Nemaha County Lake Quality
Kansas, 3 lakes — no lake here has enough monitoring data for a grade
Nemaha County holds 3 monitored lakes. With a sample that small the county-level summary describes those specific waters, not necessarily every water body in the county. No lake in Nemaha County has enough sampling behind it for an A–F grade yet. The 3 monitored lakes below carry whatever clarity, phosphorus, and chlorophyll-a measurements exist.
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.
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Quick Answers for Nemaha County
Planning a trip? Check special fishing regulations for Centralia Lake — or check the official Kansas fishing regulations.
All Lakes in Nemaha County
3 lakes · 0 graded, 3 not rated0 graded lakes · 3 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| NRCentralia LakeNemaha | NR | 2.1 ft | 140 µg/L | 21 µg/L | No recent samples | Not recorded | |
| NRSabetha City LakeNemaha | NR | 2.1 ft | 175 µg/L | 11 µg/L | No recent samples | Not recorded | |
| NRNemaha Co State Fishing LakeNemaha | NR | 1.6 ft | No recent samples | 14.7 µg/L | No recent samples | ✓ Public |
NR = not rated: there is not enough recent sampling to support a letter. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.
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Other Counties in Kansas
See how Nemaha County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..
Source: EPA National Aquatic Resource Surveys, 2026.