Maryland wastewater permits expiring in 2026
12 NPDES permits · 2 MGD combined average flow
12 publicly owned wastewater treatment plants in Maryland hold NPDES permits that expire during 2026, issued by Maryland Department of the Environment. The table lists each plant with its permit number, expiry month, average flow, treatment technology and three-year violation count, in order of expiry.
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.
| Facility | City | Avg flow (MGD) | NPDES permit | Expires | Violations (3y) |
|---|---|---|---|---|---|
| Northern Garrett High School | Accident | 0.0039 | MD0024449 | Jan 2026 | 12 |
| Glen Arm Wastewater Treatment Plant (formerly Grumman Wwtp) | Glen Arm | — | MD0067903 | Jan 2026 | 22 |
| George'S Creek WWTP | Westernport | 1.03 | MD0060071 | May 2026 | 0 |
| Port Deposit WWTP | Port Deposit | 0.09 | MD0020796 | May 2026 | 32 |
| White Rock WWTP | Frederick | 0.0097 | MD0025089 | May 2026 | 0 |
| Middletown WWTP | Middletown | 0.16 | MD0024406 | Jul 2026 | 0 |
| Hebron WWTP | Hebron | 0.08 | MD0059617 | Jul 2026 | 32 |
| Crestview Estates WWTP | Frederick | 0.02 | MD0022683 | Jul 2026 | 5 |
| Chestertown WWTP | Chestertown | 0.6 | MD0020010 | Sep 2026 | 5 |
| Centreville WWTP | Centreville | 0.42 | MD0020834 | Nov 2026 | 12 |
| Accident WWTP | Accident | 0.1 | MD0051721 | Dec 2026 | 47 |
| Sudlersville WWTP | Sudlersville | — | MD0020559 | Dec 2026 | 9 |
Maryland permit renewals in 2026: 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: NPDES permit · POTW · Biological nutrient removal · Tertiary treatment · Lift station · Inflow and infiltration · all terms
Cite this page
Journalists, researchers and educators are welcome to quote these figures. Please credit Klarifi as the source and link to this page.
Klarifi. “NPDES permits expiring in 2026: Maryland wastewater plants.” Updated October 26, 2026. https://klarifi.io/facilities/maryland/permits-expiring/2026Need a custom cut of the data for a state, a county or a list of plants? Email info@klarifi.io.