The State of Kansas's Lakes 2026

Cleanest lakes in Kansas

Highest combined water-quality score, 2026.

1. 1.CHillsdale Lake — Miami County3.7 ft clarity · 29 µg/L P · 17 µg/L chl-a
2. 2.CLenexa Lake — Johnson County29 µg/L P · 16 µg/L chl-a
3. 3.DCheney Lake — Sedgwick County2.5 ft clarity · 100 µg/L P · 19 µg/L chl-a
4. 4.DStoll Park Lake — Johnson County70 µg/L P · 22 µg/L chl-a
5. 5.FMilford Lake — Clay County1.6 ft clarity · 610 µg/L P · 35 µg/L chl-a
6. 6.FPerry Lake — Jefferson County3.1 ft clarity · 77 µg/L P · 37 µg/L chl-a
7. 7.FMarion Lake — Marion County2.0 ft clarity · 230 µg/L P · 36 µg/L chl-a
8. 8.FCedar Lake — Johnson County1.6 ft clarity · 113 µg/L P · 40 µg/L chl-a
9. 9.FKingston Lake Park — Johnson County130 µg/L P · 59 µg/L chl-a
10. 10.FSar Ko Park Lake — Johnson County87 µg/L P · 52 µg/L chl-a

Most-polluted lakes

Lowest combined water-quality score among monitored lakes.

1. 1.FMilford Lake — Clay County1.6 ft clarity · 610 µg/L P · 35 µg/L chl-a
2. 2.FPerry Lake — Jefferson County3.1 ft clarity · 77 µg/L P · 37 µg/L chl-a
3. 3.FMarion Lake — Marion County2.0 ft clarity · 230 µg/L P · 36 µg/L chl-a
4. 4.FCedar Lake — Johnson County1.6 ft clarity · 113 µg/L P · 40 µg/L chl-a
5. 5.FKingston Lake Park — Johnson County130 µg/L P · 59 µg/L chl-a
6. 6.FSar Ko Park Lake — Johnson County87 µg/L P · 52 µg/L chl-a
7. 7.FTomahawk Creek Park Lake — Johnson County162 µg/L P · 46 µg/L chl-a
8. 8.FSouth Lake — Johnson County177 µg/L P · 72 µg/L chl-a
9. 9.FPierson Lake — Wyandotte County89 µg/L P · 33 µg/L chl-a
10. 10.FLeawood Park Lake — Johnson County533 µg/L P · 42 µg/L chl-a

Worst algae hotspots

Highest measured chlorophyll-a (algae) concentration.

1. 1.NRMarais des Cygnes Wildlife Area Lake — Linn County454 µg/L chlorophyll-a
2. 2.NRMarais des Cygnes Nwr Lake — Linn County255 µg/L chlorophyll-a
3. 3.FEllis City Lake — Ellis County250 µg/L chlorophyll-a
4. 4.FLake Warnock — Atchison County219 µg/L chlorophyll-a
5. 5.NRHarvey Co East Lake — Harvey County205 µg/L chlorophyll-a
6. 6.NRGathering Pond East — Geary County189 µg/L chlorophyll-a
7. 7.FCheyenne Bottoms Pool — Barton County174 µg/L chlorophyll-a
8. 8.NROgden City Lake — Riley County169 µg/L chlorophyll-a
9. 9.NRGarnett Lake — Anderson County160 µg/L chlorophyll-a
10. 10.NRLittle Lake — Brown County155 µg/L chlorophyll-a

Trending lakes

Improving

1. 1.BGeary Co State Fishing Lake — Geary County
2. 2.BLake Wabaunsee — Wabaunsee County
3. 3.BLouisburg State Fishing Lake — Miami County
4. 4.BNew Olathe Lake — Johnson County
5. 5.BMadison City Lake — Greenwood County
6. 6.COlathe Lake — Johnson County
7. 7.CClinton Lake — Douglas County
8. 8.CKanopolis Lake — Ellsworth County

Declining

1. 1.FMilford Lake — Clay County
2. 2.FMarion Co Lake — Marion County
3. 3.FLake Afton — Sedgwick County
4. 4.FMiami Co State Fishing Lake — Miami County
5. 5.FGardner Lake — Johnson County
6. 6.FWellington New City Lake — Sumner County
7. 7.FHarvey Co West Park Lake — Harvey County
8. 8.FAnthony City Lake — Harper County