Clean Water Act discharge permit · NPDES NC0021156
MOUNT HOLLY WWTP, Mount Holly, NC: NPDES NC0021156 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 15Pollutants under a numeric limit
- 7Pollutants with an effluent exceedance
MOUNT HOLLY WWTP, held by City of Mount Holly, holds NPDES permit NC0021156. EPA’s file records it issued November 4, 2019 and expiring February 29, 2024. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | MOUNT HOLLY WWTP |
|---|---|
| Permittee as filed | City of Mount Holly |
| NPDES ID | NC0021156 |
| 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 | November 4, 2019 |
| Expiration date | February 29, 2024 |
| Address | Mount Holly, NC 28120 |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Fites Creek-Catawba River (HUC 030501011405) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 17Pollutants on file
- 15Under a numeric limit
- 13With a violation of any kind
- 7With 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 |
|---|---|---|---|---|---|
| Oxygen, dissolved [DO] | 5 | 13 | 7 | November 30, 2020 | 98% over the limit |
| Coliform, fecal MF, MFC broth, 44.5 C | 2 | 9 | 7 | April 30, 2025 | 505% over the limit |
| Mercury, total [as Hg] | 0 | 7 | 5 | November 30, 2014 | 29% over the limit |
| Solids, total suspended | 3 | 11 | 2 | May 31, 2020 | 12% over the limit |
| Chlorine, total residual | 1 | 2 | 2 | September 30, 2018 | 79% over the limit |
| pH | 2 | 1 | 1 | September 30, 2016 | |
| Cyanide, total [as CN] | 0 | 1 | 1 | March 31, 2007 | 27% over the limit |
| Nitrogen, total [as N] | 2 | 115 | 0 | ||
| Phosphorus, total [as P] | 2 | 115 | 0 | ||
| BOD, 5-day, 20 deg. C | 3 | 9 | 0 | ||
| Temperature, water deg. centigrade | 5 | 6 | 0 | ||
| Conductivity | 4 | 6 | 0 | ||
| Flow, in conduit or thru treatment plant | 1 | 2 | 0 | ||
| Nitrogen, ammonia total [as N] | 1 | 0 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 1 | 0 | 0 | ||
| Nitrite + Nitrate total [as N] | 1 | 0 | 0 | ||
| Flow, total | 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
- 1Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| April 30, 2019 | Permit Violations - Unapproved Operation | 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 NC0021156 there.
Nearby on the register
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- Every permit record in North Carolina, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.