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LakeQuality
Late afternoon sun over Slim Lake, scattering a bright path across wind-textured water
F

Duplin County Lake Quality

North Carolina, 6 lakes, average grade F (Algae-prone)

Duplin County holds 6 monitored lakes. With a sample that small the county-level summary describes those specific waters, not necessarily every water body in the county. 1 of those lake carry an A–F grade. The county-level summary describes that subset, not every water body listed. The county average is F — the most-stressed bracket in our rubric. Most monitored lakes here show persistent nutrient loading and algal pressure.

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. Limestone Lake (F) is the cleanest in the county.

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All Lakes in Duplin County

6 lakes · 1 graded, 5 not rated1 graded lake · 5 not rated, hidden

#LakeGradeClarityPhosphorusAlgaeTrophicAccess
1FLimestone LakeDuplinF2.3 ft50 µg/L63 µg/LNo recent samplesNot recorded
NRBoney Mill PondDuplinNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRJohnsons LakeDuplinNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRWhitfields PondDuplinNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRMaxwell MillpondDuplinNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded
NRBowden MillpondDuplinNRNo recent samplesNo recent samplesNo recent samplesNo recent samplesNot recorded

NR = not rated: there is not enough recent sampling to support a letter. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.

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Source: EPA National Aquatic Resource Surveys, 2026.