Activated sludge and clarifiers: wastewater treatment plants in Kansas
58 plants · 16% of the state · 117 MGD reported by 55 plants
Klarifi identifies 58 publicly owned wastewater treatment plants with activated sludge and clarifiers in Kansas, 16% of the 354 plants in the state (117 MGD reported by 55 plants). The largest is Kansas City Water Pollution Control Div. in Kansas City at 15.44 MGD.
Activated sludge is the standard mechanical process for cities: aeration basins where bacteria consume organic matter, followed by clarifiers that settle the biomass out. These plants are identified by their circular or rectangular clarifiers and by the suspended-growth process code, and they are the main market for blowers, diffusers, clarifier mechanisms and instrumentation.
The largest activated sludge plants in Kansas
| # | Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| 1 | Kansas City Water Pollution Control Div. | Kansas City | 15.44 | KS0038563 | May 2030 | 0 |
| 2 | Joco Tomahawk Creek | Leawood | 12.13 | KS0100854 | Apr 2031 | 1 |
| 3 | Joco Mill Creek Regional Wtf | Shawnee | 9.47 | KS0088269 | Jan 2030 | 0 |
| 4 | Joco Nelson Complex Wastewater Plant | Mission | 7.21 | KS0055492 | Jan 2030 | 50 |
| 5 | Lawrence, City Of | Lawrence | 6.02 | KS0038644 | Jul 2029 | 14 |
| 6 | Joco Blue River District #1 | Stanley | 5.14 | KS0092738 | Dec 2027 | 0 |
| 7 | Emporia Wastewater Treatment Plant | Emporia | 4.23 | KS0046728 | Apr 2028 | 27 |
| 8 | Salina, City Of | Salina | 3.98 | KS0038474 | Dec 2029 | 5 |
| 9 | Hutchinson, City Of | Hutchinson | 3.74 | KS0036188 | Dec 2028 | 16 |
| 10 | Olathe (cedar Creek) Wastewater Plant | Olathe | 3.74 | KS0081299 | Dec 2029 | 0 |
| 11 | Leavenworth, City Of | Leavenworth | 3.18 | KS0036366 | Feb 2028 | 11 |
| 12 | Pittsburg City Of Mun WWTP | Pittsburg | 2.7 | KS0200022 | Jun 2028 | 68 |
| 13 | Kansas City (plant No.20) WWTP | Kansas City | 2.64 | KS0080195 | Dec 2026 | 74 |
| 14 | Wichita - Four Mile Creek - New | Wichita | 2.41 | KS0100790 | Dec 2026 | 10 |
| 15 | Garden City, City Of | Garden City | 2.38 | KS0038962 | Dec 2026 | 3 |
| 16 | Derby Wastewater Treatment | Derby | 2.19 | KS0050377 | Dec 2027 | 61 |
| 17 | Hays, City Of - Chetolah Creek Water Re | Hays | 2.04 | KS0100820 | Dec 2030 | 0 |
| 18 | Lawrence, City Of (wakarusa) | Lawrence | 1.94 | KS0099031 | Aug 2029 | 0 |
| 19 | Winfield, City Of | Winfield | 1.87 | KS0051926 | Nov 2030 | 49 |
| 20 | Junction City Wastewater Department | Junction City | 1.84 | KS0034011 | Dec 2026 | 44 |
| 21 | Gardner - Kill Creek | Gardner | 1.83 | KS0095605 | Oct 2026 | 79 |
| 22 | Arkansas City Mwwtp | Arkansas City | 1.61 | KS0044831 | Feb 2028 | 12 |
| 23 | Chanute, City Of | Chanute | 1.47 | KS0080837 | Jan 2028 | 1 |
| 24 | Chisholm Creek Utility Authority | Park City | 1.4 | KS0089176 | Nov 2027 | 89 |
| 25 | Liberal Mechanical Plant (new) | Liberal | 1.36 | KS0100986 | Jun 2029 | 39 |
Contacts and project signals for every plant on this list
Klarifi adds verified decision-maker contacts, permit limits, discharge monitoring data and the capital projects planned in each city, filterable by technology, size and compliance record.
Other technologies in Kansas
Activated sludge and clarifiers in other states
Activated sludge and clarifiers in Kansas: questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed September 11, 2026.