Clean Water Act discharge permit · NPDES DE0020265
SEAFORD WASTEWATER TREATMENT PLANT, Seaford, DE: NPDES DE0020265 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 11Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
SEAFORD WASTEWATER TREATMENT PLANT, held by Seaford Wastewater Treatment Plant, holds NPDES permit DE0020265, which discharges to Nanticoke River. EPA’s file records it issued June 1, 2008 and expiring May 31, 2013. 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 | SEAFORD WASTEWATER TREATMENT PLANT |
|---|---|
| Permittee as filed | Seaford Wastewater Treatment Plant |
| NPDES ID | DE0020265 |
| 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 1, 2008 |
| Expiration date | May 31, 2013 |
| Address | Seaford, DE 19973 |
| Receiving water | NANTICOKE RIVER |
| Subwatershed | Butler Mill Branch-Nanticoke River (HUC 020801090405) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 18Pollutants on file
- 11Under a numeric limit
- 18With a violation of any kind
- 5With 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 |
|---|---|---|---|---|---|
| Solids, total suspended | 4 | 6 | 2 | November 30, 2000 | 23% over the limit |
| Enterococci: group D, MF trans, M-E, EIA | 1 | 94 | 1 | June 30, 2022 | 30% over the limit |
| Phosphorus, total [as P] | 4 | 6 | 1 | September 30, 2008 | 13% over the limit |
| Copper, dissolved [as Cu] | 4 | 5 | 1 | October 31, 2020 | 18% over the limit |
| pH | 2 | 3 | 1 | May 31, 2002 | |
| Nitrogen, total [as N] | 9 | 58 | 0 | ||
| Chlorine, total residual | 1 | 7 | 0 | ||
| BOD, 5-day, 20 deg. C | 4 | 4 | 0 | ||
| Hardness, total [as CaCO3] | 4 | 4 | 0 | ||
| Zinc, dissolved [as Zn] | 4 | 4 | 0 | ||
| Oxygen, dissolved [DO] | 0 | 4 | 0 | ||
| Nitrogen, organic total [as N] | 0 | 4 | 0 | ||
| Nitrogen, ammonia total [as N] | 0 | 4 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 0 | 4 | 0 | ||
| Nitrite + Nitrate total [as N] | 0 | 4 | 0 | ||
| Phosphorous, total organic [as P] | 0 | 4 | 0 | ||
| Phosphate, ortho [as P] | 0 | 4 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 2 | 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
- 1Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| December 31, 2025 | PR: Failure to issue/reissue control mechanisms to at least 90% of SIU/CIUs w/in 6 months (Level II) | ST6 |
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
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, DE0020265.
Start the watch
- One permit holder — $99/month
- One watershed — $2,990/year
- One state — $4,990/year
- The whole register — $18,000/year
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 DE0020265 there.
Nearby on the register
- Discharge permits in Seaford
- Every permit record in Seaford, A to Z
- Discharge permits in Delaware
- Every permit record in Delaware, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.