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Clean Water Act discharge permit · NPDES TN0020613

MCKENZIE STP, Mc Kenzie, TN: NPDES TN0020613 discharge permit, effluent exceedances, inspections, penalties

MCKENZIE STP, held by City of McKenzie, holds NPDES permit TN0020613, which discharges to Obion-South Fork. EPA’s file records it issued December 21, 2020 and expiring February 28, 2026. 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 filedMCKENZIE STP
Permittee as filedCity of McKenzie
NPDES IDTN0020613
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeIndividual permit
Discharger classMajor discharger
Facility typePublicly owned treatment works
ProgramPublicly owned treatment works
IssuedDecember 21, 2020
Expiration dateFebruary 28, 2026
Issuing agencyTDEC - DWR
AddressMc Kenzie, TN 38201
Receiving waterObion-South Fork
Receiving water impaired303(D) Listed
SubwatershedSouth Fork Obion River Upper (HUC 080102030603)

Cited to the EPA ICIS-NPDES permit file (ECHO download).

Effluent limits and exceedances

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 measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
Nitrogen, ammonia total [as N]10281279July 31, 20263,338% over the limit
BOD, carbonaceous [5 day, 20 C]12111102April 30, 2026380% over the limit
IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubia22927November 30, 202598% over the limit
Zinc, total recoverable02626February 28, 2014160% over the limit
Chlorine, total residual12019July 31, 20261,800% over the limit
BOD, carbonaceous, percent removal21212April 30, 2026267% over the limit
Solids, suspended percent removal21311March 31, 202673% over the limit
IC25 Static Renewal 7 Day Chronic Chrpimephales21311November 30, 202592% over the limit
Carbonaceous oxygen demand, % removal01311March 31, 201699,999% over the limit
E. coli21111May 31, 2026325% over the limit
Phosphorus, total [as P]3108June 30, 2026211% over the limit
pH2108June 30, 2026
Solids, total suspended7156July 31, 2025264% over the limit
Copper, dissolved [as Cu]095January 31, 201192% over the limit
Coliform, fecal MF, MFC broth, 44.5 C075September 30, 200486% over the limit
Cyanide, total [as CN]155March 31, 2023666% over the limit
Nitrogen, total [as N]344June 30, 2026126% over the limit
E. coli, MTEC-MF044March 31, 2020213% over the limit
Silver, total [as Ag]033December 31, 201522% over the limit
Zinc, dissolved [as Zn]042March 31, 200515% over the limit
Oxygen, dissolved [DO]132March 31, 202616% over the limit
Mercury, total [as Hg]032July 31, 20091,900% over the limit
SSO, Wet Weather122March 31, 20252,147,483,650% over the limit
IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia022May 31, 202675% over the limit
IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas022May 31, 202650% over the limit
Solids, settleable121September 30, 200114,900% over the limit
Flow, in conduit or thru treatment plant440
Overflows020
Bypass valve010
SSO, Dry Weather100

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

DateWhat EPA recordedAgency
March 14, 2023Pretreatment - Failure to Enforce Against I/UST6
February 21, 2018Pretreatment - 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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How we handle your data → Privacy

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 TN0020613 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.