What is the largest wastewater treatment plant in Virginia?

Richmond WWTP in Richmond, treating an average of 63.4 MGD under NPDES permit VAL063177. Noman M Cole Jr Pollution Control Plant in Lorton is second at 34.8 MGD.

How much wastewater do Virginia’s largest plants treat?

The 50 largest plants treat 191 MGD combined, 94% of the flow reported by all 223 publicly owned plants in 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 Virginia

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

Ranked by average flow · 191 MGD combined · 94% of the state's reported flow

Richmond WWTP in Richmond is the largest publicly owned wastewater treatment plant in Virginia by reported average flow, treating about 63.4 million gallons per day. The 50 plants below treat 191 MGD between them, 94% of the flow reported by all 223 plants in the state, and serve about 1,624,604 people. Every plant links to its profile with permit, technology and compliance data.

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

The 50 largest publicly owned wastewater treatment plants in 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	Richmond WWTP	Richmond	63.4	278,696	VAL063177	Dec 2030	Clarifiers, Biogas silos	31
2	Noman M Cole Jr Pollution Control Plant	Lorton	34.8	369,668	VAL025364	Dec 2030	Clarifiers, Aerated lagoons	0
3	Arlington County Water Pollution Control Plant	Arlington	20.7	268,149	VA0025143	Nov 2024	Clarifiers, Biogas silos, Biogas balloons	4
4	H L Mooney Water Reclamation Facility	Woodbridge	14.17	162,923	VA0025101	Oct 2030	Clarifiers, Aerated lagoons, Biogas silos, Biogas balloons	0
5	City Of Danville Northside WWTP	Danville	5.03	53,221	VAL060593	Dec 2030	Clarifiers, Uncovered lagoons	5
6	Martinsville STP	Ridgeway	4.11	33,046	VAL025305	Dec 2030	Clarifiers, Aerated lagoons	26
7	Front Royal WWTP	Front Royal	3.64	16,290	VA0062812	Oct 2028	Clarifiers	2
8	Peppers Ferry Regional Wastewater Treatment Plant	Radford	3.3	59,712	VAL062685	Dec 2030	Clarifiers, Biogas silos	0
9	Middle River Regional WWTP	Verona	3.03	51,001	VA0064793	Feb 2031	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	0
10	Culpeper Wastewater Treatment Plant	Culpeper	2.9	18,900	VAL061590	Dec 2030	Clarifiers, Aerated lagoons, Uncovered lagoons, Biogas silos	0
11	Christiansburg Town Of	Christiansburg	2.8	23,816	VAL061751	Dec 2030	Clarifiers, Aerated lagoons, Biogas silos	1
12	Fredericksburg Wastewater Treatment Facility	Fredericksburg	2.33	24,004	VAL025127	Dec 2030	Clarifiers, Aerated lagoons, Carrousels / oxidation ditches, Biogas silos	12
13	Fmc Wastewater Treatment Plant	Fredericksburg	2.02	45,641	VAL068110	Dec 2030	Clarifiers	2
14	Maple Ave WWTP	South Boston	2	8,900	VA0020362	Aug 2029	Clarifiers	42
15	Parkins Mills Wastewater Treat	Winchester	1.96	19,383	VAL075191	Dec 2030	Clarifiers, Carrousels / oxidation ditches	43
16	Richlands Regional WWTF	Richlands	1.91	11,125	VAL021199	Dec 2030	Clarifiers, Biogas silos	1
17	Big Stone Gap Regional WWTP	Big Stone Gap	1.71	10,716	VAL020940	Dec 2030	Clarifiers, Aerated lagoons, Uncovered lagoons, Carrousels / oxidation ditches	4
18	Altavista Town - Wastewater Treatment Plant	Altavista	1.7	4,645	VA0020451	May 2031	Clarifiers, Aerated lagoons, Uncovered lagoons	0
19	Wytheville WWTP	Wytheville	1.59	8,670	VA0020281	Apr 2029	Clarifiers, Biogas silos, Biogas balloons	94
20	Galax Wastewater Treatment Facility	Galax	1.47	6,798	VAL078484	Dec 2030	Clarifiers, Biogas silos	1
21	Town Of Luray	Luray	1.22	7,085	VA0062642	Mar 2031	Clarifiers, Carrousels / oxidation ditches	9
22	Lexington-Rockbridge Regional Wqcf	Lexington	0.96	18,264	VAL088161	Dec 2030	Carrousels / oxidation ditches	0
23	Wilderness Wastewater Treatment Plant	Locust Grove	0.87	12,876	VA0083411	Sep 2027	Clarifiers, Carrousels / oxidation ditches	2
24	Bedford Wastewater Treatment Plant	Bedford	0.8	7,746	VAL022390	Dec 2030	Clarifiers, Biogas balloons	10
25	Rocky Mount Town Sewage Treatment Plant	Rocky Mount	0.77	5,065	VAL085952	Dec 2030	Clarifiers, Carrousels / oxidation ditches	0
26	South Hill WWTP	South Hill	0.74	7,382	VA0069337	Aug 2028	Clarifiers, Carrousels / oxidation ditches	0
27	Lawrenceville STP	Lawrenceville	0.74	4,760	VA0020354	Aug 2030	Clarifiers, Aerated lagoons, Carrousels / oxidation ditches, Biogas silos	0
28	Orange Virginia Town Of Sewage	Orange	0.73	5,089	VAL021385	Dec 2030	Clarifiers, Uncovered lagoons	1
29	Emporia, City Of	Emporia	0.7	6,094	VAL020346	Dec 2030	—	0
30	Alleghany Co - Lower Jackson River Regional WWTP	Iron Gate	0.7	2,978	VA0090671	Nov 2030	Clarifiers	4
31	Remington Wastewater Treatment	Remington	0.68	6,912	VAL076805	Dec 2030	—	0
32	Strasburg STP	Strasburg	0.65	7,083	VA0020311	Apr 2028	Clarifiers, Carrousels / oxidation ditches	0
33	Blackstone Town	Blackstone	0.57	5,211	VA0025194	Aug 2030	—	4
34	Parham Landing WWTP	West Point	0.57	1,850	VA0088331	Sep 2030	Aerated lagoons, Carrousels / oxidation ditches	2
35	Caroline County Regional Sewage Treatment Plant	Ruther Glen	0.5	2,367	VA0073504	Apr 2029	Clarifiers, Carrousels / oxidation ditches	5
36	Woodstock STP	Woodstock	0.5	3,104	VA0026468	Feb 2031	Carrousels / oxidation ditches	26
37	Tazewell Wastewater Plant, Tow	Tazewell	0.48	8,100	VAL026298	Dec 2030	Clarifiers, Uncovered lagoons	0
38	Scott County Psa - Holston Regional WWTP	Weber City	0.47	3,484	VA0067351	Apr 2029	Clarifiers, Carrousels / oxidation ditches	0
39	Town Of Tappahannock Wastewater Treatment Plant	Tappahannock	0.42	1,233	VA0071471	May 2028	Clarifiers, Uncovered lagoons, Carrousels / oxidation ditches	0
40	Washington Cnty Service Authority -Hall Creek WWTP	Glade Spring	0.4	3,589	VA0087378	Jan 2023	Clarifiers, Carrousels / oxidation ditches	3
41	Pound WWTP	Pound	0.36	4,000	VA0061913	Apr 2029	Clarifiers	12
42	Hillsville WWTP	Hillsville	0.36	3,188	VA0089443	Oct 2030	Clarifiers, Carrousels / oxidation ditches	5
43	Round Hill Town Wastewater Treatment Plant	Round Hill	0.36	850	VA0026212	Aug 2028	—	42
44	St Paul Wastewater Treatment Plant	St Paul	0.33	3,341	VA0026221	Mar 2029	—	4
45	Three Creek WWTP	Emporia	0.33	2,546	VA0077259	Aug 2028	—	3
46	Berryville WWTP	Berryville	0.32	3,170	VA0020532	Dec 2029	—	0
47	Chilhowie Regional Wastewater Treatment Plant	Chilhowie	0.32	3,886	VA0026379	May 2026	Clarifiers, Carrousels / oxidation ditches	1
48	Mount Jackson WWTP	Mount Jackson	0.31	2,129	VA0026441	Dec 2026	—	2
49	Chatham Town - Sewage Treatmen	Chatham	0.31	2,327	VA0020524	Mar 2029	—	6
50	Pennington Gap STP	Pennington Gap	0.29	3,591	VA0029599	Aug 2030	Clarifiers, Carrousels / oxidation ditches	1

Largest plants in 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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