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Clean Water Act discharge permit · NPDES KY0104400

MOUNT STERLING HINKSTON CREEK STP, Mount Sterling, KY: NPDES KY0104400 discharge permit, effluent exceedances, inspections, penalties

MOUNT STERLING HINKSTON CREEK STP, held by Mount Sterling Hinkston Creek STP, holds NPDES permit KY0104400, which discharges to Hinkston Crk. EPA’s file records it issued March 26, 2018 and expiring April 30, 2023. 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 filedMOUNT STERLING HINKSTON CREEK STP
Permittee as filedMount Sterling Hinkston Creek STP
NPDES IDKY0104400
Permit statusEffective
Permit typeIndividual permit
Discharger classMajor discharger
Facility typePublicly owned treatment works
ProgramPublicly owned treatment works
IssuedMarch 26, 2018
Expiration dateApril 30, 2023
AddressMount Sterling, KY 40353
Receiving waterHINKSTON CRK
Receiving water impaired303(D) Listed
SubwatershedHeadwaters Hinkston Creek (HUC 051001020302)

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; the 60 with the most exceedances of 122 are shown.

Pollutant or measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
Phosphorus, total [as P]121717July 31, 2025310% over the limit
BOD, carbonaceous [5 day, 20 C]61815October 31, 2024296% over the limit
Coliform, fecal general01414June 30, 200799,999% over the limit
Nitrogen, ammonia total [as N]41212June 30, 2024240% over the limit
Toxicity, final conc toxicity units11310December 31, 202599,999% over the limit
Solids, total suspended666March 31, 201578% over the limit
E. coli254July 31, 2022908% over the limit
Solids, suspended percent removal133December 31, 200460% over the limit
pH221January 31, 2004
BOD, carb-5 day, 20 deg C, percent removal111January 31, 200413% over the limit
Oil & Grease600
Cyanide, free [amenable to chlorination]600
Arsenic, total recoverable600
Selenium, total recoverable600
Nickel, total recoverable600
Silver total recoverable600
Zinc, total recoverable600
Cadmium, total recoverable600
Lead, total recoverable600
Chromium, total recoverable600
Copper, total recoverable600
Mercury, total recoverable600
Nitrogen, total [as N]400
Chloride [as Cl]400
Iron, total recoverable400
Phenolics, total400
Flow, in conduit or thru treatment plant400
Chromium, hexavalent tot recoverable400
Temperature, water deg. fahrenheit200
Hardness, total [as CaCO3]200
Thallium, total recoverable200
Beryllium, total recoverable [as Be]200
Antimony, total recoverable200
Dichlorobromomethane200
Carbon tetrachloride200
1,2-Dichloroethane200
Bromoform200
Chloroform200
Toluene200
Benzene200
Acenaphthylene200
Acenaphthene200
Acrolein200
Acrylonitrile200
Anthracene200
Benzo[k]fluoranthene200
Benzo[a]pyrene200
Bis[2-chloroethyl] ether200
Bis[2-chloroethoxy]methane200
Bis[2-chloroisopropyl] ether200
Butyl benzyl phthalate200
Chlorobenzene200
Chlorodibromomethane200
Chrysene200
Diethyl phthalate200
Dimethyl phthalate200
1,2-Diphenylhydrazine200
Ethylbenzene200
Fluoranthene200
Fluorene200

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
January 30, 2026Effluent Violations - Failed Toxicity TestST6
October 16, 2025Effluent Violations - Failed Toxicity TestST6
June 26, 2025Permit Violations - Violation Specified in CommentST6
June 12, 2025Effluent Violations - Failed Toxicity TestST6
February 7, 2025Effluent Violations - Failed Toxicity TestST6
June 6, 2024Permit Violations - Violation Specified in CommentST6
May 9, 2023Permit Violations - Violation Specified in CommentST6
May 9, 2023Management Practice Violations - Improper Operation and MaintenanceST6
May 9, 2023Management Practice Violations - No Licensed/Certified OperatorST6
May 9, 2023Reporting Violations - Failure to NotifyST6

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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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 KY0104400 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.