Clean Water Act discharge permit · NPDES WI0024643
MAYVILLE WASTEWATER TREATMENT FACILITY, Mayville, WI: NPDES WI0024643 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 10Pollutants under a numeric limit
- 4Pollutants with an effluent exceedance
MAYVILLE WASTEWATER TREATMENT FACILITY, held by CITY OF MAYVILLE, holds NPDES permit WI0024643, which discharges to Rock R E Br Uppe. EPA’s file records it issued June 4, 2013 and expiring June 30, 2018. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | MAYVILLE WASTEWATER TREATMENT FACILITY |
|---|---|
| Permittee as filed | CITY OF MAYVILLE |
| NPDES ID | WI0024643 |
| 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 | June 4, 2013 |
| Expiration date | June 30, 2018 |
| Address | Mayville, WI 53050 |
| Receiving water | ROCK R E BR UPPE |
| Subwatershed | East Branch Rock River (HUC 070900010107) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 14Pollutants on file
- 10Under a numeric limit
- 7With a violation of any kind
- 4With 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 |
|---|---|---|---|---|---|
| Phosphorus, total [as P] | 4 | 10 | 10 | April 30, 2026 | 39% over the limit |
| Mercury, total recoverable | 0 | 37 | 1 | December 31, 2022 | 1,878% over the limit |
| Solids, total suspended | 47 | 1 | 1 | September 30, 2016 | 140% over the limit |
| Oxygen, dissolved [DO] | 1 | 1 | 1 | September 30, 2016 | 12% over the limit |
| Nitrogen, total [as N] | 0 | 2 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 0 | 2 | 0 | ||
| Nitrite + Nitrate total [as N] | 0 | 2 | 0 | ||
| BOD, 5-day, 20 deg. C | 12 | 0 | 0 | ||
| Nitrogen, ammonia total [as N] | 9 | 0 | 0 | ||
| Chloride [as Cl] | 4 | 0 | 0 | ||
| Temperature, water deg. fahrenheit | 2 | 0 | 0 | ||
| pH | 2 | 0 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 0 | 0 | ||
| Coliform, fecal general | 1 | 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
- 5Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| August 10, 2025 | WW SSO - Discharge to Waters | ST6 |
| April 1, 2023 | WW SSO - Discharge to Waters | ST6 |
| July 24, 2022 | WW SSO - Discharge to Waters | ST6 |
| August 8, 2021 | WW SSO - Discharge to Waters | ST6 |
| September 7, 2017 | WW SSO - Discharge to Waters | ST6 |
Velarion’s copy of EPA’s ICIS-NPDES files does not yet 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 WI0024643 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.