Clean Water Act discharge permit · NPDES LA0120154
ST. TAMMANY PARISH GOVERNMENT - CASTINE REGIONAL SEWAGE TREATMENT PLANT, Mandeville, LA: NPDES LA0120154 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 25Pollutants under a numeric limit
- 4Pollutants with an effluent exceedance
ST. TAMMANY PARISH GOVERNMENT - CASTINE REGIONAL SEWAGE TREATMENT PLANT, held by St. Tammany Parish Government - Castine Regional Sewage Treatment Plant, holds NPDES permit LA0120154. EPA’s file records it issued March 21, 2017 and expiring April 30, 2022. 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. TAMMANY PARISH GOVERNMENT - CASTINE REGIONAL SEWAGE TREATMENT PLANT |
|---|---|
| Permittee as filed | St. Tammany Parish Government - Castine Regional Sewage Treatment Plant |
| NPDES ID | LA0120154 |
| 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 | March 21, 2017 |
| Expiration date | April 30, 2022 |
| Address | Mandeville, LA 70448 |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Bayou Castine-Cane Bayou (HUC 080902010303) |
| 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
- 25Pollutants on file
- 25Under a numeric limit
- 17With a violation of any kind
- 4With 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 |
|---|---|---|---|---|---|
| Coliform, fecal general | 2 | 15 | 9 | June 30, 2026 | 351% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 3 | 16 | 7 | March 31, 2026 | 135% over the limit |
| Solids, total suspended | 3 | 11 | 2 | October 31, 2025 | 18% over the limit |
| Chlorine, total residual | 1 | 2 | 2 | May 31, 2024 | 3,536% over the limit |
| Flow, in conduit or thru treatment plant | 2 | 14 | 0 | ||
| Nitrogen, ammonia total [as N] | 3 | 9 | 0 | ||
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | 4 | 6 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas | 4 | 6 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | 4 | 6 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 4 | 6 | 0 | ||
| pH | 2 | 6 | 0 | ||
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | 4 | 4 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 4 | 4 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 4 | 4 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 4 | 4 | 0 | ||
| Coef Of Var Static Renewal 7Day Chronic Pimephales promelas | 2 | 4 | 0 | ||
| Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia | 2 | 3 | 0 | ||
| Whole effluent toxicity - retest #1 | 8 | 0 | 0 | ||
| Whole effluent toxicity - retest #2 | 8 | 0 | 0 | ||
| WET, sublethal retest #1 | 8 | 0 | 0 | ||
| WET, sublethal retest #2 | 8 | 0 | 0 | ||
| Whole Effluent Toxicity - Retest #3 | 8 | 0 | 0 | ||
| Whole Effluent Toxicity, Sub-Lethal Retest #3 | 8 | 0 | 0 | ||
| Nitrogen, total [as N] | 6 | 0 | 0 | ||
| Phosphorus, total [as P] | 6 | 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
- 4Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| March 15, 2021 | WW SSO - Improper Operation and Maintenance | ST6 |
| March 28, 2019 | WW SSO - Discharge to Waters | ST6 |
| December 10, 2017 | WW SSO - Discharge to Waters | ST6 |
| December 8, 2017 | WW SSO - 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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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 LA0120154 there.
Nearby on the register
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.