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LakeQuality
B

Monroe County Lake Quality

Mississippi, 3 lakes, average grade B (Good)

Only 3 lakes in Monroe 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 lands at B — solid water quality with most lakes carrying clear summer transparency and low-to-moderate phosphorus.

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. Pool A (B) is the cleanest in the county.

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All Lakes in Monroe County

3 lakes3 graded lakes

#LakeGradeClarityPhosphorusAlgaeTrophicAccess
1BPool AMonroeB2 ft40 µg/L9.9 µg/LNo recent samplesNot recorded
2BPool BMonroeB2 ft40 µg/L10.1 µg/LNo recent samplesNot recorded
3CAberdeen LakeMonroeC1.6 ft50 µg/L18.6 µg/LNo recent samplesNot recorded

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See how Monroe 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.