Cleanest Lakes in Marshall County, Iowa
Sand Lake in Marshall County leads the rankings with a water quality grade of A and 6.4 ft of clarity. Below are the top 3 cleanest monitored lakes in Marshall County, Iowa, ranked by EPA water quality score.
Ranked List
| # | Lake | County | Grade | Clarity | Phosphorus | Algae |
|---|---|---|---|---|---|---|
| 1 | Sand Lake | Marshall | A | 6.4 ft | 25 µg/L | 3.6 µg/L |
| 2 | Green Castle Lake | Marshall | C | 4.6 ft | 59 µg/L | 6.9 µg/L |
| 3 | Crab Tree Lake | Marshall | NR | - | - | - |
More Answers for Marshall County, Iowa
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