Clean Water Act discharge permit · NPDES WI0031194
LAKE MILLS WASTEWATER TREATMENT FACILITY, Lake Mills, WI: NPDES WI0031194 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 11Pollutants under a numeric limit
- 6Pollutants with an effluent exceedance
LAKE MILLS WASTEWATER TREATMENT FACILITY, held by LAKE MILLS WASTEWATER TREATMEN, holds NPDES permit WI0031194, which discharges to Rock Cr. EPA’s file records it issued March 31, 2010 and expiring March 31, 2015. 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 | LAKE MILLS WASTEWATER TREATMENT FACILITY |
|---|---|
| Permittee as filed | LAKE MILLS WASTEWATER TREATMEN |
| NPDES ID | WI0031194 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | March 31, 2010 |
| Expiration date | March 31, 2015 |
| Address | Lake Mills, WI 53551 |
| Receiving water | ROCK CR |
| Subwatershed | Rock Creek (HUC 070900011003) |
| Program components on file | Biosolids, POTW |
| 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
- 14Pollutants on file
- 11Under a numeric limit
- 13With a violation of any kind
- 6With 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 | 12 | 42 | 14 | March 31, 2022 | 52% over the limit |
| BOD, 5-day, 20 deg. C | 12 | 44 | 11 | March 31, 2016 | 54% over the limit |
| Chlorine, total residual | 3 | 10 | 5 | September 30, 2022 | 1,795% over the limit |
| Oxygen, dissolved [DO] | 1 | 11 | 2 | July 31, 2001 | 7% over the limit |
| Coliform, fecal general | 1 | 47 | 1 | September 30, 2006 | 105% over the limit |
| Phosphorus, total [as P] | 2 | 1 | 1 | June 30, 2023 | 4% over the limit |
| Nitrogen, total [as N] | 0 | 33 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 0 | 33 | 0 | ||
| Nitrite + Nitrate total [as N] | 0 | 33 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 24 | 0 | ||
| Nitrogen, ammonia total [as N] | 8 | 15 | 0 | ||
| pH | 2 | 6 | 0 | ||
| Chloride [as Cl] | 1 | 2 | 0 | ||
| Mercury, total recoverable | 2 | 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
- 6Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| August 9, 2024 | WW SSO - Discharge to Waters | ST6 |
| February 5, 2024 | WW SSO - Discharge to Waters | ST6 |
| September 15, 2022 | WW SSO - Discharge to Waters | ST6 |
| September 13, 2022 | WW SSO - Discharge to Waters | ST6 |
| July 13, 2020 | WW SSO - Discharge to Waters | ST6 |
| November 18, 2017 | 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.
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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 WI0031194 there.
Nearby on the register
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- Every permit record in Wisconsin, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.