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Clean Water Act discharge permit · NPDES IL0048755

OLNEY STP, CITY OF, Olney, IL: NPDES IL0048755 discharge permit, effluent exceedances, inspections, penalties

OLNEY STP, CITY OF, held by OLNEY, CITY OF, holds NPDES permit IL0048755, which discharges to Unnamed Ditch To Fox River. EPA’s file records it issued December 10, 2010 and expiring December 31, 2015. 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 filedOLNEY STP, CITY OF
Permittee as filedOLNEY, CITY OF
NPDES IDIL0048755
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 10, 2010
Expiration dateDecember 31, 2015
AddressOlney, IL 62450
Receiving waterUNNAMED DITCH TO FOX RIVER
SubwatershedMash Creek-Fox River (HUC 051201140605)

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]1001715April 30, 2026410% over the limit
Zinc, total [as Zn]11514April 30, 202642% over the limit
Copper, total [as Cu]11813August 31, 2003567% over the limit
Phosphorus, total [as P]21411April 30, 2025170% over the limit
Oxygen, dissolved [DO]1088April 30, 2025100% over the limit
Solids, total suspended966April 30, 2025325% over the limit
BOD, carbonaceous [5 day, 20 C]8295April 30, 2025160% over the limit
pH444September 30, 2024
Mercury, sludge, total, dry weight [as Hg]011September 30, 200982% over the limit
Chlorine, total residual250
Nitrogen, total [as N]230
Coliform, fecal general220
Cyanide, total [as CN]120
Mercury, total [as Hg]120
Oil & Grease110
Cyanide, weak acid, dissociable110
Fluoride, total [as F]110
Arsenic, total [as As]110
Barium, total [as Ba]110
Cadmium, total [as Cd]110
Chromium, hexavalent [as Cr]110
Chromium, total [as Cr]110
Iron, total [as Fe]110
Iron, dissolved [as Fe]110
Lead, total [as Pb]110
Manganese, total [as Mn]110
Nickel, total [as Ni]110
Silver, total [as Ag]110
Selenium, total [as Se]110
Phenolics, total recoverable110
Cyanide, free [amenable to chlorination]010
Flow, in conduit or thru treatment plant600
BOD, 5-day, 20 deg. C100
Ann. amt sludge disposed by other method100
Annual amt of sludge incinerated100
Annual sludge production, total100
Annual amount of sludge land applied100
Annual amt. sludge disposed surface unit100
Annual amt sludge disposed in landfill100
Annual amt sludge transported interstate100

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
April 19, 2025Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environmentST6
April 19, 2025Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environmentST6
April 11, 2025Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environmentST6
April 5, 2025Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environmentST6
April 5, 2025Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environmentST6
April 5, 2025Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environmentST6
April 5, 2025Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environmentST6

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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Nearby on the register

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

What this page shows

This public-records page covers NPDES permit IL0048755 for OLNEY STP, CITY OF in Olney, IL, a major discharger whose permit is administratively continued after its December 31, 2015 expiration. The facts list 40 pollutants on file, 38 under a numeric limit, 31 with a violation of any kind, and 9 with an effluent exceedance, with the status as of September 15, 2026.