Activated sludge and clarifiers: wastewater treatment plants in Virginia
72 plants · 32% of the state · 190 MGD reported by 70 plants
Klarifi identifies 72 publicly owned wastewater treatment plants with activated sludge and clarifiers in Virginia, 32% of the 223 plants in the state (190 MGD reported by 70 plants). The largest is Richmond WWTP in Richmond at 63.4 MGD.
Activated sludge is the standard mechanical process for cities: aeration basins where bacteria consume organic matter, followed by clarifiers that settle the biomass out. These plants are identified by their circular or rectangular clarifiers and by the suspended-growth process code, and they are the main market for blowers, diffusers, clarifier mechanisms and instrumentation.
The largest activated sludge plants in Virginia
| # | Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| 1 | Richmond WWTP | Richmond | 63.4 | VAL063177 | Dec 2030 | 31 |
| 2 | Noman M Cole Jr Pollution Control Plant | Lorton | 34.8 | VAL025364 | Dec 2030 | 0 |
| 3 | Arlington County Water Pollution Control Plant | Arlington | 20.7 | VA0025143 | Nov 2024 | 4 |
| 4 | H L Mooney Water Reclamation Facility | Woodbridge | 14.17 | VA0025101 | Oct 2030 | 0 |
| 5 | City Of Danville Northside WWTP | Danville | 5.03 | VAL060593 | Dec 2030 | 5 |
| 6 | Martinsville STP | Ridgeway | 4.11 | VAL025305 | Dec 2030 | 26 |
| 7 | Front Royal WWTP | Front Royal | 3.64 | VA0062812 | Oct 2028 | 2 |
| 8 | Peppers Ferry Regional Wastewater Treatment Plant | Radford | 3.3 | VAL062685 | Dec 2030 | 0 |
| 9 | Middle River Regional WWTP | Verona | 3.03 | VA0064793 | Feb 2031 | 0 |
| 10 | Culpeper Wastewater Treatment Plant | Culpeper | 2.9 | VAL061590 | Dec 2030 | 0 |
| 11 | Christiansburg Town Of | Christiansburg | 2.8 | VAL061751 | Dec 2030 | 1 |
| 12 | Fredericksburg Wastewater Treatment Facility | Fredericksburg | 2.33 | VAL025127 | Dec 2030 | 12 |
| 13 | Fmc Wastewater Treatment Plant | Fredericksburg | 2.02 | VAL068110 | Dec 2030 | 2 |
| 14 | Maple Ave WWTP | South Boston | 2 | VA0020362 | Aug 2029 | 42 |
| 15 | Parkins Mills Wastewater Treat | Winchester | 1.96 | VAL075191 | Dec 2030 | 43 |
| 16 | Richlands Regional WWTF | Richlands | 1.91 | VAL021199 | Dec 2030 | 1 |
| 17 | Big Stone Gap Regional WWTP | Big Stone Gap | 1.71 | VAL020940 | Dec 2030 | 4 |
| 18 | Altavista Town - Wastewater Treatment Plant | Altavista | 1.7 | VA0020451 | May 2031 | 0 |
| 19 | Wytheville WWTP | Wytheville | 1.59 | VA0020281 | Apr 2029 | 94 |
| 20 | Galax Wastewater Treatment Facility | Galax | 1.47 | VAL078484 | Dec 2030 | 1 |
| 21 | Town Of Luray | Luray | 1.22 | VA0062642 | Mar 2031 | 9 |
| 22 | Wilderness Wastewater Treatment Plant | Locust Grove | 0.87 | VA0083411 | Sep 2027 | 2 |
| 23 | Bedford Wastewater Treatment Plant | Bedford | 0.8 | VAL022390 | Dec 2030 | 10 |
| 24 | Rocky Mount Town Sewage Treatment Plant | Rocky Mount | 0.77 | VAL085952 | Dec 2030 | 0 |
| 25 | South Hill WWTP | South Hill | 0.74 | VA0069337 | Aug 2028 | 0 |
Contacts and project signals for every plant on this list
Klarifi adds verified decision-maker contacts, permit limits, discharge monitoring data and the capital projects planned in each city, filterable by technology, size and compliance record.
Other technologies in Virginia
Activated sludge and clarifiers in other states
Activated sludge and clarifiers 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.