Clean Water Act discharge permit · NPDES LA0048941
ST TAMMANY PARISH GOVERNMENT - DEPARTMENT OF UTILITIES - CROSS GATES WWTP, Slidell, LA: NPDES LA0048941 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MajorDischarger class
- 22Pollutants under a numeric limit
- 10Pollutants with an effluent exceedance
ST TAMMANY PARISH GOVERNMENT - DEPARTMENT OF UTILITIES - CROSS GATES WWTP, held by St Tammany Parish Government - Department of Utilities - Cross Gates WWTP, holds NPDES permit LA0048941. EPA’s file records it issued May 20, 2025 and expiring June 30, 2030. 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 | ST TAMMANY PARISH GOVERNMENT - DEPARTMENT OF UTILITIES - CROSS GATES WWTP |
|---|---|
| Permittee as filed | St Tammany Parish Government - Department of Utilities - Cross Gates WWTP |
| NPDES ID | LA0048941 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | May 20, 2025 |
| Expiration date | June 30, 2030 |
| Issuing agency | LDEQ |
| Address | Slidell, LA 70461 |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Middle River-Pearl River (HUC 031800041004) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 29Pollutants on file
- 22Under a numeric limit
- 27With a violation of any kind
- 10With 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 | 73 | 17 | January 31, 2025 | 13,050% over the limit |
| Nitrogen, ammonia total [as N] | 3 | 97 | 16 | March 31, 2025 | 65% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 3 | 99 | 15 | April 30, 2025 | 153% over the limit |
| Solids, total suspended | 3 | 103 | 12 | March 31, 2025 | 561% over the limit |
| Lead, total [as Pb] | 0 | 29 | 9 | June 30, 2019 | 163% over the limit |
| Cyanide, total [as CN] | 0 | 7 | 7 | June 30, 2019 | 867% over the limit |
| Copper, total [as Cu] | 4 | 19 | 5 | September 30, 2020 | 1,000% over the limit |
| Zinc, total [as Zn] | 0 | 21 | 3 | September 30, 2020 | 1,224% over the limit |
| Cyanide, total recoverable | 0 | 6 | 2 | September 30, 2013 | 67% over the limit |
| Chlorine, total residual | 1 | 29 | 1 | December 31, 2009 | 1% over the limit |
| Flow, in conduit or thru treatment plant | 2 | 103 | 0 | ||
| pH | 2 | 94 | 0 | ||
| Coef Of Var Static Renewal 7Day Chronic Pimephales promelas | 1 | 32 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 2 | 30 | 0 | ||
| Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia | 2 | 30 | 0 | ||
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | 2 | 28 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas | 2 | 28 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | 2 | 28 | 0 | ||
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | 4 | 26 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 4 | 26 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 4 | 26 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 26 | 0 | ||
| Oil and grease | 0 | 20 | 0 | ||
| Carbon, tot organic [TOC] | 0 | 19 | 0 | ||
| Dichlorobromomethane | 0 | 14 | 0 | ||
| Whole Effluent Toxicity [WET] - C. dubia | 4 | 2 | 0 | ||
| Whole Effluent Toxicity [WET] - P. promelas | 2 | 2 | 0 | ||
| Nitrogen, total [as N] | 3 | 0 | 0 | ||
| Phosphorus, total [as P] | 3 | 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
- 10Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| July 31, 2022 | WW SSO - Improper Operation and Maintenance | ST6 |
| March 31, 2021 | WW SSO - Improper Operation and Maintenance | ST6 |
| October 31, 2020 | WW SSO - Improper Operation and Maintenance | ST6 |
| June 15, 2018 | Permit Violations - Violation Specified in Comment | ST6 |
| June 15, 2018 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| May 31, 2018 | WW SSO - Improper Operation and Maintenance | ST6 |
| April 20, 2018 | WW SSO - Overflow to Dry Land or Building Backup | ST6 |
| April 20, 2018 | WW SSO - Improper Operation and Maintenance | ST6 |
| April 14, 2018 | WW SSO - Discharge to Waters | ST6 |
| June 15, 2017 | Permit Violations - Violation Specified in Comment | 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.