Clean Water Act discharge permit · NPDES WI0031925
LARSEN WINCHESTER SD WW TRTMNT, Larsen, WI: NPDES WI0031925 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 5Pollutants under a numeric limit
- 4Pollutants with an effluent exceedance
LARSEN WINCHESTER SD WW TRTMNT, held by LARSEN WINCHESTER SD WWTF, holds NPDES permit WI0031925, which discharges to Arrowhead Cr. EPA’s file records it issued December 23, 2003 and expiring December 31, 2008. 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 | LARSEN WINCHESTER SD WW TRTMNT |
|---|---|
| Permittee as filed | LARSEN WINCHESTER SD WWTF |
| NPDES ID | WI0031925 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | December 23, 2003 |
| Expiration date | December 31, 2008 |
| Address | Larsen, WI |
| Receiving water | ARROWHEAD CR |
| Subwatershed | Arrowhead River (HUC 040302022105) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 7Pollutants on file
- 5Under a numeric limit
- 5With a violation of any kind
- 4With 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 |
|---|---|---|---|---|---|
| Solids, total suspended | 2 | 35 | 3 | April 30, 1992 | 83% over the limit |
| Oxygen, dissolved [DO] | 0 | 2 | 2 | April 30, 1991 | 5% over the limit |
| pH | 0 | 2 | 2 | April 30, 1990 | |
| BOD, 5-day, 20 deg. C | 2 | 33 | 1 | April 30, 1989 | 20% over the limit |
| Flow, in conduit or thru treatment plant | 2 | 32 | 0 | ||
| Nitrogen, ammonia total [as N] | 1 | 0 | 0 | ||
| Phosphorus, total [as P] | 1 | 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
- 1Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| July 1, 2023 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
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, WI0031925.
Start the watch
- 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 WI0031925 there.
Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.