Clean Water Act discharge permit · NPDES WI0021423
CASSVILLE WASTEWATER TREATMENT FACILITY, Cassville, WI: NPDES WI0021423 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 7Pollutants under a numeric limit
- 4Pollutants with an effluent exceedance
CASSVILLE WASTEWATER TREATMENT FACILITY, held by VILLAGE OF CASSVILLE, holds NPDES permit WI0021423, which discharges to Mississippi R Vi. EPA’s file records it issued February 21, 2013 and expiring March 31, 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 | CASSVILLE WASTEWATER TREATMENT FACILITY |
|---|---|
| Permittee as filed | VILLAGE OF CASSVILLE |
| NPDES ID | WI0021423 |
| 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 | February 21, 2013 |
| Expiration date | March 31, 2018 |
| Address | Cassville, WI 53806 |
| Receiving water | MISSISSIPPI R VI |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Plum Creek-Mississippi River (HUC 070600030706) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 9Pollutants on file
- 7Under 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] | 1 | 55 | 38 | August 31, 2025 | 234% over the limit |
| Chlorine, total residual | 0 | 20 | 20 | May 31, 1991 | 500% over the limit |
| Solids, total suspended | 4 | 42 | 8 | March 31, 2026 | 77% over the limit |
| pH | 2 | 35 | 1 | March 31, 1989 | |
| Coliform, fecal general | 0 | 46 | 0 | ||
| BOD, 5-day, 20 deg. C | 4 | 36 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 36 | 0 | ||
| Nitrogen, ammonia total [as N] | 1 | 0 | 0 | ||
| Chloride [as Cl] | 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
- 10Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| July 3, 2024 | WW SSO - Discharge to Waters | ST6 |
| July 1, 2024 | WW SSO - Discharge to Waters | ST6 |
| June 30, 2023 | Permit Violations - Violation Specified in Comment | ST6 |
| April 24, 2023 | WW SSO - Discharge to Waters | ST6 |
| April 23, 2023 | WW SSO - Discharge to Waters | ST6 |
| April 28, 2019 | WW SSO - Discharge to Waters | ST6 |
| April 25, 2019 | WW SSO - Discharge to Waters | ST6 |
| April 23, 2019 | WW SSO - Discharge to Waters | ST6 |
| April 4, 2019 | WW SSO - Discharge to Waters | ST6 |
| April 1, 2019 | 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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Nearby on the register
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Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.