Clean Water Act discharge permit · NPDES MD0023001
POOLESVILLE WWTP, Poolesville, MD: NPDES MD0023001 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 19Pollutants under a numeric limit
- 9Pollutants with an effluent exceedance
POOLESVILLE WWTP, held by Town of Poolesville, holds NPDES permit MD0023001, which discharges to Dry Seneca Creek. EPA’s file records it issued July 24, 2014 and expiring August 31, 2019. 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 | POOLESVILLE WWTP |
|---|---|
| Permittee as filed | Town of Poolesville |
| NPDES ID | MD0023001 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | July 24, 2014 |
| Expiration date | August 31, 2019 |
| Issuing agency | MD DEPARTMENT OF THE ENVIRONMENT |
| Address | Poolesville, MD 20837 |
| Receiving water | Dry Seneca Creek |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Dry Seneca Creek-Seneca Creek (HUC 020700080803) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 23Pollutants on file
- 19Under a numeric limit
- 22With 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 |
|---|---|---|---|---|---|
| Flow, in conduit or thru treatment plant | 2 | 61 | 40 | October 31, 2003 | 123% over the limit |
| Nitrogen, Kjeldahl, total [as N] | 4 | 36 | 32 | June 30, 2004 | 283% over the limit |
| BOD, 5-day, 20 deg. C | 4 | 30 | 17 | March 31, 2026 | 408% over the limit |
| Solids, total suspended | 6 | 25 | 4 | December 31, 2003 | 20% over the limit |
| Nitrogen, total [as N] | 6 | 18 | 4 | December 31, 2018 | 10% over the limit |
| Coliform, fecal general | 0 | 28 | 2 | March 31, 2004 | 51% over the limit |
| Phosphorus, total [as P] | 4 | 19 | 2 | February 29, 2004 | 600% over the limit |
| Oxygen, dissolved [DO] | 2 | 6 | 1 | August 31, 2013 | 88% over the limit |
| E. coli | 1 | 3 | 1 | September 30, 2011 | 233% over the limit |
| Flow | 4 | 37 | 0 | ||
| Flow, total | 5 | 22 | 0 | ||
| Discharge event observation [Visual Monitoring] | 2 | 18 | 0 | ||
| Chlorine, total residual | 1 | 15 | 0 | ||
| Nitrogen, ammonia total [as N] | 8 | 14 | 0 | ||
| Phosphorous, in total orthophosphate | 0 | 11 | 0 | ||
| Nitrogen, organic total [as N] | 1 | 10 | 0 | ||
| Nitrite + Nitrate total [as N] | 1 | 10 | 0 | ||
| pH | 2 | 8 | 0 | ||
| Alkalinity, total [as CaCO3] | 1 | 2 | 0 | ||
| Hardness, total [as CaCO3] | 1 | 2 | 0 | ||
| Conductivity | 0 | 1 | 0 | ||
| N-Nitrosodimethylamine [NDMA] | 0 | 1 | 0 | ||
| Phosphate, ortho [as P] | 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 MD0023001.
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
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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 MD0023001 there.
Nearby on the register
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- Every permit record in Poolesville, A to Z
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- Every permit record in Maryland, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.