Clean Water Act discharge permit · NPDES WI0025739
WAUSAU WATER WORKS WW TREATMENT FACILITY, Wausau, WI: NPDES WI0025739 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 18Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
WAUSAU WATER WORKS WW TREATMENT FACILITY, held by Wausau Water Works, holds NPDES permit WI0025739, which discharges to Wisconsin R. EPA’s file records it issued December 31, 2010 and expiring December 31, 2015. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | WAUSAU WATER WORKS WW TREATMENT FACILITY |
|---|---|
| Permittee as filed | Wausau Water Works |
| NPDES ID | WI0025739 |
| 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 | December 31, 2010 |
| Expiration date | December 31, 2015 |
| Address | Wausau, WI 54403 |
| Receiving water | WISCONSIN R |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Eau Claire Flowage (HUC 070700021403) |
| Other EPA IDs (FRS) | RCRA handler WID000711382 |
Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 21Pollutants on file
- 18Under a numeric limit
- 20With a violation of any kind
- 5With 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 |
|---|---|---|---|---|---|
| pH | 2 | 10 | 10 | November 30, 2021 | |
| BOD, 5-day, 20 deg. C | 5 | 20 | 8 | April 30, 2019 | 17% over the limit |
| Phosphorus, total [as P] | 2 | 9 | 6 | May 31, 2019 | 32% over the limit |
| Coliform, fecal general | 1 | 41 | 1 | August 31, 2007 | 7% over the limit |
| Mercury, total recoverable | 2 | 7 | 1 | February 28, 2021 | 1% over the limit |
| Nitrogen, ammonia total [as N] | 2 | 35 | 0 | ||
| Solids, total suspended | 5 | 12 | 0 | ||
| Flow, in conduit or thru treatment plant | 4 | 12 | 0 | ||
| Cyanide, total [as CN] | 2 | 6 | 0 | ||
| Nickel, total recoverable | 2 | 6 | 0 | ||
| Silver total recoverable | 2 | 6 | 0 | ||
| Zinc, total recoverable | 2 | 6 | 0 | ||
| Cadmium, total recoverable | 2 | 6 | 0 | ||
| Lead, total recoverable | 2 | 6 | 0 | ||
| Chromium, total recoverable | 2 | 6 | 0 | ||
| Copper, total recoverable | 2 | 6 | 0 | ||
| Nitrogen, total [as N] | 0 | 6 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 0 | 6 | 0 | ||
| Nitrite + Nitrate total [as N] | 0 | 6 | 0 | ||
| Pentachlorophenol | 1 | 1 | 0 | ||
| Hardness, total [as CaCO3] | 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
- 6Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| September 19, 2025 | WW SSO - Discharge to Waters | ST6 |
| May 1, 2024 | WW SSO - Discharge to Waters | ST6 |
| August 1, 2022 | WW SSO - Discharge to Waters | ST6 |
| May 15, 2020 | WW SSO - Discharge to Waters | ST6 |
| April 22, 2020 | WW SSO - Discharge to Waters | ST6 |
| January 23, 2018 | 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 WI0025739 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 September 15, 2026.