Clean Water Act discharge permit · NPDES WI0031381
ASHIPPUN SANITARY DISTRICT WWTF, Ashippun, WI: NPDES WI0031381 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 7Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
ASHIPPUN SANITARY DISTRICT WWTF, held by ASHIPPUN SANITARY DISTRICT, holds NPDES permit WI0031381, which discharges to Rock R. EPA’s file records it issued June 28, 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 | ASHIPPUN SANITARY DISTRICT WWTF |
|---|---|
| Permittee as filed | ASHIPPUN SANITARY DISTRICT |
| NPDES ID | WI0031381 |
| 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 | June 28, 2013 |
| Expiration date | June 30, 2018 |
| Address | Ashippun, WI 53003 |
| Receiving water | ROCK R |
| Subwatershed | Mud Creek-Rock River (HUC 070900010604) |
| 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
- 9Pollutants on file
- 7Under a numeric limit
- 9With a violation of any kind
- 5With 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 |
|---|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | 4 | 84 | 16 | April 30, 2024 | 862% over the limit |
| Solids, total suspended | 2 | 55 | 11 | May 31, 2025 | 99,999% over the limit |
| Chlorine, total residual | 0 | 7 | 7 | August 31, 1989 | 229% over the limit |
| Oxygen, dissolved [DO] | 0 | 3 | 3 | August 31, 1989 | 42% over the limit |
| pH | 2 | 35 | 1 | May 31, 2025 | |
| Phosphorus, total [as P] | 3 | 66 | 0 | ||
| Flow, in conduit or thru treatment plant | 4 | 46 | 0 | ||
| Nitrogen, ammonia total [as N] | 1 | 6 | 0 | ||
| Chloride [as Cl] | 1 | 1 | 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 WI0031381.
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 WI0031381 there.
Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.