Atchison County Lake Quality
Kansas, 3 lakes, average grade F (Algae-prone)
Atchison 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. 2 of those lakes carry an A–F grade. The county-level summary describes that subset, not every water body listed. The county average is F — the most-stressed bracket in our rubric. Most monitored lakes here show persistent nutrient loading and algal pressure.
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 Atchison Co State Fishing Lake (F); the most-stressed is Atchison Co State Fishing Lake (F).
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Quick Answers for Atchison County
Planning a trip? Check special fishing regulations for Atchison Co State Fishing Lake — or check the official Kansas fishing regulations.
All Lakes in Atchison County
3 lakes · 2 graded, 1 not rated2 graded lakes · 1 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | FAtchison Co State Fishing LakeAtchison | F | 2.8 ft | 43.5 µg/L | 40 µg/L | No recent samples | Not recorded |
| 2 | FLake WarnockAtchison | F | 1.7 ft | 509.5 µg/L | 219 µg/L | No recent samples | Not recorded |
| NRAtchison County Park LakeAtchison | NR | 1.2 ft | 280 µg/L | 28 µg/L | No recent samples | Not recorded |
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 Atchison 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.