What is the largest wastewater treatment plant in Kentucky?

Msd, Morris Forman Plant in Louisville, treating an average of 56.18 MGD under NPDES permit KY0022411. Derek R Guthrie WQTC MSD in Louisville is second at 39.73 MGD.

How much wastewater do Kentucky’s largest plants treat?

The 50 largest plants treat 167 MGD combined, 91% of the flow reported by all 193 publicly owned plants in Kentucky.

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 Kentucky

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

Ranked by average flow · 167 MGD combined · 91% of the state's reported flow

Msd, Morris Forman Plant in Louisville is the largest publicly owned wastewater treatment plant in Kentucky by reported average flow, treating about 56.18 million gallons per day. The 50 plants below treat 167 MGD between them, 91% of the flow reported by all 193 plants in the state, and serve about 1,259,942 people. Every plant links to its profile with permit, technology and compliance data.

All plants in Kentucky →The 100 largest US plants →Kentucky NPDES permits →

The 50 largest publicly owned wastewater treatment plants in Kentucky 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	Msd, Morris Forman Plant	Louisville	56.18	569,690	KY0022411	Sep 2004	Clarifiers, Uncovered lagoons, Biogas balloons	221
2	Derek R Guthrie WQTC MSD	Louisville	39.73	109,588	KY0078956	Apr 2031	Clarifiers	16
3	Rwra Max Rhoads WWTP	Owensboro	6.56	43,157	KY0020095	Dec 2021	Clarifiers, Carrousels / oxidation ditches	1
4	Valley Creek Wastewater Treatment Plant	Elizabethtown	5.3	30,361	KY0022039	Oct 2023	Clarifiers, Carrousels / oxidation ditches	1
5	Richmond Otter Creek STP	Richmond	4.57	49,761	KY0107107	Dec 2030	Clarifiers, Carrousels / oxidation ditches	4
6	Strodes Creek STP	Winchester	3.18	19,276	KY0037991	Sep 2026	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	2
7	London STP	London	3.02	22,319	KY0021270	May 2030	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	20
8	Henderson South STP #2	Robards	2.89	3,188	KY0100293	Jun 2012	Clarifiers, Uncovered lagoons, Biogas silos, Biogas balloons	0
9	Bee Creek WWTP	Murray	2.83	18,935	KY0072761	Sep 2028	Clarifiers, Carrousels / oxidation ditches	2
10	Hopkinsville Hammond Wood STP	Hopkinsville	2.67	33,426	KY0066532	Sep 2030	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	2
11	Waste Water Treatment	Corbin	2.5	19,507	KY0020133	Jan 2031	Clarifiers, Aerated lagoons, Carrousels / oxidation ditches	26
12	Berea Municipal Utilities WWTP	Berea	2.23	14,666	KY0079898	Nov 2030	Clarifiers, Carrousels / oxidation ditches	0
13	Middlesboro STP	Middlesboro	1.94	10,756	KY0072885	Oct 2030	—	0
14	Morehead WWTP	Morehead	1.87	16,051	KY0052752	Dec 2030	Clarifiers, Biogas silos	0
15	Radcliff STP	Radcliff	1.86	23,001	KY0022390	Nov 2029	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	1
16	Fort Knox WWTP	Fort Knox	1.64	24,015	KY0112721	Sep 2030	Clarifiers, Carrousels / oxidation ditches	2
17	Greenup County Environmental Commission Wastewater Treatment Plant	Russell	1.63	39,869	KY0048348	May 2030	Clarifiers, Aerated lagoons, Uncovered lagoons, Carrousels / oxidation ditches	0
18	Mount Sterling Hinkston Creek STP	Mt Sterling	1.62	13,115	KY0104400	Dec 2027	Clarifiers, Carrousels / oxidation ditches	14
19	Hazard, City Of	Hazard	1.48	8,820	KY0020079	Aug 2030	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	8
20	Harrodsburg WWTP Expansion	Harrodsburg	1.39	8,802	KY0027421	Dec 2027	Clarifiers, Aerated lagoons, Uncovered lagoons, Carrousels / oxidation ditches	75
21	Paris STP	Paris	1.37	10,698	KY0090654	Mar 2030	Clarifiers, Carrousels / oxidation ditches	6
22	Carrollton Regional WWTP	Carrollton	1.18	8,811	KY0104931	Mar 2027	Clarifiers, Aerated lagoons	0
23	Leitchfield STP	Leitchfield	1.04	5,876	KY0022934	Nov 2030	Clarifiers, Aerated lagoons	1
24	Greenup Joint Sewer Agency	Wurtland	0.95	2,384	KY0033553	Jul 2030	—	2
25	Harlan STP	Harlan	0.94	6,137	KY0026093	Jun 2031	—	7
26	Cynthiana STP (new)	Cynthiana	0.93	6,845	KY0105856	Jun 2026	Clarifiers, Carrousels / oxidation ditches	1
27	Mount Washington STP	Mt Washington	0.91	19,466	KY0033804	Nov 2030	Clarifiers, Carrousels / oxidation ditches	0
28	Greenville STP	Greenville	0.86	6,102	KY0020010	Mar 2030	Clarifiers, Uncovered lagoons	29
29	La Grange STP	La Grange	0.85	10,110	KY0020001	Nov 2027	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	5
30	Tompkinsville STP	Tompkinsville	0.82	2,329	KY0020702	Mar 2027	Clarifiers	125
31	Winchester Municipal Utilities	Winchester	0.74	6,938	KY0108740	Jan 2031	Clarifiers, Carrousels / oxidation ditches	1
32	Paintsville Municipal Water Works-Paintsville WTP	Paintsville	0.72	4,980	KY0020630	Nov 2030	Clarifiers, Carrousels / oxidation ditches	2
33	Caveland Environmental Auth	Horse Cave	0.72	8,516	KY0091561	Mar 2027	Clarifiers, Carrousels / oxidation ditches, Cooling towers	6
34	Ky State Reformatory	La Grange	0.71	1,600	KY0040126	Nov 2022	—	45
35	Walton STP	Walton	0.68	3,510	KY0039756	Nov 2029	Clarifiers	1
36	Williamstown/dry Ridge WRF	Williamstown	0.67	5,810	KY0109991	Dec 2030	—	13
37	Springfield STP	Springfield	0.65	2,872	KY0020907	Sep 2030	Clarifiers	25
38	Prestonsburg STP	Prestonsburg	0.63	8,187	KY0027413	Aug 2031	Uncovered lagoons	2
39	Oak Grove, City Of	Oak Grove	0.59	7,716	KY0094056	Dec 2026	Clarifiers, Carrousels / oxidation ditches	6
40	Irvine STP	Irvine	0.58	4,527	KY0025909	Feb 2031	Clarifiers, Carrousels / oxidation ditches	48
41	Morganfield WWTP	Morganfield	0.54	5,601	KY0021440	May 2031	Uncovered lagoons	27
42	Benton STP	Benton	0.53	5,068	KY0021172	Sep 2029	Aerated lagoons, Uncovered lagoons	7
43	Liberty STP	Liberty	0.53	2,227	KY0026352	Sep 2030	Clarifiers, Carrousels / oxidation ditches	33
44	Red River WWTP	Stanton	0.53	8,606	KY0034428	Feb 2031	Clarifiers	6
45	Mccreary County STP	Stearns	0.53	6,255	KY0097837	Nov 2029	Clarifiers, Carrousels / oxidation ditches	3
46	Columbia/adair County STP	Columbia	0.51	4,085	KY0024317	Apr 2031	Clarifiers, Carrousels / oxidation ditches	2
47	Eddyville STP	Eddyville	0.49	2,682	KY0027979	Oct 2030	Clarifiers, Uncovered lagoons	113
48	Vine Grove STP	Vine Grove	0.47	4,520	KY0024988	Aug 2031	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	21
49	Jackson STP	Jackson	0.45	2,966	KY0021288	Apr 2030	Clarifiers, Carrousels / oxidation ditches	26
50	Pineville STP	Pineville	0.44	6,215	KY0024058	Feb 2027	Uncovered lagoons	73

Largest plants in Kentucky: 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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