Sioux County Lake Quality

Sioux County holds 8 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. On average, Sioux County lakes grade an A. That puts it near the top of the Nebraska county ranking.

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 Lake Carter P Johnson (A); the most-stressed is Lake Carter P Johnson (A).