Lagoon systems: wastewater treatment plants in West Virginia
50 plants · 22% of the state · 25 MGD reported by 48 plants
Klarifi identifies 50 publicly owned wastewater treatment plants with lagoon systems in West Virginia, 22% of the 228 plants in the state (25 MGD reported by 48 plants). The largest is Huntington WWTP in Huntington at 10.72 MGD.
Lagoon systems treat wastewater in large earthen ponds over weeks of retention time, with or without mechanical aeration. They serve thousands of small towns because they are cheap to run, but they struggle with ammonia and nutrient limits, fill with sludge over decades and are the plants most often converted or upgraded when a permit is renewed.
The largest lagoons in West Virginia
| # | Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| 1 | Huntington WWTP | Huntington | 10.72 | WVL023159 | Dec 2030 | 72 |
| 2 | Weirton, City Of | Weirton | 3.77 | WVL023108 | Dec 2030 | 84 |
| 3 | Moorefield/hardy County Regional Wastewater | Moorefield | 2.79 | WV0106038 | May 2026 | 18 |
| 4 | Keyser City Of | Keyser | 1 | WV0024392 | Nov 2011 | 124 |
| 5 | City Of New Martinsville | New Martinsville | 0.87 | WVL027472 | Dec 2030 | 2 |
| 6 | Bradley Psd | Bradley | 0.57 | WV0025925 | Feb 2016 | 42 |
| 7 | Sanitary Board | Barboursville | 0.51 | WV0024481 | Dec 2012 | 81 |
| 8 | Mineral Wells Psd | Mineral Wells | 0.42 | WV0081141 | Sep 2013 | 15 |
| 9 | Greater Harrison Co. Psd | West Milford | 0.41 | WV0084301 | Oct 2029 | 29 |
| 10 | City Of Parsons | Parsons | 0.4 | WV0022063 | Jun 2011 | 57 |
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 West Virginia
Lagoon systems in other states
Lagoon systems 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 October 26, 2026.
Wastewater terms: WWTP · POTW · Biosolids · Oxidation ditch · Anaerobic digester · all terms