Clean Water Act discharge permit · NPDES WI0025038

OSHKOSH WASTEWATER TREATMENT PLANT, Oshkosh, WI: NPDES WI0025038 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MajorDischarger class
16Pollutants under a numeric limit
3Pollutants with an effluent exceedance

OSHKOSH WASTEWATER TREATMENT PLANT, held by City of Oshkosh, holds NPDES permit WI0025038, which discharges to Fox River. EPA’s file records it issued June 24, 2013 and expiring June 30, 2018. 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 filed	OSHKOSH WASTEWATER TREATMENT PLANT
Permittee as filed	City of Oshkosh
NPDES ID	WI0025038
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Individual permit
Discharger class	Major discharger
Facility type	Publicly owned treatment works
Program	Publicly owned treatment works
Issued	June 24, 2013
Expiration date	June 30, 2018
Address	Oshkosh, WI 54901
Receiving water	FOX RIVER
Receiving water impaired	303(D) Listed
Subwatershed	Lake Butte des Mortes-Fox River (HUC 040302011205)
Program components on file	Biosolids, POTW, Pretreatment
SIC	4952 – 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

16Pollutants on file
16Under a numeric limit
5With a violation of any kind
3With an effluent exceedance

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 measure	Limits	Violations, any kind	Effluent exceedances	Latest exceedance	Largest exceedance, as filed
Phosphorus, total [as P]	4	73	73	June 30, 2026	465% over the limit
Chlorine, total residual	2	6	6	October 31, 2018	889% over the limit
Mercury, total recoverable	2	173	1	October 31, 2016	33% over the limit
Coliform, fecal general	1	98	0
Nitrogen, ammonia total [as N]	10	8	0
Flow, in conduit or thru treatment plant	6	0	0
Solids, total suspended	5	0	0
BOD, carbonaceous [5 day, 5 C]	3	0	0
BOD, 5-day, 20 deg. C	2	0	0
pH	2	0	0
Nickel, total recoverable	2	0	0
Zinc, total recoverable	2	0	0
Cadmium, total recoverable	2	0	0
Lead, total recoverable	2	0	0
Chromium, total recoverable	2	0	0
Copper, total recoverable	2	0	0

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

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES WI0025038.

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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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 WI0025038 there.

Nearby on the register

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

This public-records page covers the Clean Water Act discharge permit NPDES WI0025038 for the Oshkosh Wastewater Treatment Plant in Oshkosh, WI, held by City of Oshkosh and discharging to the Fox River. The permit is listed as administratively continued, with a Major Discharger class, 16 pollutants under a numeric limit, and 3 pollutants with an effluent exceedance. The permit was issued June 24, 2013, with an expiration date of June 30, 2018, as the EPA permit file stood when the record was loaded on October 14, 2026.