Sedgwick County Lake Quality
Kansas, 8 lakes, average grade D (Nutrient-rich)
Sedgwick County has 8 monitored lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. 2 of those lakes carry an A–F grade. The county-level summary describes that subset, not every water body listed. The county-wide average grade is D — water quality issues are persistent across most of the monitored basins. 1 lakes fall into the F bracket outright.
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. Cheney Lake (D) is the cleanest in the county.
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Quick Answers for Sedgwick County
Planning a trip? Check special fishing regulations for Cheney Lake — or check the official Kansas fishing regulations.
All Lakes in Sedgwick County
8 lakes · 2 graded, 6 not rated2 graded lakes · 6 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | DCheney LakeSedgwick | D | 2.5 ft | 100 µg/L | 18.5 µg/L | No recent samples | ✓ Public |
| 2 | FLake AftonSedgwick | F | 1.7 ft | 170 µg/L | 90.1 µg/L | No recent samples | Not recorded |
| NRChisholm Creek Park Lake SouthSedgwick | NR | 1.1 ft | 205 µg/L | 97 µg/L | No recent samples | Not recorded | |
| NRRiggs Park LakeSedgwick | NR | 0.3 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRColwich City LakeSedgwick | NR | 0.8 ft | 900 µg/L | No recent samples | No recent samples | Not recorded | |
| NRTallowood Drive LakeSedgwick | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRBeech LakeSedgwick | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRLake WaltannaSedgwick | NR | No recent samples | No recent samples | No recent samples | 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 Sedgwick 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.