Anaerobic digesters and biogas: wastewater treatment plants in Pennsylvania
94 plants · 12% of the state · 220 MGD reported by 92 plants
Klarifi identifies 94 publicly owned wastewater treatment plants with anaerobic digesters and biogas in Pennsylvania, 12% of the 783 plants in the state (220 MGD reported by 92 plants). The largest is City Of Allentown Wastewater Treatment Plant in Allentown at 31.07 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 | City Of Allentown Wastewater Treatment Plant | Allentown | 31.07 | PA0026000 | Sep 2007 | 0 |
| 2 | Reading STP | Reading | 14.09 | PA0026549 | Apr 2028 | 9 |
| 3 | City Of Bethlehem Wastewater Treatment Plant | Bethlehem | 9.97 | PA0026042 | May 2031 | 18 |
| 4 | Springettsbury Wastewater Treatment Plant | York | 7.61 | PAL026808 | Dec 2030 | 4 |
| 5 | Lrbsa - Throop Plant | Throop | 5.7 | PA0027090 | Aug 2021 | 6 |
| 6 | Oaks WWTP (lower Perkiomen Valley) | Oaks | 5.54 | PA0026964 | Nov 2030 | 5 |
| 7 | Lower Bucks WWTP | Levittown | 5.34 | PA0026468 | May 2028 | 25 |
| 8 | Lebanon City STP | Lebanon | 5.22 | PAL027316 | Dec 2030 | 1 |
| 9 | Chambersburg Boro STP | Chambersburg | 5.16 | PAL026051 | Dec 2030 | 0 |
| 10 | Gr Hazleton Jt Sew Auth WWTP | Hazleton | 5.15 | PA0026921 | Feb 2027 | 6 |
| 11 | Valley Forge Sewer Authority WWTP | Phoenixville | 4.66 | PAL043974 | Dec 2030 | 8 |
| 12 | Washington E Washington STP | Washington | 4.51 | PA0026212 | Jan 2031 | 174 |
| 13 | Lower Allen Twp STP | New Cumberland | 4.33 | PAL027189 | Dec 2030 | 0 |
| 14 | Uniontown STP | Uniontown | 4.2 | PA0027219 | Jul 2027 | 6 |
| 15 | Norristown Muni STP | Norristown | 3.96 | PA0027421 | May 2029 | 2 |
| 16 | Log College STP | Warminster | 3.78 | PA0026166 | Aug 2026 | 7 |
| 17 | Upper Moreland Hatboro Jt Sew Auth/willow Grove | Willow Grove | 3.68 | PAL025976 | Dec 2030 | 20 |
| 18 | Hanover Boro STP | Mcsherrystown | 3.65 | PA0026875 | Dec 2027 | 2 |
| 19 | E Norriton Plymouth /norristown | Plymouth Meeting | 3.6 | PAL026816 | Dec 2030 | 7 |
| 20 | Indiana Boro WWTP | Indiana | 3.43 | PA0026751 | Jun 2031 | 0 |
| 21 | Clairton Mun Auth STP | Clairton | 3.42 | PAL026824 | Dec 2030 | 19 |
| 22 | Piney Fork STP | Pittsburgh | 3.22 | PA0027618 | Jun 2028 | 15 |
| 23 | New Stanton WPCP | Hunker | 3.14 | PA0038181 | Nov 2029 | 6 |
| 24 | West Goshen Township WWTP | West Chester | 3.12 | PAL028584 | Dec 2030 | 2 |
| 25 | Williamsport Sanitary Authority - Central Plant | Williamsport | 3.06 | PAL027057 | Dec 2030 | 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 September 11, 2026.