Clean Water Act discharge permit · NPDES LA0047180
SLIDELL CITY OF - TERRACE AVENUE WWTP, Slidell, LA: NPDES LA0047180 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 26Pollutants under a numeric limit
- 4Pollutants with an effluent exceedance
SLIDELL CITY OF - TERRACE AVENUE WWTP, held by City of Slidell, holds NPDES permit LA0047180, which discharges to W-14 Canal Salt Bayou. EPA’s file records it issued August 17, 2018 and expiring August 31, 2023. 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 | SLIDELL CITY OF - TERRACE AVENUE WWTP |
|---|---|
| Permittee as filed | City of Slidell |
| NPDES ID | LA0047180 |
| 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 | August 17, 2018 |
| Expiration date | August 31, 2023 |
| Address | Slidell, LA 70459 |
| Receiving water | W-14 CANAL SALT BAYOU |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Salt Bayou (HUC 080902010307) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 36Pollutants on file
- 26Under a numeric limit
- 18With 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 |
|---|---|---|---|---|---|
| Solids, total suspended | 3 | 17 | 5 | March 31, 2021 | 117% over the limit |
| Chlorine, total residual | 1 | 4 | 4 | January 31, 2026 | 264% over the limit |
| Nitrogen, ammonia total [as N] | 3 | 8 | 2 | November 30, 2023 | 67% over the limit |
| Coliform, fecal general | 2 | 9 | 1 | November 30, 2023 | 21% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 3 | 12 | 0 | ||
| Coef Of Var Static Renewal 7Day Chronic Menidia menidia | 0 | 11 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 10 | 0 | ||
| Pass/Fail Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 0 | 10 | 0 | ||
| Pass/Fail Static Renewal 7Day Chronic Menidia | 0 | 10 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Americamysis bahia (Mysidopsis bahia) | 0 | 10 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Menidia menidia | 0 | 10 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 0 | 10 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Menidia menidia | 0 | 10 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 0 | 10 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Menidia menidia | 0 | 10 | 0 | ||
| pH | 2 | 8 | 0 | ||
| Coef Of Var Static Renewal 7Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 0 | 7 | 0 | ||
| Oxygen, dissolved [DO] | 1 | 4 | 0 | ||
| Whole effluent toxicity - retest #1 | 4 | 0 | 0 | ||
| Whole effluent toxicity - retest #2 | 4 | 0 | 0 | ||
| WET, sublethal retest #1 | 4 | 0 | 0 | ||
| WET, sublethal retest #2 | 4 | 0 | 0 | ||
| Whole Effluent Toxicity - Retest #3 | 4 | 0 | 0 | ||
| Whole Effluent Toxicity, Sub-Lethal Retest #3 | 4 | 0 | 0 | ||
| Nitrogen, total [as N] | 3 | 0 | 0 | ||
| Phosphorus, total [as P] | 3 | 0 | 0 | ||
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 0 | 0 | ||
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | 2 | 0 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 0 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas | 2 | 0 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 0 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | 2 | 0 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 0 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 2 | 0 | 0 | ||
| Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia | 1 | 0 | 0 | ||
| Coef Of Var Static Renewal 7Day Chronic Pimephales promelas | 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
- 20Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| September 30, 2023 | WW SSO - Improper Operation and Maintenance | ST6 |
| April 26, 2023 | Permit Violations - Failure to Submit Timely Permit Renewal Application | ST6 |
| January 16, 2023 | WW SSO - Improper Operation and Maintenance | ST6 |
| January 16, 2023 | WW SSO - Discharge to Waters | ST6 |
| December 29, 2022 | WW SSO - Improper Operation and Maintenance | ST6 |
| December 19, 2022 | WW SSO - Discharge to Waters | ST6 |
| December 15, 2022 | Failure to develop, maintain, or get approval of an adequate SWPPP (industrial stormwater) | ST6 |
| December 15, 2022 | Management Practice Violations - Failure to Implement SPCC Plan | ST6 |
| November 14, 2022 | WW SSO - Discharge to Waters | ST6 |
| July 25, 2022 | WW SSO - Improper Operation and Maintenance | ST6 |
| September 7, 2021 | WW SSO - Improper Operation and Maintenance | ST6 |
| September 7, 2021 | WW SSO - Discharge to Waters | ST6 |
| November 17, 2020 | Management Practice Violations - Violation of a milestone in an order | ST6 |
| October 29, 2020 | WW SSO - Discharge to Waters | ST6 |
| October 29, 2020 | WW SSO - Improper Operation and Maintenance | ST6 |
| August 31, 2020 | WW SSO - Improper Operation and Maintenance | ST6 |
| October 31, 2019 | WW SSO - Improper Operation and Maintenance | ST6 |
| October 31, 2019 | WW SSO - Discharge to Waters | ST6 |
| November 30, 2017 | WW SSO - Improper Operation and Maintenance | ST6 |
| November 30, 2017 | WW SSO - Discharge to Waters | 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 September 15, 2026.