Anaerobic digesters and biogas: wastewater treatment plants in North Carolina
15 plants · 18% of the state · 78 MGD reported by 7 plants
Klarifi identifies 15 publicly owned wastewater treatment plants with anaerobic digesters and biogas in North Carolina, 18% of the 83 plants in the state (78 MGD reported by 7 plants). The largest is Neuse River Resource Recovery Facility in Raleigh at 47.05 MGD.
Anaerobic digesters stabilise sludge in sealed heated tanks and produce biogas, visible from the air as digester silos and gas holders. Plants with digesters are typically above 5 MGD and are the buyers of mixing, heating, gas handling, cogeneration and dewatering equipment.
The largest plants with anaerobic digesters in North Carolina
| # | Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| 1 | Neuse River Resource Recovery Facility | Raleigh | 47.05 | NC0029033 | Feb 2025 | 1 |
| 2 | Irwin Creek Wastewater Treatment Plant | Charlotte | 10.55 | NC0024945 | Oct 2028 | 0 |
| 3 | North Durham WRF | Durham | 8.9 | NC0023841 | Jan 2029 | 4 |
| 4 | Mason Farm WWTP | Chapel Hill | 4.86 | NC0025241 | Jul 2030 | 0 |
| 5 | Central Johnston County WWTP | Smithfield | 2.91 | NC0030716 | Mar 2026 | 2 |
| 6 | City Of High Point | Thomasville | 2.5 | NC0024228 | Feb 2031 | 0 |
| 7 | Oxford WWTP | Oxford | 0.9 | NC0025054 | Sep 2030 | 2 |
| 8 | Anson County Regional WWTP | Wadesboro | — | NC0041408 | Feb 2029 | 8 |
| 9 | Lincolnton WWTP | Lincolnton | — | NC0025496 | Jul 2026 | 3 |
| 10 | M'Kean Maffitt Wastewater Treatment Plant | Wilmington | — | NC0023973 | Nov 2026 | 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 North Carolina
Anaerobic digesters and biogas in other states
Anaerobic digesters and biogas in North Carolina: 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: Anaerobic digester · Biosolids · Sludge dewatering · Centrate · Activated sludge · Oxidation ditch · all terms