Washington County Lake Quality
Indiana, 4 lakes, average grade B (Good)
Only 4 lakes in Washington 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. a leading lake (—) is the cleanest in the county.
Quick Answers for Washington County
All Lakes in Washington County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|
Other Counties in Indiana
See how Washington 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.