Wastewater Treatment Plants in Kansas
354 facilities · 157 MGD combined flow
Klarifi tracks 354 publicly owned wastewater treatment plants in Kansas with a combined average flow of 157 MGD, serving about 1,593,571 residents. 33 plants treat more than 1 MGD and 4 more than 10 MGD; 288 use lagoon systems and 31 have digesters or biogas infrastructure. The largest is Kansas City Water Pollution Control Div. in Kansas City at 15.44 MGD. 42 NPDES permits expire this year and 56 next year.
Every plant below links to a profile with average and design flow, treatment technology, the NPDES permit and its expiry, a three-year compliance snapshot and the capital projects planned in its city. Showing facilities 1–200 of 354 by average flow — browse the rest with the page links below.
354 plant locations in Kansas; dot size follows average flow.
NPDES permits and renewals in Kansas
Every plant discharges under an NPDES permit that is renewed every five years, usually with tighter limits. The renewal year is the year a plant budgets for upgrades.
Largest wastewater treatment plants in Kansas
| Facility | City | Avg flow (MGD) | Design (MGD) | NPDES permit | Expires | Technology | Violations (3y) |
|---|---|---|---|---|---|---|---|
| Kansas City Water Pollution Control Div. | Kansas City | 15.44 | — | KS0038563 | May 2030 | Clarifiers, Biogas silos, Biogas balloons | 0 |
| Joco Tomahawk Creek | Leawood | 12.13 | — | KS0100854 | Apr 2031 | Clarifiers, Biogas silos, Biogas balloons | 1 |
| Topeka Oakland Wastewater Plant | Topeka | 10.55 | — | KS0042722 | Jan 2027 | Carrousels / oxidation ditches, Biogas silos, Biogas balloons | 63 |
| Joco Douglas Smith Mid Basin | Overland Park | 10.2 | — | KS0119601 | Feb 2027 | Aerated lagoons, Biogas silos, Biogas balloons | 0 |
| Joco Mill Creek Regional Wtf | Shawnee | 9.47 | — | KS0088269 | Jan 2030 | Clarifiers, Aerated lagoons, Uncovered lagoons | 0 |
| Joco Nelson Complex Wastewater Plant | Mission | 7.21 | — | KS0055492 | Jan 2030 | Clarifiers, Biogas silos, Biogas balloons | 50 |
| Lawrence, City Of | Lawrence | 6.02 | — | KS0038644 | Jul 2029 | Clarifiers, Uncovered lagoons, Biogas silos, Biogas balloons | 14 |
| Joco Blue River District #1 | Stanley | 5.14 | — | KS0092738 | Dec 2027 | Clarifiers, Aerated lagoons, Biogas balloons | 0 |
| Emporia Wastewater Treatment Plant | Emporia | 4.23 | — | KS0046728 | Apr 2028 | Clarifiers, Biogas silos | 27 |
| Salina, City Of | Salina | 3.98 | — | KS0038474 | Dec 2029 | Clarifiers, Biogas silos | 5 |
| Hutchinson, City Of | Hutchinson | 3.74 | — | KS0036188 | Dec 2028 | Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches, Biogas silos | 16 |
| Olathe (cedar Creek) Wastewater Plant | Olathe | 3.74 | — | KS0081299 | Dec 2029 | Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches | 0 |
| City Of Coffeyville WTP | Coffeyville | 3.25 | — | KS0050733 | Dec 2026 | Uncovered lagoons | 22 |
| Leavenworth, City Of | Leavenworth | 3.18 | — | KS0036366 | Feb 2028 | Clarifiers, Biogas balloons | 11 |
| Pittsburg City Of Mun WWTP | Pittsburg | 2.7 | — | KS0200022 | Jun 2028 | Clarifiers, Biogas silos | 68 |
| Kansas City (plant No.20) WWTP | Kansas City | 2.64 | — | KS0080195 | Dec 2026 | Clarifiers | 74 |
| Wichita - Four Mile Creek - New | Wichita | 2.41 | — | KS0100790 | Dec 2026 | Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches | 10 |
| Garden City, City Of | Garden City | 2.38 | — | KS0038962 | Dec 2026 | Clarifiers, Carrousels / oxidation ditches | 3 |
| Derby Wastewater Treatment | Derby | 2.19 | — | KS0050377 | Dec 2027 | Clarifiers, Carrousels / oxidation ditches | 61 |
| Hays, City Of - Chetolah Creek Water Re | Hays | 2.04 | — | KS0100820 | Dec 2030 | Clarifiers, Carrousels / oxidation ditches | 0 |
| Lawrence, City Of (wakarusa) | Lawrence | 1.94 | — | KS0099031 | Aug 2029 | Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches | 0 |
| Winfield, City Of | Winfield | 1.87 | — | KS0051926 | Nov 2030 | Clarifiers, Carrousels / oxidation ditches, Biogas silos | 49 |
| Junction City Wastewater Department | Junction City | 1.84 | — | KS0034011 | Dec 2026 | Clarifiers, Aerated lagoons, Uncovered lagoons, Biogas silos | 44 |
| Gardner - Kill Creek | Gardner | 1.83 | — | KS0095605 | Oct 2026 | Clarifiers, Carrousels / oxidation ditches | 79 |
| Arkansas City Mwwtp | Arkansas City | 1.61 | — | KS0044831 | Feb 2028 | Clarifiers, Biogas silos | 12 |
Kansas plants by treatment technology
All 354 plants in Kansas
Wastewater treatment 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.