Clean Water Act discharge permit · NPDES WI0002381

WPL NELSON DEWEY GENERATING STATION, Cassville, WI: NPDES WI0002381 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
0Pollutants under a numeric limit
0Pollutants with an effluent exceedance

WPL NELSON DEWEY GENERATING STATION, held by Wisconsin Power & Light Nelson Dewey Station, holds NPDES permit WI0002381, which discharges to Mississippi R. EPA’s file records it issued December 20, 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 filed	WPL NELSON DEWEY GENERATING STATION
Permittee as filed	Wisconsin Power & Light Nelson Dewey Station
NPDES ID	WI0002381
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Individual permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Issued	December 20, 2010
Expiration date	December 31, 2015
Address	Cassville, WI 53806
Receiving water	MISSISSIPPI R
Receiving water impaired	303(D) Listed
Subwatershed	Plum Creek-Mississippi River (HUC 070600030706)
Other EPA IDs (FRS)	RCRA handler WID044666840; ICIS-AIR source WI0000005504300001

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

Effluent limits and exceedances

9Pollutants on file
0Under a numeric limit
9With a violation of any kind
0With 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
Flow, in conduit or thru treatment plant	0	36	0
Solids, total suspended	0	12	0
Oil and grease, hexane extr method	0	12	0
Magnesium, total recoverable	0	6	0
Iron, total recoverable	0	6	0
Barium, total [as Ba]	0	6	0
Aluminum, total recoverable	0	6	0
Manganese, total recoverable	0	6	0
Mercury, total recoverable	0	6	0

EPA’s effluent violation file records no exceedance of a numeric limit for NPDES WI0002381.

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 WI0002381.

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, WI0002381.

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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 WI0002381 there.

Nearby on the register

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

The WPL NELSON DEWEY GENERATING STATION permit, filed to Wisconsin Power & Light Nelson Dewey Station, is one of 6 individual permits on EPA's NPDES register in Grant County, Wisconsin, and it sits among 5 NPDES permits in the Plum Creek-Mississippi River subwatershed. Of those 6 Grant County individual permits, 16.7% were issued earlier than this one, and 66.7% carry a violation on file, while this permit itself has no pollutant under a numeric limit and no pollutant with an effluent exceedance.