Clean Water Act discharge permit · NPDES WI0021741
DENMARK WASTEWATER TREATMENT F, Denmark, WI: NPDES WI0021741 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 7Pollutants under a numeric limit
- 6Pollutants with an effluent exceedance
DENMARK WASTEWATER TREATMENT F holds NPDES permit WI0021741, which discharges to Denmark Cr. EPA’s file records it issued July 31, 2006 and expiring June 30, 2011. 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 | DENMARK WASTEWATER TREATMENT F |
|---|---|
| Permittee as filed | DENMARK WASTEWATER TREATMENT F |
| NPDES ID | WI0021741 |
| 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 | July 31, 2006 |
| Expiration date | June 30, 2011 |
| Address | Denmark, WI 54208 |
| Receiving water | DENMARK CR |
| Subwatershed | Neshota River (HUC 040301010203) |
| 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
- 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 |
|---|---|---|---|---|---|
| Chloride [as Cl] | 2 | 139 | 105 | February 28, 2026 | 152% over the limit |
| Solids, total suspended | 4 | 83 | 15 | February 28, 2026 | 50% over the limit |
| Nitrogen, ammonia total [as N] | 0 | 43 | 10 | April 30, 2026 | 108% over the limit |
| BOD, 5-day, 20 deg. C | 4 | 75 | 7 | May 31, 2025 | 710% over the limit |
| pH | 2 | 41 | 7 | May 31, 2026 | |
| Phosphorus, total [as P] | 2 | 25 | 2 | September 30, 2024 | 11% over the limit |
| Flow, in conduit or thru treatment plant | 4 | 68 | 0 | ||
| Temperature, water deg. fahrenheit | 0 | 20 | 0 | ||
| Oxygen, dissolved [DO] | 1 | 17 | 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 |
|---|---|---|
| June 22, 2024 | WW SSO - Discharge to Waters | ST6 |
| May 26, 2024 | WW SSO - Discharge to Waters | ST6 |
| March 31, 2023 | WW SSO - Discharge to Waters | ST6 |
| August 10, 2021 | WW SSO - Discharge to Waters | ST6 |
| August 8, 2021 | WW SSO - Discharge to Waters | ST6 |
| July 14, 2021 | 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
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, WI0021741.
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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 WI0021741 there.
Nearby on the register
- Discharge permits in Denmark
- Every permit record in Denmark, A to Z
- Discharge permits in Wisconsin
- Every permit record in Wisconsin, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.