Velarion Records
Follow this permit Velarion Records emails you this permit’s record, cited to the public filing, and tells you when the register changes it. Free.
We’ll email you a link to confirm. The continuous daily watch on every change is the paid alert. Unsubscribe any time.
Also free: The Pay Desk, the weekly executive pay briefing.

Clean Water Act discharge permit · NPDES IL0031488

TROY STP, CITY OF, Troy, IL: NPDES IL0031488 discharge permit, effluent exceedances, inspections, penalties

TROY STP, CITY OF, held by TROY, CITY OF, holds NPDES permit IL0031488, which discharges to Troy Creek, Wendell Branch. EPA’s file records it issued September 23, 2020 and expiring September 30, 2025. 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 filedTROY STP, CITY OF
Permittee as filedTROY, CITY OF
NPDES IDIL0031488
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
IssuedSeptember 23, 2020
Expiration dateSeptember 30, 2025
AddressTroy, IL 62294
Receiving waterTROY CREEK, WENDELL BRANCH
SubwatershedWendell Branch-Silver Creek (HUC 071402040506)
Program components on fileBiosolids, POTW, Pretreatment
SIC4952 – 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

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
Copper, total [as Cu]6152148December 31, 2022124% over the limit
Solids, total suspended82616May 31, 2013533% over the limit
BOD, 5-day, 20 deg. C4119June 30, 2013337% over the limit
Coliform, fecal general165July 31, 201699,999% over the limit
Fluoride, total [as F]242October 31, 200650% over the limit
Chlorine, total residual2460
BOD, carbonaceous [5 day, 20 C]480
Flow, in conduit or thru treatment plant450
Nitrogen, ammonia total [as N]1740
pH640
Oxygen, dissolved [DO]610
Phosphorus, total [as P]310
Zinc, total [as Zn]210
Flow, total210
Oil & Grease200
Cyanide, total [as CN]200
Cyanide, free [amenable to chlorination]200
Arsenic, total [as As]200
Barium, total [as Ba]200
Cadmium, total [as Cd]200
Chromium, hexavalent [as Cr]200
Chromium, total [as Cr]200
Iron, total [as Fe]200
Iron, dissolved [as Fe]200
Lead, total [as Pb]200
Manganese, total [as Mn]200
Nickel, total [as Ni]200
Silver, total [as Ag]200
Selenium, total [as Se]200
Phenolics, total recoverable200
Mercury, total [as Hg]200
Nitrogen, total [as N]100

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
September 8, 2026Dry-weather SSO discharge to waters of the U.S. that may endanger health or the environmentEP6
July 21, 2025Wet-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangermentST6
April 19, 2025Wet-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangermentST6
April 5, 2025Wet-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangermentST6
April 5, 2025Wet-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangermentST6
April 4, 2025Wet-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangermentST6
April 4, 2025Wet-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangermentST6
April 4, 2025Wet-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangermentST6
April 4, 2025Wet-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangermentST6
April 4, 2025Wet-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangermentST6
April 4, 2025Wet-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangermentST6
April 4, 2025Wet-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangermentST6
April 4, 2025Wet-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangermentST6
December 4, 2024Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environmentST6
November 5, 2024Wet-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangermentST6
November 5, 2024Wet-weather unanticipated prohibited bypass discharge to waters of the U.S. - endangermentST6

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, IL0031488.

Start the watch

How often?
  • One permit holder — $99/month
  • One watershed — $2,990/year
  • One state — $4,990/year
  • The whole register — $18,000/year

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 IL0031488 there.

Nearby on the register

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

What this page shows

This page covers the Clean Water Act NPDES discharge permit IL0031488 held by TROY, CITY OF for the TROY STP, CITY OF facility in Troy, IL, which discharges to TROY CREEK, WENDELL BRANCH within the Wendell Branch-Silver Creek subwatershed (HUC 071402040506). The permit is listed as administratively continued and as a Major discharger, with 5 pollutants under a numeric limit and 5 pollutants with an effluent exceedance.