Clean Water Act discharge permit · NPDES MD0021601
PATAPSCO WWTP, Baltimore, MD: NPDES MD0021601 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 18Pollutants under a numeric limit
- 9Pollutants with an effluent exceedance
PATAPSCO WWTP holds NPDES permit MD0021601, which discharges to Patapsco River. EPA’s file records it issued September 21, 2010 and expiring September 30, 2015. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | PATAPSCO WWTP |
|---|---|
| Permittee as filed | PATAPSCO WWTP |
| NPDES ID | MD0021601 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | September 21, 2010 |
| Expiration date | September 30, 2015 |
| Issuing agency | MDE |
| Address | Baltimore, MD 21226 |
| Receiving water | PATAPSCO RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Jones Falls (HUC 020600031201) |
| Other EPA IDs (FRS) | RCRA handler MDD052340973; ICIS-AIR source MD0000002451000565 |
Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 22Pollutants on file
- 18Under a numeric limit
- 17With a violation of any kind
- 9With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Phosphorus, total [as P] | 8 | 125 | 115 | October 31, 2025 | 388% over the limit |
| Nitrogen, total [as N] | 5 | 96 | 95 | October 31, 2025 | 1,453% over the limit |
| Solids, total suspended | 4 | 66 | 38 | April 30, 2024 | 244% over the limit |
| BOD, 5-day, 20 deg. C | 4 | 47 | 31 | March 31, 2026 | 142% over the limit |
| Enterococci | 1 | 23 | 23 | May 31, 2022 | 403% over the limit |
| Nitrogen, ammonia total [as N] | 2 | 19 | 17 | August 31, 2022 | 297% over the limit |
| pH | 2 | 17 | 14 | November 30, 2024 | |
| Oxygen, dissolved [DO] | 2 | 17 | 7 | December 31, 2021 | 32% over the limit |
| Chlorine, total residual | 1 | 2 | 1 | November 30, 1995 | 1,000% over the limit |
| Cyanide, free [amenable to chlorination] | 2 | 20 | 0 | ||
| Phosphate, ortho [as P] | 0 | 18 | 0 | ||
| Heptachlor epoxide | 0 | 10 | 0 | ||
| Polychlorinated biphenyls [PCB] pg/L | 0 | 10 | 0 | ||
| Copper, total [as Cu] | 2 | 4 | 0 | ||
| Mercury, total [as Hg] | 0 | 4 | 0 | ||
| Nitrogen, organic total [as N] | 2 | 2 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 2 | 0 | ||
| Nitrite + Nitrate total [as N] | 2 | 0 | 0 | ||
| Zinc, total [as Zn] | 2 | 0 | 0 | ||
| Phosphorous, in total orthophosphate | 2 | 0 | 0 | ||
| E. coli | 1 | 0 | 0 | ||
| Flow, total | 1 | 0 | 0 |
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES MD0021601.
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
Watch this permit
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How we handle your data → Privacy
EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID MD0021601 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.