NPDES permits in Pennsylvania
783 permits held by publicly owned wastewater treatment plants · issued by PA DEP
Effective
650
Administratively continued
30
Expired
102
Total tracked
783
Pennsylvania Department of Environmental Protection (PA DEP) runs the NPDES program in Pennsylvania under delegation from EPA Region 3, issuing and enforcing the discharge permits listed here. Klarifi tracks 783 permits held by publicly owned treatment plants in the state, with status, expiry, design flow and three-year compliance for each. Agency website →
An NPDES permit runs for five years. To keep discharging, a plant must apply for renewal at least 180 days before the expiry date, and the renewed permit usually arrives with tighter effluent limits, new monitoring requirements or a compliance schedule. That is why the year a permit expires is the year a plant starts budgeting for upgrades: nutrient removal, disinfection, capacity or controls.
Permit renewals by year
2029: 121 permits
2030: 234 permits
2031: 80 permits
Largest permit holders in Pennsylvania
| Facility | City | Avg flow (MGD) | Design (MGD) | NPDES permit | Status | Expires | Violations (3y) |
|---|---|---|---|---|---|---|---|
| Allegheny Cnty Sani Auth/allegheny Cnty | Pittsburgh | 152.8 | — | PAL025984 | Effective | Dec 2030 | 1 |
| Phila Water Dept - SE STP | Philadelphia | 77 | — | PAL026662 | Effective | Dec 2030 | 1 |
| Delcora-Western Regional Treatment Plant | Chester | 27.54 | 44 | PA0027103 | Expired | Mar 2026 | 18 |
| City Of Allentown Wastewater Treatment Plant | Allentown | 31.07 | 40 | PA0026000 | Terminated | Sep 2007 | 0 |
| City Of Bethlehem Wastewater Treatment Plant | Bethlehem | 9.97 | 40 | PA0026042 | Effective | May 2031 | 18 |
| City Of Erie, Pa - Wastewater Treatment Plant | Erie | 24.1 | — | PAL026301 | Effective | Dec 2030 | 1 |
| Reading STP | Reading | 14.09 | 20.5 | PA0026549 | Effective | Apr 2028 | 9 |
| Hanover Boro STP | Mcsherrystown | 3.65 | 17.6 | PA0026875 | Effective | Dec 2027 | 2 |
| Wyoming Valley Sani Auth Wilkes Barre | Wilkes Barre | 17.3 | — | PAL026107 | Effective | Dec 2030 | 1 |
| Lrbsa/ Clinton Twp Plant | Browndale | 0.2 | 15.7 | PA0027081 | Effective | Oct 2030 | 6 |
| Oaks WWTP (lower Perkiomen Valley) | Oaks | 5.54 | 14.25 | PA0026964 | Effective | Nov 2030 | 5 |
| Elizabethtown STP | Elizabethtown | 1.7 | 13.5 | PA0023108 | Effective | Apr 2027 | 8 |
| Lower Bucks WWTP | Levittown | 5.34 | 10 | PA0026468 | Effective | May 2028 | 25 |
| Lrbsa - Throop Plant | Throop | 5.7 | 10 | PA0027090 | Expired | Aug 2021 | 6 |
| Washington E Washington STP | Washington | 4.51 | 9.77 | PA0026212 | Effective | Jan 2031 | 174 |
| Norristown Muni STP | Norristown | 3.96 | 9.75 | PA0027421 | Effective | May 2029 | 2 |
| Uniontown STP | Uniontown | 4.2 | 9.4 | PA0027219 | Effective | Jul 2027 | 6 |
| Altoona Easterly STP | Altoona | 2.82 | 9 | PA0027014 | Effective | Sep 2026 | 5 |
| Shamokin-Coal Twp Jt Sew Auth | Shamokin | — | 9 | PA0027324 | Expired | Dec 2025 | 10 |
| Upper Allegheny Jt Sani Auth STP | Creighton | 4.3 | 9 | PA0027391 | Administratively continued | Aug 2015 | 0 |
| Log College STP | Warminster | 3.78 | 8.93 | PA0026166 | Administratively continued | Aug 2026 | 7 |
| Gr Hazleton Jt Sew Auth WWTP | Hazleton | 5.15 | 8.9 | PA0026921 | Effective | Feb 2027 | 6 |
| Bradford STP | Bradford | 2.4 | 8.8 | PA0026379 | Effective | Mar 2031 | 23 |
| Indiana Boro WWTP | Indiana | 3.43 | 8.2 | PA0026751 | Effective | Jun 2031 | 0 |
| Pottsville Main STP | Pottsville | 2.19 | 8.2 | PA0043885 | Effective | Apr 2031 | 23 |
All 783 plants in Pennsylvania →
NPDES permits 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.