Clean Water Act discharge permit · NPDES MD0022527
MOUNT AIRY WWTP, Mount Airy, MD: NPDES MD0022527 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 18Pollutants under a numeric limit
- 2Pollutants with an effluent exceedance
MOUNT AIRY WWTP, held by MT. AIRY WWTP, holds NPDES permit MD0022527, which discharges to South Branch Of The Patapsco River. EPA’s file records it issued June 21, 2010 and expiring July 31, 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 | MOUNT AIRY WWTP |
|---|---|
| Permittee as filed | MT. AIRY WWTP |
| NPDES ID | MD0022527 |
| 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 | June 21, 2010 |
| Expiration date | July 31, 2015 |
| Issuing agency | MDE |
| Address | Mount Airy, MD 21771 |
| Receiving water | SOUTH BRANCH OF THE PATAPSCO RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Hay Meadow Branch-South Branch Patapsco River (HUC 020600031002) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 20Pollutants on file
- 18Under a numeric limit
- 18With a violation of any kind
- 2With 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 |
|---|---|---|---|---|---|
| Nitrogen, Kjeldahl, total [as N] | 4 | 14 | 1 | September 30, 1998 | 22% over the limit |
| Nitrogen, ammonia total [as N] | 4 | 13 | 1 | May 31, 2024 | 19% over the limit |
| Temperature, water deg. fahrenheit | 6 | 57 | 0 | ||
| Solids, total suspended | 4 | 28 | 0 | ||
| Nitrogen, total [as N] | 8 | 20 | 0 | ||
| Phosphorus, total [as P] | 8 | 19 | 0 | ||
| BOD, 5-day, 20 deg. C | 8 | 12 | 0 | ||
| Copper, total [as Cu] | 0 | 10 | 0 | ||
| Oxygen, dissolved [DO] | 2 | 9 | 0 | ||
| Nitrite + Nitrate total [as N] | 4 | 8 | 0 | ||
| Phosphorous, in total orthophosphate | 4 | 6 | 0 | ||
| pH | 2 | 6 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 6 | 0 | ||
| Nitrogen, organic total [as N] | 4 | 4 | 0 | ||
| Flow, total | 2 | 3 | 0 | ||
| Hardness, total [as CaCO3] | 1 | 3 | 0 | ||
| E. coli | 1 | 3 | 0 | ||
| Flow | 0 | 3 | 0 | ||
| Lead, total recoverable | 2 | 0 | 0 | ||
| Copper, total recoverable | 2 | 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 MD0022527.
Velarion’s copy of EPA’s ICIS-NPDES files does not yet 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
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, MD0022527.
Start the watch
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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 MD0022527 there.
Nearby on the register
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- Every permit record in Maryland, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.