Clean Water Act discharge permit · NPDES WI0023931
ELROY WASTEWATER TREATMENT FACILITY, Elroy, WI: NPDES WI0023931 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 0Pollutants under a numeric limit
- 2Pollutants with an effluent exceedance
ELROY WASTEWATER TREATMENT FACILITY, held by ELROY WASTEWATER TREATMENT FAC, holds NPDES permit WI0023931, which discharges to Baraboo R. EPA’s file records it issued May 29, 2007 and expiring March 31, 2012. 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 | ELROY WASTEWATER TREATMENT FACILITY |
|---|---|
| Permittee as filed | ELROY WASTEWATER TREATMENT FAC |
| NPDES ID | WI0023931 |
| 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 | May 29, 2007 |
| Expiration date | March 31, 2012 |
| Address | Elroy, WI 53929 |
| Receiving water | BARABOO R |
| Subwatershed | City of Elroy-Baraboo River (HUC 070700040108) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 6Pollutants on file
- 0Under a numeric limit
- 6With a violation of any kind
- 2With 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 | 0 | 99 | 43 | September 30, 2018 | 99,999% over the limit |
| BOD, 5-day, 20 deg. C | 0 | 96 | 40 | June 30, 1992 | 99,999% over the limit |
| Flow, in conduit or thru treatment plant | 0 | 56 | 0 | ||
| pH | 0 | 28 | 0 | ||
| Phosphorus, total [as P] | 0 | 14 | 0 | ||
| Coliform, fecal general | 0 | 2 | 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
- 5Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| July 1, 2023 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
| August 3, 2021 | Monitoring Violations - Analysis not Conducted | ST6 |
| May 29, 2019 | WW SSO - Discharge to Waters | ST6 |
| September 3, 2018 | WW SSO - Discharge to Waters | ST6 |
| August 28, 2018 | WW SSO - Discharge to Waters | 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
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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 WI0023931 there.
Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.