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F

Warren County Lake Quality

Iowa, 2 lakes, average grade F (Very Poor)

Warren County has 2 graded lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. 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. Hooper Pond Lake (D) is the cleanest in the county.

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All Lakes in Warren County

RankLakeGradeClarityPhosphorus
1Hooper Pond LakeD2.5 ft-
2Lake AhquabiF1.8 ft-

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

Where to stay near Warren County

Top-rated places to stay near Warren County

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Source: EPA National Aquatic Resource Surveys, 2026.