Clean Water Act discharge permit · NPDES LA0045730
DENHAM SPRINGS, CITY OF, Denham Springs, LA: NPDES LA0045730 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 26Pollutants under a numeric limit
- 8Pollutants with an effluent exceedance
DENHAM SPRINGS, CITY OF, held by City of Denham Springs, holds NPDES permit LA0045730, which discharges to Amite River/Lake Pontchartrain. EPA’s file records it issued August 20, 2015 and expiring September 30, 2020. 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 | DENHAM SPRINGS, CITY OF |
|---|---|
| Permittee as filed | City of Denham Springs |
| NPDES ID | LA0045730 |
| 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 20, 2015 |
| Expiration date | September 30, 2020 |
| Address | Denham Springs, LA 70727 |
| Receiving water | AMITE RIVER/LAKE PONTCHARTRAIN |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Grays Creek-Amite River (HUC 080702020903) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 31Pollutants on file
- 26Under a numeric limit
- 27With a violation of any kind
- 8With 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, carbonaceous [5 day, 20 C] | 6 | 228 | 174 | July 31, 2026 | 3,770% over the limit |
| Nitrogen, ammonia total [as N] | 6 | 201 | 155 | July 31, 2026 | 1,350% over the limit |
| Solids, total suspended | 3 | 191 | 154 | May 31, 2026 | 761% over the limit |
| Coliform, fecal general | 2 | 130 | 100 | July 31, 2026 | 99,999% over the limit |
| Oxygen, dissolved [DO] | 1 | 35 | 20 | August 31, 2021 | 78% over the limit |
| Chlorine, total residual | 0 | 15 | 14 | September 30, 2022 | 5,961% over the limit |
| Whole Effluent Toxicity [WET] - P. promelas | 2 | 18 | 8 | November 30, 2023 | 100% over the limit |
| pH | 2 | 49 | 3 | July 31, 2021 | |
| Flow, in conduit or thru treatment plant | 2 | 46 | 0 | ||
| Phosphorus, total [as P] | 2 | 23 | 0 | ||
| Nitrogen, total [as N] | 2 | 21 | 0 | ||
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | 2 | 14 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | 2 | 14 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 2 | 14 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas | 2 | 12 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 10 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 10 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 10 | 0 | ||
| Coef Of Var Static Renewal 7Day Chronic Pimephales promelas | 1 | 10 | 0 | ||
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | 2 | 8 | 0 | ||
| Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia | 1 | 8 | 0 | ||
| Chloride [as Cl] | 0 | 7 | 0 | ||
| Sulfate, total [as SO4] | 0 | 7 | 0 | ||
| Solids, total dissolved | 0 | 7 | 0 | ||
| Whole effluent toxicity - retest #1 | 2 | 2 | 0 | ||
| Whole effluent toxicity - retest #2 | 2 | 2 | 0 | ||
| Nitrogen, nitrate total [as N] | 0 | 2 | 0 | ||
| WET, sublethal retest #1 | 2 | 0 | 0 | ||
| WET, sublethal retest #2 | 2 | 0 | 0 | ||
| Whole Effluent Toxicity - Retest #3 | 2 | 0 | 0 | ||
| Whole Effluent Toxicity, Sub-Lethal Retest #3 | 2 | 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
- 27Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| June 30, 2025 | Permit Violations - Failure to Submit Timely Permit Renewal Application | ST6 |
| January 31, 2024 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
| September 30, 2023 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| March 2, 2023 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
| June 30, 2022 | Monitoring Violations - Failure to Monitor for Toxicity Requirements | ST6 |
| May 31, 2022 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| April 30, 2022 | Monitoring Violations - Failure to Monitor for Toxicity Requirements | ST6 |
| March 31, 2022 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| March 31, 2022 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
| January 31, 2022 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
| January 31, 2021 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
| September 1, 2020 | Effluent Violations - Unauthorized Discharge | ST6 |
| February 12, 2020 | Effluent Violations - Unauthorized Discharge | ST6 |
| August 27, 2019 | Monitoring Violations - Improper Analysis or Lab Error | ST6 |
| August 27, 2019 | Monitoring Violations - Invalid/Unrepresentative Sample | ST6 |
| August 27, 2019 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
| August 27, 2019 | WW Storm Water Non-Construction - Failure to Conduct Inspections | ST6 |
| July 17, 2019 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
| July 17, 2019 | WW SSO - Improper Operation and Maintenance | ST6 |
| July 17, 2019 | WW Storm Water Non-Construction - Failure to Implement SWPPP/SWMP | ST6 |
| May 10, 2019 | Effluent Violations - Unauthorized Discharge | ST6 |
| July 25, 2018 | WW SSO - Discharge to Waters | ST6 |
| July 25, 2018 | WW SSO - Improper Operation and Maintenance | ST6 |
| August 3, 2017 | WW Storm Water Non-Construction - Failure to Implement SWPPP/SWMP | ST6 |
| June 22, 2017 | Effluent Violations - Unauthorized Discharge | ST6 |
| June 22, 2017 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
| January 2, 2017 | Effluent Violations - Unauthorized Discharge | 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.