Clean Water Act discharge permit · NPDES LA0073521
ST. CHARLES PARISH COUNCIL - HAHNVILLE STP, Hahnville, LA: NPDES LA0073521 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 17Pollutants under a numeric limit
- 6Pollutants with an effluent exceedance
ST. CHARLES PARISH COUNCIL - HAHNVILLE STP, held by St. Charles Parish Council - Hahnville STP, holds NPDES permit LA0073521, which discharges to Providence Canal. EPA’s file records it issued September 29, 2016 and expiring October 31, 2021. 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 | ST. CHARLES PARISH COUNCIL - HAHNVILLE STP |
|---|---|
| Permittee as filed | St. Charles Parish Council - Hahnville STP |
| NPDES ID | LA0073521 |
| 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 29, 2016 |
| Expiration date | October 31, 2021 |
| Address | Hahnville, LA 70057 |
| Receiving water | PROVIDENCE CANAL |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Bayou Becnel-Frontal Lac des Allemands (HUC 080903010204) |
| SIC | 4952 – Sewerage Systems |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.
Effluent limits and exceedances
- 20Pollutants on file
- 17Under a numeric limit
- 15With a violation of any kind
- 6With 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 |
|---|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | 3 | 20 | 17 | June 30, 2000 | 287% over the limit |
| Solids, total suspended | 3 | 14 | 11 | January 31, 2024 | 70% over the limit |
| pH | 2 | 11 | 3 | May 31, 2010 | |
| Carbon, tot organic [TOC] | 0 | 6 | 3 | June 30, 2009 | 786% over the limit |
| Coliform, fecal general | 2 | 4 | 2 | June 30, 2018 | 222% over the limit |
| Oil and grease | 0 | 4 | 1 | June 30, 2010 | 10% over the limit |
| Flow, in conduit or thru treatment plant | 2 | 8 | 0 | ||
| Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex | 2 | 8 | 0 | ||
| LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas | 2 | 8 | 0 | ||
| NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex | 2 | 8 | 0 | ||
| NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas | 2 | 8 | 0 | ||
| Turbidity | 0 | 6 | 0 | ||
| Priority pollutants scan [yes/no] | 1 | 2 | 0 | ||
| Coef Of Var Static Renewal 48Hr Acute D. pulex | 1 | 2 | 0 | ||
| Coef Of Var Static Renewal 48Hr Acute Pimephales promelas | 1 | 2 | 0 | ||
| Nitrogen, total [as N] | 6 | 0 | 0 | ||
| Phosphorus, total [as P] | 6 | 0 | 0 | ||
| Whole effluent toxicity - retest #1 | 4 | 0 | 0 | ||
| Whole effluent toxicity - retest #2 | 4 | 0 | 0 | ||
| Whole Effluent Toxicity - Retest #3 | 4 | 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
- 17Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| April 30, 2026 | Failure to minimize or prevent SSO to waters of the U.S. - adverse impacts [40 CFR 122.41(d)] | ST6 |
| April 30, 2026 | Failure to properly operate and maintain the sanitary sewer system [40 CFR 122.41(e)] | ST6 |
| December 31, 2025 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
| December 31, 2022 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
| February 28, 2022 | Failure to minimize or prevent SSO to waters of the U.S. - adverse impacts [40 CFR 122.41(d)] | ST6 |
| February 28, 2022 | Failure to properly operate and maintain the sanitary sewer system [40 CFR 122.41(e)] | ST6 |
| May 31, 2021 | WW SSO - Discharge to Waters | ST6 |
| May 31, 2021 | WW SSO - Improper Operation and Maintenance | ST6 |
| January 31, 2021 | WW SSO - Discharge to Waters | ST6 |
| January 31, 2021 | WW SSO - Improper Operation and Maintenance | ST6 |
| October 12, 2020 | WW SSO - Improper Operation and Maintenance | ST6 |
| May 15, 2020 | WW SSO - Improper Operation and Maintenance | ST6 |
| May 4, 2020 | WW SSO - Improper Operation and Maintenance | ST6 |
| March 1, 2020 | WW SSO - Discharge to Waters | ST6 |
| November 30, 2018 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
| November 30, 2018 | Effluent Violations - Unapproved Bypass | ST6 |
| June 30, 2018 | Management Practice Violations - Improper Operation and Maintenance | 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.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.