Clean Water Act discharge permit · NPDES WI0023655
COLBY WASTEWATER TREATMENT FAC, Colby, WI: NPDES WI0023655 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 8Pollutants under a numeric limit
- 1Pollutants with an effluent exceedance
COLBY WASTEWATER TREATMENT FAC, held by COLBY CITY WWTF, holds NPDES permit WI0023655, which discharges to Dill Cr. EPA’s file records it issued November 1, 2012 and expiring September 30, 2017. 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 | COLBY WASTEWATER TREATMENT FAC |
|---|---|
| Permittee as filed | COLBY CITY WWTF |
| NPDES ID | WI0023655 |
| 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 | November 1, 2012 |
| Expiration date | September 30, 2017 |
| Address | Colby, WI 54421 |
| Receiving water | DILL CR |
| Subwatershed | Dill Creek (HUC 070700021504) |
| 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
- 8Pollutants on file
- 8Under a numeric limit
- 8With a violation of any kind
- 1With 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 | 4 | 26 | 2 | February 28, 2018 | 12% over the limit |
| Copper, total recoverable | 1 | 36 | 0 | ||
| Solids, total suspended | 4 | 24 | 0 | ||
| Flow, in conduit or thru treatment plant | 4 | 24 | 0 | ||
| pH | 2 | 12 | 0 | ||
| Oxygen, dissolved [DO] | 1 | 6 | 0 | ||
| Phosphorus, total [as P] | 1 | 6 | 0 | ||
| Chloride [as Cl] | 1 | 6 | 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
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES WI0023655.
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
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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 WI0023655 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.