Clean Water Act discharge permit · NPDES WI0024988
OAKFIELD WWTF, Oakfield, WI: NPDES WI0024988 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 0Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
OAKFIELD WWTF, held by OAKFIELD WASTEWATER TREATMENT, holds NPDES permit WI0024988, which discharges to Fond Du Lac R E. EPA’s file records it issued June 19, 2006 and expiring June 30, 2011. 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 | OAKFIELD WWTF |
|---|---|
| Permittee as filed | OAKFIELD WASTEWATER TREATMENT |
| NPDES ID | WI0024988 |
| 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 19, 2006 |
| Expiration date | June 30, 2011 |
| Address | Oakfield, WI 53065 |
| Receiving water | FOND DU LAC R E |
| Subwatershed | Sevenmile Creek-East Branch Fond Du Lac River (HUC 040302030202) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 10Pollutants on file
- 0Under a numeric limit
- 10With 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 | 0 | 121 | 30 | April 30, 2026 | 99,999% over the limit |
| Chlorine, total residual | 0 | 32 | 11 | May 31, 2023 | 716% over the limit |
| Nitrogen, ammonia total [as N] | 0 | 44 | 4 | January 31, 2024 | 10% over the limit |
| pH | 0 | 30 | 4 | November 30, 2023 | |
| Phosphorus, total [as P] | 0 | 14 | 1 | October 31, 2025 | 14% over the limit |
| Coliform, fecal general | 0 | 44 | 0 | ||
| Solids, total suspended | 0 | 26 | 0 | ||
| Flow, in conduit or thru treatment plant | 0 | 26 | 0 | ||
| Oxygen, dissolved [DO] | 0 | 13 | 0 | ||
| Chloride [as Cl] | 0 | 13 | 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
- 2Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| June 22, 2024 | WW SSO - Discharge to Waters | ST6 |
| 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.
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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 WI0024988 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.