What is the largest wastewater treatment plant in West Virginia?

Huntington WWTP in Huntington, treating an average of 9.5 MGD under NPDES permit WVL023159. The Sanitary Board Of The City Of Charleston, West Virginia in Charleston is second at 6.28 MGD.

How much wastewater do West Virginia’s largest plants treat?

The 50 largest plants treat 75 MGD combined, 84% of the flow reported by all 232 publicly owned plants in West Virginia.

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 West Virginia

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

Ranked by average flow · 75 MGD combined · 84% of the state's reported flow

Huntington WWTP in Huntington is the largest publicly owned wastewater treatment plant in West Virginia by reported average flow, treating about 9.5 million gallons per day. The 50 plants below treat 75 MGD between them, 84% of the flow reported by all 232 plants in the state, and serve about 596,634 people. Every plant links to its profile with permit, technology and compliance data.

All plants in West Virginia →The 100 largest US plants →West Virginia NPDES permits →

The 50 largest publicly owned wastewater treatment plants in West Virginia 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	Huntington WWTP	Huntington	9.5	68,209	WVL023159	Dec 2030	Uncovered lagoons	72
2	The Sanitary Board Of The City Of Charleston, West Virginia	Charleston	6.28	57,912	WVL023205	Dec 2030	Clarifiers, Biogas silos	6
3	City Of Wheeling - Water Pollution Control Division	Wheeling	4.8	42,483	WV0023230	Jun 2010	Clarifiers, Biogas silos	130
4	Fairmont Wastewater Treatment Plant	Fairmont	4.4	35,181	WVL023353	Dec 2030	Clarifiers, Biogas silos	52
5	Parkersburg Utility Board	Parkersburg	4.25	46,509	WVL023213	Dec 2030	Clarifiers, Biogas silos	3
6	South Charleston Wwtw	South Charleston	4	13,100	WV0023116	Jan 2012	Clarifiers	27
7	Clarksburg Sanitary Bd	Clarksburg	3.99	34,675	WV0023302	Apr 2015	—	592
8	Princeton, City Of	Princeton	2.9	29,054	WVL023094	Dec 2030	Clarifiers, Biogas silos	21
9	Moorefield/hardy County Regional Wastewater	Moorefield	2.79	—	WV0106038	Jun 2021	Clarifiers, Aerated lagoons, Carrousels / oxidation ditches	18
10	Weirton, City Of	Weirton	2.41	20,841	WVL023108	Dec 2030	Clarifiers, Uncovered lagoons	84
11	Hurricane City Of	Hurricane	2.2	21,158	WVR030010	Sep 2030	Clarifiers	75
12	Richwood City Of	Richwood	1.4	2,381	WV0022004	Mar 2013	—	197
13	Oh/ Inw/ Bh/ NE 001-004	Martinsburg	1.39	3,861	WV0082759	Jun 2008	Uncovered lagoons	471
14	Bridgeport Wastewater Treatment Plant	Bridgeport	1.34	6,618	WV0025461	Jun 2010	Clarifiers, Carrousels / oxidation ditches	93
15	Martinsburg City Of WWTP	Martinsburg	1.28	15,823	WV0023167	Dec 2012	Clarifiers, Biogas silos	59
16	Rocky Fork Wastewater Plant	Cross Lanes	1.13	4,300	WVL037486	Dec 2030	—	15
17	City Of Ronceverte	Ronceverte	1.1	9,836	WV0024236	Mar 2014	Clarifiers	199
18	City Of St. Albans	Saint Albans	1.03	18,348	WVL023175	Dec 2030	Clarifiers	1
19	North Beckley Psd	Beckley	0.99	9,388	WV0027740	Mar 2009	—	112
20	Nitro WWTP	Nitro	0.99	12,842	WVL023299	Dec 2030	—	338
21	Sanitary Board	Barboursville	0.89	2,863	WV0024481	Dec 2012	Clarifiers	82
22	Grafton City Of	Grafton	0.83	4,875	WVL021822	Dec 2030	Clarifiers	90
23	Pea Ridge Public Svc	Barboursville	0.8	1,121	WV0027413	Jun 2013	Clarifiers	79
24	Shady Spring Psd	Beaver	0.76	9,214	WV0080403	Jun 2009	Clarifiers	51
25	Salt Rock Sewer Psd	Ona	0.75	9,410	WV0084450	Apr 2013	Carrousels / oxidation ditches	31
26	Ravencliff-Mcgraws-Saulsville Psd	Mcgraws	0.72	—	WVG640056	Jul 2028	—	0
27	Malden Public Service District	Charleston	0.68	7,720	WVL050610	Dec 2030	Clarifiers, Biogas silos	0
28	Weston City Of	Weston	0.68	6,264	WV0028088	Jun 2015	—	252
29	Welch City Of	Welch	0.67	3,590	WVL024589	Dec 2030	Clarifiers, Carrousels / oxidation ditches	197
30	Buckhannon Sewer Plant	Buckhannon	0.63	14,148	WV0032336	May 2012	Clarifiers, Carrousels / oxidation ditches	61
31	Philippi City Of	Philippi	0.63	2,935	WV0021857	Jun 2017	Clarifiers, Carrousels / oxidation ditches	32
32	City Of New Martinsville	New Martinsville	0.63	5,366	WVL027472	Dec 2030	Clarifiers, Carrousels / oxidation ditches	2
33	Green Valley-Glenwood Psd	Princeton	0.62	6,696	WVL082627	Dec 2030	Clarifiers, Carrousels / oxidation ditches	15
34	Glenville Utility Water Treatment Plant	Glenville	0.61	—	WVG640002	Jul 2028	—	60
35	Keyser City Of	Keyser	0.61	225	WV0024392	Nov 2011	Aerated lagoons	124
36	Elk-Pinch Public Servic Distri	Elkview	0.57	10,424	WVL080900	Dec 2030	Clarifiers	2
37	Oak Hill, City Of	Oak Hill	0.52	250	WV0020281	May 2014	—	250
38	Ripley WWTP	Ripley	0.52	3,177	WV0045543	Apr 2008	—	27
39	City Of Glenville	Glenville	0.51	1,450	WV0040401	Feb 2014	—	17
40	Kanawha Falls Psd	Deepwater	0.51	9,808	WVL034991	Dec 2030	—	705
41	Crab Orchard/macarthur Psd	Macarthur	0.49	303	WVL082309	Dec 2030	Clarifiers, Carrousels / oxidation ditches	9
42	Kanawha Public Service District	Chelyan	0.49	18,379	WV0038776	Nov 2010	Clarifiers	24
43	Summersville, City Of	Summersville	0.47	3,000	WV0020630	May 2013	Clarifiers	8
44	Frankfort Public Service District	Patterson Creek	0.44	7,098	WV0105988	May 2027	—	7
45	Shinnston City Of WWTP	Shinnston	0.38	2,453	WV0054500	Mar 2010	Clarifiers, Carrousels / oxidation ditches	69
46	City Of Petersburg	Petersburg	0.38	3,240	WV0021792	Feb 2016	Carrousels / oxidation ditches	75
47	City Of Spencer	Spencer	0.37	1,539	WV0020095	Jan 2009	Clarifiers	180
48	Warm Springs Psd	Berkeley Springs	0.35	434	WV0027707	Mar 2013	—	17
49	Mineral Wells Psd	Mineral Wells	0.35	3,678	WV0081141	Sep 2013	Aerated lagoons, Uncovered lagoons	14
50	Bradley Psd	Bradley	0.34	4,455	WV0025925	Feb 2016	Clarifiers, Aerated lagoons, Uncovered lagoons	45

Largest plants in West Virginia: 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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