Anaerobic digesters and biogas: wastewater treatment plants in Pennsylvania
93 plants · 12% of the state · 600 MGD reported by 91 plants
Klarifi identifies 93 publicly owned wastewater treatment plants with anaerobic digesters and biogas in Pennsylvania, 12% of the 790 plants in the state (600 MGD reported by 91 plants). The largest is Philadelphia Southwest POTW in Philadelphia at 182.78 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 Pennsylvania
| # | Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|---|
| 1 | Philadelphia Southwest POTW | Philadelphia | 182.78 | PAL026671 | Dec 2030 | 36 |
| 2 | Northeast WPCP | Philadelphia | 153.22 | PAL026689 | Dec 2030 | 0 |
| 3 | City Of Allentown Wastewater Treatment Plant | Allentown | 31.66 | PA0026000 | Sep 2007 | 0 |
| 4 | Reading STP | Reading | 14.02 | PA0026549 | Apr 2028 | 9 |
| 5 | City Of Bethlehem Wastewater Treatment Plant | Bethlehem | 10.23 | PA0026042 | May 2031 | 18 |
| 6 | Springettsbury Wastewater Treatment Plant | York | 9.09 | PAL026808 | Dec 2030 | 4 |
| 7 | Gr Hazleton Jt Sew Auth WWTP | Hazleton | 6.71 | PA0026921 | Feb 2027 | 6 |
| 8 | Oaks WWTP (lower Perkiomen Valley) | Oaks | 6.7 | PA0026964 | Nov 2030 | 5 |
| 9 | Washington E Washington STP | Washington | 6.15 | PA0026212 | Jan 2031 | 169 |
| 10 | Uniontown STP | Uniontown | 6.09 | PA0027219 | Jul 2027 | 6 |
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 Pennsylvania
Anaerobic digesters and biogas in other states
Anaerobic digesters and biogas in Pennsylvania: 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 · Tertiary treatment · Significant industrial user · all terms