Oxidation ditches: wastewater treatment plants in Virginia
30 plants · 13% of the state · 20 MGD reported by 29 plants
Klarifi identifies 30 publicly owned wastewater treatment plants with oxidation ditches in Virginia, 13% of the 224 plants in the state (20 MGD reported by 29 plants). The largest is Middle River Regional WWTP in Verona at 2.99 MGD.
Oxidation ditches are ring-shaped activated sludge reactors with long retention times, common at plants between 0.5 and 10 MGD. They are recognisable from the air by their looped channels and rely on surface aerators or brush rotors, which are frequent replacement and energy-efficiency projects.
The largest oxidation ditch plants in Virginia
| # | Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| 1 | Middle River Regional WWTP | Verona | 2.99 | VA0064793 | Feb 2031 | 0 |
| 2 | Fredericksburg Wastewater Treatment Facility | Fredericksburg | 2.37 | VAL025127 | Dec 2030 | 12 |
| 3 | Parkins Mills Wastewater Treat | Winchester | 2.17 | VAL075191 | Dec 2030 | 43 |
| 4 | Big Stone Gap Regional WWTP | Big Stone Gap | 1.89 | VAL020940 | Dec 2030 | 7 |
| 5 | Town Of Luray | Luray | 1.17 | VA0062642 | Mar 2031 | 9 |
| 6 | Lexington-Rockbridge Regional Wqcf | Lexington | 0.91 | VAL088161 | Dec 2030 | 0 |
| 7 | Wilderness Wastewater Treatment Plant | Locust Grove | 0.87 | VA0083411 | Sep 2027 | 2 |
| 8 | Rocky Mount Town Sewage Treatment Plant | Rocky Mount | 0.81 | VAL085952 | Dec 2030 | 0 |
| 9 | South Hill WWTP | South Hill | 0.75 | VA0069337 | Aug 2028 | 0 |
| 10 | Lawrenceville STP | Lawrenceville | 0.74 | VA0020354 | Aug 2030 | 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
Oxidation ditches in other states
Oxidation ditches 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 October 26, 2026.
Wastewater terms: Oxidation ditch · Activated sludge · Biological nutrient removal · FOG · Equalization tank · all terms