What is the largest wastewater treatment plant in Kansas?

Kansas City Water Pollution Control Div. in Kansas City, treating an average of 15.44 MGD under NPDES permit KS0038563. Joco Tomahawk Creek in Leawood is second at 12.13 MGD.

How much wastewater do Kansas’s largest plants treat?

The 50 largest plants treat 144 MGD combined, 92% of the flow reported by all 354 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 · 144 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 15.44 million gallons per day. The 50 plants below treat 144 MGD between them, 92% of the flow reported by all 354 plants in the state, and serve about 1,248,851 people. Every plant links to its profile with permit, technology and compliance data.

All plants in Kansas →The 100 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, treatment technology and three-year violation count.
#	Facility	City	Avg flow (MGD)	Population	NPDES permit	Expires	Technology	Violations (3y)
1	Kansas City Water Pollution Control Div.	Kansas City	15.44	131,272	KS0038563	May 2030	Clarifiers, Biogas silos, Biogas balloons	0
2	Joco Tomahawk Creek	Leawood	12.13	43,021	KS0100854	Apr 2031	Clarifiers, Biogas silos, Biogas balloons	1
3	Topeka Oakland Wastewater Plant	Topeka	10.55	82,311	KS0042722	Jan 2027	Carrousels / oxidation ditches, Biogas silos, Biogas balloons	63
4	Joco Douglas Smith Mid Basin	Overland Park	10.2	126,584	KS0119601	Feb 2027	Aerated lagoons, Biogas silos, Biogas balloons	0
5	Joco Mill Creek Regional Wtf	Shawnee	9.47	80,102	KS0088269	Jan 2030	Clarifiers, Aerated lagoons, Uncovered lagoons	0
6	Joco Nelson Complex Wastewater Plant	Mission	7.21	104,169	KS0055492	Jan 2030	Clarifiers, Biogas silos, Biogas balloons	50
7	Lawrence, City Of	Lawrence	6.02	54,351	KS0038644	Jul 2029	Clarifiers, Uncovered lagoons, Biogas silos, Biogas balloons	14
8	Joco Blue River District #1	Stanley	5.14	34,065	KS0092738	Dec 2027	Clarifiers, Aerated lagoons, Biogas balloons	0
9	Emporia Wastewater Treatment Plant	Emporia	4.23	24,587	KS0046728	Apr 2028	Clarifiers, Biogas silos	27
10	Salina, City Of	Salina	3.98	50,449	KS0038474	Dec 2029	Clarifiers, Biogas silos	5
11	Hutchinson, City Of	Hutchinson	3.74	41,940	KS0036188	Dec 2028	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches, Biogas silos	16
12	Olathe (cedar Creek) Wastewater Plant	Olathe	3.74	25,518	KS0081299	Dec 2029	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	0
13	City Of Coffeyville WTP	Coffeyville	3.25	9,890	KS0050733	Dec 2026	Uncovered lagoons	22
14	Leavenworth, City Of	Leavenworth	3.18	33,527	KS0036366	Feb 2028	Clarifiers, Biogas balloons	11
15	Pittsburg City Of Mun WWTP	Pittsburg	2.7	19,968	KS0200022	Jun 2028	Clarifiers, Biogas silos	68
16	Kansas City (plant No.20) WWTP	Kansas City	2.64	27,272	KS0080195	Dec 2026	Clarifiers	74
17	Wichita - Four Mile Creek - New	Wichita	2.41	10,376	KS0100790	Dec 2026	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	10
18	Garden City, City Of	Garden City	2.38	27,914	KS0038962	Dec 2026	Clarifiers, Carrousels / oxidation ditches	3
19	Derby Wastewater Treatment	Derby	2.19	17,546	KS0050377	Dec 2027	Clarifiers, Carrousels / oxidation ditches	61
20	Hays, City Of - Chetolah Creek Water Re	Hays	2.04	18,317	KS0100820	Dec 2030	Clarifiers, Carrousels / oxidation ditches	0
21	Lawrence, City Of (wakarusa)	Lawrence	1.94	35,952	KS0099031	Aug 2029	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	0
22	Winfield, City Of	Winfield	1.87	10,357	KS0051926	Nov 2030	Clarifiers, Carrousels / oxidation ditches, Biogas silos	49
23	Junction City Wastewater Department	Junction City	1.84	13,582	KS0034011	Dec 2026	Clarifiers, Aerated lagoons, Uncovered lagoons, Biogas silos	44
24	Gardner - Kill Creek	Gardner	1.83	20,208	KS0095605	Oct 2026	Clarifiers, Carrousels / oxidation ditches	79
25	Arkansas City Mwwtp	Arkansas City	1.61	11,402	KS0044831	Feb 2028	Clarifiers, Biogas silos	12
26	Chanute, City Of	Chanute	1.47	9,018	KS0080837	Jan 2028	Clarifiers, Uncovered lagoons, Biogas silos	1
27	Chisholm Creek Utility Authority	Park City	1.4	13,609	KS0089176	Nov 2027	Clarifiers	89
28	Liberal Mechanical Plant (new)	Liberal	1.36	—	KS0100986	Jun 2029	Clarifiers, Covered lagoons, Uncovered lagoons, Biogas silos	39
29	Olathe Harold (main Plant)	Olathe	1.3	32,213	KS0045802	Jun 2028	Clarifiers, Biogas silos	5
30	Wolcott Wastewater Treatment Facility	Kansas City	1.23	—	KS0101516	May 2029	Uncovered lagoons	6
31	Great Bend, City Of	Great Bend	1.08	15,366	KS0038491	Dec 2026	Clarifiers, Carrousels / oxidation ditches, Biogas silos	0
32	Independence, City Of	Independence	1.07	9,787	KS0095486	Dec 2026	Aerated lagoons, Uncovered lagoons	4
33	Fort Scott, City Of (new Plant)	Fort Scott	1.03	8,928	KS0095923	Oct 2028	Clarifiers, Aerated lagoons, Carrousels / oxidation ditches	35
34	Augusta WWTP	Augusta	0.99	9,300	KS0094561	Sep 2027	Biogas balloons	41
35	Wichita #3 Wastewater Plant	Wichita	0.98	4,160	KS0095681	Oct 2027	Clarifiers, Carrousels / oxidation ditches, Biogas balloons	5
36	Wellington, City Of	Wellington	0.89	8,209	KS0099571	Sep 2028	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	32
37	Sherwood Reg WWTP	Topeka	0.85	15,321	KS0117731	Jun 2030	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	4
38	Basehor, City Of	Basehor	0.78	5,981	KS0094382	Aug 2027	Clarifiers, Carrousels / oxidation ditches	3
39	South Hutchinson Waste Water Treatment Plant	South Hutchinson	0.77	—	KS0095711	Mar 2028	Clarifiers	188
40	City Of Larned WWTF	Larned	0.75	4,164	KS0098752	Jun 2031	—	28
41	Junction City - Southwest Wastewater Pt	Junction City	0.74	2,054	KS0092151	Aug 2029	Uncovered lagoons	58
42	Atchison, City Of	Atchison	0.72	9,367	KS0039128	Dec 2028	—	7
43	Colby, City Of	Colby	0.71	4,682	KS0098698	Sep 2027	—	9
44	Kingman, City Of	Kingman	0.7	2,784	KS0095982	Oct 2027	Clarifiers, Aerated lagoons, Uncovered lagoons, Carrousels / oxidation ditches	5
45	Paola, City Of	Paola	0.64	5,484	KS0097616	Dec 2029	Uncovered lagoons	1
46	Spring Hill No. 2 (mechanical)	Spring Hill	0.64	8,547	KS0095516	Jul 2029	—	12
47	Baxter Springs WWTP	Baxter Springs	0.62	4,522	KS0045934	May 2028	Aerated lagoons, Uncovered lagoons	9
48	Parsons WWTP	Parsons	0.62	11,310	KS0097560	Sep 2028	Uncovered lagoons, Biogas balloons	4
49	Frontenac Waste Water Treatment Plant C/o City Hall	Frontenac	0.61	3,259	KS0026131	Jun 2029	Uncovered lagoons	6
50	City Of Pratt WTP	Pratt	0.58	6,106	KS0049751	Oct 2027	Clarifiers, Biogas silos	2

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 September 11, 2026.

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