Clean Water Act discharge permit · NPDES NH0100901
CONCORD HALL STREET W W T P, Concord, NH: NPDES NH0100901 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 19Pollutants under a numeric limit
- 12Pollutants with an effluent exceedance
CONCORD HALL STREET W W T P, held by CONCORD-HALL STREET CITY OF, holds NPDES permit NH0100901, which discharges to Merrimack River. EPA’s file records it issued September 6, 2011 and expiring November 30, 2016. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | CONCORD HALL STREET W W T P |
|---|---|
| Permittee as filed | CONCORD-HALL STREET CITY OF |
| NPDES ID | NH0100901 |
| 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 6, 2011 |
| Expiration date | November 30, 2016 |
| Address | Concord, NH 03301 |
| Receiving water | MERRIMACK RIVER |
| Subwatershed | Warner River (HUC 010700030404) |
| Program components on file | POTW, Pretreatment |
| SIC | 4952 – Sewerage Systems |
| Other EPA IDs (FRS) | RCRA handler NHD510064959; ICIS-AIR source NH0000003301300130 |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download; cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 24Pollutants on file
- 19Under a numeric limit
- 14With a violation of any kind
- 12With 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 |
|---|---|---|---|---|---|
| LC50 Static Renewal 48Hr Acute Pimephales promelas | 1 | 37 | 37 | June 30, 2022 | 39% over the limit |
| LC50 Static Renewal 48Hr Acute Ceriodaphnia dubia | 1 | 11 | 11 | June 30, 2022 | 68% over the limit |
| E. coli, thermotol, MF, MTEC | 0 | 11 | 11 | September 30, 2010 | 99,999% over the limit |
| pH | 2 | 6 | 6 | July 31, 2026 | |
| Solids, total suspended | 8 | 4 | 3 | May 31, 2006 | 39% over the limit |
| BOD, 5-day, 20 deg. C | 8 | 3 | 3 | May 31, 2006 | 79% over the limit |
| Chlorine, total residual | 2 | 3 | 3 | April 30, 2005 | 99,999% over the limit |
| E. coli, colony forming units [CFU] | 2 | 3 | 3 | August 31, 2016 | 389% over the limit |
| E. coli | 0 | 3 | 3 | September 30, 2023 | 99,999% over the limit |
| LC50 Static 48Hr Acute Pimephales promelas | 0 | 3 | 3 | March 31, 2026 | 43% over the limit |
| LC50 Static 48Hr Acute Ceriodaphnia dubia | 0 | 2 | 2 | March 31, 2024 | 29% over the limit |
| Solids, suspended percent removal | 1 | 1 | 1 | January 31, 2005 | 99,999% over the limit |
| Nitrogen, total [as N] | 0 | 4 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 1 | 0 | ||
| Phosphorus, total [as P] | 3 | 0 | 0 | ||
| Aluminum, total recoverable | 2 | 0 | 0 | ||
| Nitrogen, ammonia total [as N] | 1 | 0 | 0 | ||
| Hardness, total [as CaCO3] | 1 | 0 | 0 | ||
| Nickel, total recoverable | 1 | 0 | 0 | ||
| Zinc, total recoverable | 1 | 0 | 0 | ||
| Cadmium, total recoverable | 1 | 0 | 0 | ||
| Lead, total recoverable | 1 | 0 | 0 | ||
| Copper, total recoverable | 1 | 0 | 0 | ||
| BOD, 5-day, percent removal | 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
- 3Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| March 31, 2025 | PR: Failure to sample at least 80% of SIU/CIUs within the past 12 month reporting period (Level II) | EP6 |
| March 31, 2025 | PR: Failure to inspect at least 80% of SIU/CIUs within the past 12 month reporting period (Level II) | EP6 |
| March 13, 2024 | Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | EP6 |
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, NH0100901.
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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 NH0100901 there.
Nearby on the register
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- Every permit record in Concord, A to Z
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- Every permit record in New Hampshire, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.