What is the largest wastewater treatment plant in Kansas?

Kansas City Water Pollution Control Div. in Kansas City, treating an average of 17.31 MGD under NPDES permit KS0038563. Joco Tomahawk Creek in Leawood is second at 14.9 MGD.

How much wastewater do Kansas’s largest plants treat?

The 50 largest plants treat 160 MGD combined, 92% of the flow reported by all 355 publicly owned plants in Kansas.

How is plant size measured?

By reported average daily flow in million gallons per day (MGD) from EPA discharge monitoring reports, the standard measure of a plant’s size. Design capacity, the flow a plant is permitted to treat, is usually higher and is shown on each profile.

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The 50 largest wastewater treatment plants in Kansas

Name: Largest wastewater treatment plants in Kansas
Creator: Klarifi
License: https://klarifi.io/terms-of-service

Ranked by average flow · 160 MGD combined · 92% of the state's reported flow

Kansas City Water Pollution Control Div. in Kansas City is the largest publicly owned wastewater treatment plant in Kansas by reported average flow, treating about 17.31 million gallons per day. The 50 plants below treat 160 MGD between them, 92% of the flow reported by all 355 plants in the state, and serve about 1,256,601 people. Every plant links to its profile with permit and compliance data. Treatment technology is shown with a free Klarifi account.

All plants in Kansas →The 50 largest US plants →Kansas NPDES permits →

The 50 largest publicly owned wastewater treatment plants in Kansas by average flow (MGD), with population served, NPDES permit, expiry and three-year violation count.
#	Facility	City	Avg flow (MGD)	Population	NPDES permit	Expires	Violations (3y)
1	Kansas City Water Pollution Control Div.	Kansas City	17.31	131,272	KS0038563	May 2030	0
2	Joco Tomahawk Creek	Leawood	14.9	43,021	KS0100854	Apr 2031	1
3	Joco Mill Creek Regional Wtf	Shawnee	11.46	80,102	KS0088269	Jan 2030	0
4	Joco Nelson Complex Wastewater Plant	Mission	11.17	104,169	KS0055492	Jan 2030	50
5	Topeka Oakland Wastewater Plant	Topeka	11.13	82,311	KS0042722	Jan 2027	64
6	Joco Douglas Smith Mid Basin	Overland Park	10.79	126,584	KS0119601	Feb 2027	0
7	Lawrence, City Of	Lawrence	7.45	54,351	KS0038644	Jul 2029	14
8	Joco Blue River District #1	Stanley	6.3	34,065	KS0092738	Dec 2027	0
9	Olathe (cedar Creek) Wastewater Plant	Olathe	4.47	25,518	KS0081299	Dec 2029	0
10	Emporia Wastewater Treatment Plant	Emporia	4.21	24,587	KS0046728	Apr 2028	27
11	Salina, City Of	Salina	3.71	50,449	KS0038474	Dec 2029	5
12	Leavenworth, City Of	Leavenworth	3.43	33,527	KS0036366	Feb 2028	10
13	Hutchinson, City Of	Hutchinson	3.3	41,940	KS0036188	Dec 2028	17
14	Kansas City (plant No.20) WWTP	Kansas City	2.59	27,272	KS0080195	Dec 2026	75
15	Garden City, City Of	Garden City	2.56	27,914	KS0038962	Dec 2026	3
16	Pittsburg City Of Mun WWTP	Pittsburg	2.47	19,968	KS0200022	Jun 2028	69
17	City Of Coffeyville WTP	Coffeyville	2.38	9,890	KS0050733	Dec 2026	20
18	Wichita - Four Mile Creek - New	Wichita	2.38	10,376	KS0100790	Dec 2026	9
19	Fort Scott, City Of (new Plant)	Fort Scott	2.33	8,928	KS0095923	Oct 2028	35
20	Gardner - Kill Creek	Gardner	2.06	20,208	KS0095605	Oct 2026	79
21	Derby Wastewater Treatment	Derby	2.03	17,546	KS0050377	Dec 2027	61
22	Lawrence, City Of (wakarusa)	Lawrence	1.97	35,952	KS0099031	Aug 2029	0
23	Chanute, City Of	Chanute	1.83	9,018	KS0080837	Jan 2028	1
24	Olathe Harold (main Plant)	Olathe	1.61	32,213	KS0045802	Jun 2028	5
25	Wolcott Wastewater Treatment Facility	Kansas City	1.52	—	KS0101516	May 2029	4
26	Paola, City Of	Paola	1.47	5,484	KS0097616	Dec 2029	1
27	Arkansas City Mwwtp	Arkansas City	1.46	11,402	KS0044831	Feb 2028	12
28	Hays, City Of - Chetolah Creek Water Re	Hays	1.33	18,317	KS0100820	Dec 2030	0
29	Junction City Wastewater Department	Junction City	1.32	13,582	KS0034011	Dec 2026	43
30	Winfield, City Of	Winfield	1.28	10,357	KS0051926	Nov 2030	49
31	Liberal Mechanical Plant (new)	Liberal	1.19	—	KS0100986	Jun 2029	36
32	Chisholm Creek Utility Authority	Park City	1.13	13,609	KS0089176	Nov 2027	96
33	Parsons WWTP	Parsons	1.09	11,310	KS0097560	Sep 2028	4
34	Sherwood Reg WWTP	Topeka	1.07	15,321	KS0117731	Jun 2030	4
35	Great Bend, City Of	Great Bend	1	15,366	KS0038491	Dec 2026	0
36	Baxter Springs WWTP	Baxter Springs	0.99	4,522	KS0045934	May 2028	10
37	Augusta WWTP	Augusta	0.99	9,300	KS0094561	Sep 2027	41
38	Independence, City Of	Independence	0.96	9,787	KS0095486	Dec 2026	4
39	Wichita #3 Wastewater Plant	Wichita	0.94	4,160	KS0095681	Oct 2027	0
40	Basehor, City Of	Basehor	0.92	5,981	KS0094382	Aug 2027	3
41	Junction City - Southwest Wastewater Pt	Junction City	0.91	2,054	KS0092151	Aug 2029	58
42	Atchison, City Of	Atchison	0.9	9,367	KS0039128	Dec 2028	7
43	Ottawa, City Of (new Plant)	Ottawa	0.89	12,558	KS0097535	Feb 2029	2
44	Spring Hill No. 2 (mechanical)	Spring Hill	0.79	8,547	KS0095516	Jul 2029	12
45	Frontenac Waste Water Treatment Plant C/o City Hall	Frontenac	0.75	3,259	KS0026131	Jun 2029	6
46	City Of Larned WWTF	Larned	0.68	4,164	KS0098752	Jun 2031	28
47	South Hutchinson Waste Water Treatment Plant	South Hutchinson	0.67	—	KS0095711	Mar 2028	193
48	Wellington, City Of	Wellington	0.67	8,209	KS0099571	Sep 2028	32
49	Eudora, City Of	Eudora	0.63	4,852	KS0094609	Dec 2026	29
50	Tonganoxie Wastewater Plant	Tonganoxie	0.62	3,912	KS0093092	Nov 2026	6

Treatment technology for each plant is shown with a free Klarifi account. Create one →

Largest plants 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 October 26, 2026.

Wastewater terms: WWTP · POTW · MGD · NPDES permit · Tertiary treatment · Significant industrial user · all terms

Cite this page

Journalists, researchers and educators are welcome to quote these figures. Please credit Klarifi as the source and link to this page.

Klarifi. “The 50 largest wastewater treatment plants in Kansas (2026).” Updated October 26, 2026. https://klarifi.io/facilities/kansas/largest

Need a custom cut of the data for a state, a county or a list of plants? Email info@klarifi.io.

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