Clean Water Act discharge permit · NPDES TN0058181
LOUDON STP, Loudon, TN: NPDES TN0058181 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 16Pollutants under a numeric limit
- 12Pollutants with an effluent exceedance
LOUDON STP, held by Loudon Utilities Board, holds NPDES permit TN0058181, which discharges to Tennessee-Watts Bar Lake. EPA’s file records it issued December 5, 2016 and expiring November 30, 2021. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | LOUDON STP |
|---|---|
| Permittee as filed | Loudon Utilities Board |
| NPDES ID | TN0058181 |
| 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 | December 5, 2016 |
| Expiration date | November 30, 2021 |
| Issuing agency | TDEC - DWR |
| Address | Loudon, TN 37774 |
| Receiving water | Tennessee-Watts Bar Lake |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Tennessee River-Town Creek (HUC 060102010302) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 22Pollutants on file
- 16Under a numeric limit
- 18With a violation of any kind
- 12With 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, suspended percent removal | 2 | 83 | 79 | July 31, 2024 | 1,131% over the limit |
| Solids, total suspended | 7 | 56 | 42 | July 31, 2025 | 2,627% over the limit |
| SSO, Dry Weather | 0 | 32 | 32 | July 31, 2026 | 2,147,483,650% over the limit |
| E. coli | 2 | 26 | 26 | July 31, 2026 | 247% over the limit |
| E. coli, MTEC-MF | 0 | 23 | 21 | October 31, 2016 | 397% over the limit |
| Chlorine, total residual | 1 | 21 | 19 | January 31, 2026 | 300% over the limit |
| SSO, Wet Weather | 0 | 9 | 9 | May 31, 2026 | 2,147,483,650% over the limit |
| BOD, 5-day, 20 deg. C | 7 | 22 | 8 | October 31, 2015 | 531% over the limit |
| Oxygen, dissolved [DO] | 1 | 4 | 2 | June 30, 2008 | 70% over the limit |
| Solids, settleable | 1 | 4 | 2 | July 31, 2015 | 99,999% over the limit |
| Coliform, fecal MF, MFC broth, 44.5 C | 0 | 13 | 1 | August 31, 2003 | 44% over the limit |
| BOD, 5-day, percent removal | 2 | 5 | 1 | August 31, 2003 | 18% over the limit |
| Flow, in conduit or thru treatment plant | 4 | 8 | 0 | ||
| LC50 Static 48Hr Acute Ceriodaphnia dubia | 0 | 5 | 0 | ||
| pH | 2 | 4 | 0 | ||
| Overflows | 2 | 4 | 0 | ||
| LC50 Static 48Hr Acute Pimephales promelas | 0 | 3 | 0 | ||
| Bypass valve | 1 | 2 | 0 | ||
| Nitrogen, total [as N] | 2 | 0 | 0 | ||
| Phosphorus, total [as P] | 2 | 0 | 0 | ||
| LC50 Static Renewal 48Hr Acute Ceriodaphnia dubia | 1 | 0 | 0 | ||
| LC50 Static Renewal 48Hr Acute 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
- 3Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| September 30, 2024 | Pretreatment - Failure to Conduct Inspections | ST6 |
| December 16, 2022 | Pretreatment - Failure to Meet Inspection and Sampling Plan for SIUs | ST6 |
| October 3, 2022 | Pretreatment - Failure to submit required report (non-DMR) | 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
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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 TN0058181 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.