aquatic Resource Surveys, 2026.