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Clean Water Act discharge permit · NPDES IL0028380

DOWNERS GROVE S.D. - WASTEWATER TREATMENT CENTER, Downers Grove, IL: NPDES IL0028380 discharge permit, effluent exceedances, inspections, penalties

DOWNERS GROVE S.D. - WASTEWATER TREATMENT CENTER, held by DOWNERS GROVE SANITARY DISTRICT, holds NPDES permit IL0028380, which discharges to East Branch Of Dupage River & St. Joseph Creek. EPA’s file records it issued July 31, 2015 and expiring July 31, 2020. 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 filedDOWNERS GROVE S.D. - WASTEWATER TREATMENT CENTER
Permittee as filedDOWNERS GROVE SANITARY DISTRICT
NPDES IDIL0028380
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
IssuedJuly 31, 2015
Expiration dateJuly 31, 2020
AddressDowners Grove, IL 60515
Receiving waterEAST BRANCH OF DUPAGE RIVER & ST. JOSEPH CREEK
Receiving water impaired303(D) Listed
SubwatershedEast Branch Du Page River (HUC 071200040804)
Other EPA IDs (FRS)RCRA handler ILD000672071

Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.

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
Coliform, fecal general43332August 31, 202599,999% over the limit
Solids, total suspended132121June 30, 2021636% over the limit
Nitrogen, ammonia total [as N]54123October 31, 2024230% over the limit
BOD, 5-day, 20 deg. C942December 31, 201013% over the limit
BOD, carbonaceous [5 day, 20 C]422February 29, 200840% over the limit
Chlorine, total residual511April 30, 2016440% over the limit
pH820
Flow, total520
Oxygen, dissolved [DO]1000
Phosphorus, total [as P]700
Flow, in conduit or thru treatment plant400
Oil & Grease200
Nitrogen, total [as N]200
Cyanide, total [as CN]200
Fluoride, total [as F]200
Arsenic, total [as As]200
Barium, total [as Ba]200
Beryllium, total [as Be]200
Cadmium, total [as Cd]200
Chromium, hexavalent [as Cr]200
Chromium, total [as Cr]200
Copper, total [as Cu]200
Iron, total [as Fe]200
Iron, dissolved [as Fe]200
Lead, total [as Pb]200
Manganese, total [as Mn]200
Thallium, total [as Tl]200
Nickel, total [as Ni]200
Silver, total [as Ag]200
Zinc, total [as Zn]200
Antimony, total [as Sb]200
Selenium, total [as Se]200
Phenolics, total recoverable200
Mercury, total [as Hg]200
Temperature, water deg. fahrenheit100
Alkalinity, total [as CaCO3]100
Nitrogen, Kjeldahl, total [as N]100
Nitrite + Nitrate total [as N]100
Phosphorus, dissolved100
Cyanide, weak acid, dissociable100
Cyanide, free [amenable to chlorination]100
Chloride [as Cl]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
August 11, 2026Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environmentST6
August 9, 2026Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environmentST6
August 1, 2026Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environmentST6
August 1, 2026Wet-weather SSO, no discharge to waters of the U.S., that may endanger health or the environmentST6
August 1, 2026Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environmentST6
August 1, 2026Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environmentST6
July 28, 2026Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environmentST6
June 3, 2026Dry-weather SSO discharge to waters of the U.S. that may endanger health or the environmentST6
March 15, 2026Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environmentST6
August 18, 2025Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environmentST6
August 18, 2025Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environmentST6
August 18, 2025Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environmentST6
February 25, 2025Dry-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 the NPDES IL0028380 Clean Water Act discharge permit held by DOWNERS GROVE SANITARY DISTRICT for the DOWNERS GROVE S.D. - WASTEWATER TREATMENT CENTER in Downers Grove, IL. The register lists the permit as administratively continued and classed as a Major Discharger, with 6 pollutants under a numeric limit and 6 pollutants with an effluent exceedance, and it shows the permit as issued July 31, 2015 and expiring July 31, 2020.