Clean Water Act discharge permit · NPDES NH0100455
DURHAM WWTP, Durham, NH: NPDES NH0100455 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 19Pollutants under a numeric limit
- 11Pollutants with an effluent exceedance
DURHAM WWTP, held by DURHAM W W T F, holds NPDES permit NH0100455, which discharges to Oyster River Estuary. EPA’s file records it issued December 15, 1999 and expiring January 29, 2005. 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 | DURHAM WWTP |
|---|---|
| Permittee as filed | DURHAM W W T F |
| NPDES ID | NH0100455 |
| 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 | December 15, 1999 |
| Expiration date | January 29, 2005 |
| Address | Durham, NH 03824 |
| Receiving water | OYSTER RIVER ESTUARY |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Oyster River (HUC 010600030902) |
| Other EPA IDs (FRS) | ICIS-AIR source NH0000003301700071 |
Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 19Pollutants on file
- 19Under a numeric limit
- 19With a violation of any kind
- 11With 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 |
|---|---|---|---|---|---|
| pH | 2 | 71 | 69 | March 31, 2025 | |
| Coliform, fecal general | 4 | 70 | 62 | November 30, 2025 | 99,999% over the limit |
| Solids, total suspended | 7 | 54 | 34 | June 30, 2014 | 664% over the limit |
| NOEL Static 1Hr 20min Fert. Chronic Arbacia punctulata | 1 | 20 | 13 | September 30, 2015 | 99,999% over the limit |
| Noel Statre 7Day Chronic Menidia | 1 | 19 | 13 | June 30, 2022 | 99,999% over the limit |
| Solids, suspended percent removal | 1 | 7 | 5 | April 30, 2003 | 202% over the limit |
| BOD, 5-day, 20 deg. C | 7 | 24 | 4 | February 28, 2003 | 53% over the limit |
| LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia) | 1 | 10 | 4 | June 30, 2007 | 99,999% over the limit |
| LC50 Static 48Hr Acute Menidia | 1 | 10 | 4 | June 30, 2007 | 99,999% over the limit |
| BOD, 5-day, percent removal | 1 | 4 | 3 | March 31, 2003 | 31% over the limit |
| Chlorine, total residual | 2 | 8 | 2 | February 28, 2003 | 2,100% over the limit |
| Zinc, total recoverable | 2 | 7 | 0 | ||
| Nickel, total recoverable | 1 | 7 | 0 | ||
| Cadmium, total recoverable | 1 | 7 | 0 | ||
| Lead, total recoverable | 1 | 7 | 0 | ||
| Chromium, total recoverable | 1 | 7 | 0 | ||
| Copper, total recoverable | 2 | 5 | 0 | ||
| Nitrogen, ammonia total [as N] | 2 | 4 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 4 | 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
- 2Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| January 15, 2020 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| January 15, 2019 | Reporting Violations - Improper/ Incorrect Reporting | 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
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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 NH0100455 there.
Nearby on the register
- Discharge permits in Durham
- Every permit record in Durham, A to Z
- Discharge permits in New Hampshire
- Every permit record in New Hampshire, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.