Clean Water Act discharge permit · NPDES MS0021539
MENDENHALL POTW, Mendenhall, MS: NPDES MS0021539 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 9Pollutants under a numeric limit
- 10Pollutants with an effluent exceedance
MENDENHALL POTW holds NPDES permit MS0021539, which discharges to Directly Into Sellers Creek. EPA’s file records it issued November 9, 2018 and expiring October 31, 2023. 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 | MENDENHALL POTW |
|---|---|
| Permittee as filed | MENDENHALL POTW |
| NPDES ID | MS0021539 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | November 9, 2018 |
| Expiration date | October 31, 2023 |
| Issuing agency | MDEQ |
| Address | Mendenhall, MS 39114 |
| Receiving water | DIRECTLY INTO SELLERS CREEK |
| Subwatershed | Sellers Creek (HUC 031800020804) |
| Program components on file | POTW, Pretreatment |
| NAICS | 221320 – Sewage Treatment Facilities |
| 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
- 13Pollutants on file
- 9Under a numeric limit
- 13With 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 |
|---|---|---|---|---|---|
| Chlorine, total residual | 2 | 19 | 11 | December 31, 2024 | 5,426% over the limit |
| Coliform, fecal general | 0 | 14 | 10 | December 31, 2014 | 4,400% over the limit |
| Solids, suspended percent removal | 1 | 10 | 7 | December 31, 2025 | 452% over the limit |
| BOD, 5-day, 20 deg. C | 8 | 30 | 6 | December 31, 2025 | 63% over the limit |
| E. coli | 2 | 8 | 6 | December 31, 2024 | 1,821% over the limit |
| Oxygen, dissolved [DO] | 1 | 10 | 5 | December 31, 2024 | 82% over the limit |
| BOD, 5-day, percent removal | 1 | 8 | 4 | December 31, 2025 | 186% over the limit |
| Solids, total suspended | 8 | 26 | 2 | December 31, 2024 | 18% over the limit |
| Flow, in conduit or thru treatment plant | 1 | 5 | 2 | December 31, 2025 | 5% over the limit |
| pH | 2 | 7 | 1 | December 31, 2023 | |
| Nitrogen, total [as N] | 0 | 8 | 0 | ||
| Nitrogen, ammonia total [as N] | 0 | 8 | 0 | ||
| Phosphorus, total [as P] | 0 | 8 | 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
- 3Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| March 27, 2025 | Management Practice Violations - No Licensed/Certified Operator | ST6 |
| March 27, 2025 | Monitoring Violations - Analysis not Conducted | ST6 |
| March 27, 2025 | Effluent Violations - Inspection sample above historic DMR range | 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.
Watch this permit
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, MS0021539.
Start the watch
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- One watershed — $2,990/year
- One state — $4,990/year
- The whole register — $18,000/year
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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 MS0021539 there.
Nearby on the register
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- Every permit record in Mendenhall, A to Z
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- Every permit record in Mississippi, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.