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LakeQuality
F

Audubon County Lake Quality

Iowa, 1 lakes, average grade F (Very Poor)

Only 1 lakes in Audubon 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 average is F — the most-stressed bracket in our rubric. Most monitored lakes here show persistent nutrient loading and algal pressure.

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 Littlefield Lake (F); the most-stressed is Littlefield Lake (F).

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All Lakes in Audubon County

RankLakeGradeClarityPhosphorus
1Littlefield LakeF0.9 ft-

See how Audubon County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 15 states.

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Source: EPA National Aquatic Resource Surveys, 2026.