Clean Water Act discharge permit · NPDES WI0020117
RIO WASTEWATER TREATMENT FACILITY, Rio, WI: NPDES WI0020117 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 3Pollutants under a numeric limit
- 2Pollutants with an effluent exceedance
RIO WASTEWATER TREATMENT FACILITY, held by VILLAGE OF RIO, holds NPDES permit WI0020117, which discharges to Rocky Run Via Un. EPA’s file records it issued June 28, 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 | RIO WASTEWATER TREATMENT FACILITY |
|---|---|
| Permittee as filed | VILLAGE OF RIO |
| NPDES ID | WI0020117 |
| 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 | June 28, 2013 |
| Expiration date | June 30, 2018 |
| Address | Rio, WI 53960 |
| Receiving water | ROCKY RUN VIA UN |
| Subwatershed | Headwaters Rocky Run (HUC 070700050103) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 16Pollutants on file
- 3Under a numeric limit
- 16With a violation of any kind
- 2With 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 | 2 | 38 | 2 | November 30, 2024 | 581% over the limit |
| pH | 0 | 10 | 2 | November 30, 2022 | |
| Solids, total suspended | 2 | 36 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 32 | 0 | ||
| Nitrogen, ammonia total [as N] | 0 | 12 | 0 | ||
| Chloride [as Cl] | 0 | 12 | 0 | ||
| Oxygen, dissolved [DO] | 0 | 4 | 0 | ||
| Phosphorus, total [as P] | 0 | 4 | 0 | ||
| Nitrogen, total [as N] | 0 | 1 | 0 | ||
| Nitrite + Nitrate total [as N] | 0 | 1 | 0 | ||
| Arsenic, total recoverable | 0 | 1 | 0 | ||
| Nickel, total recoverable | 0 | 1 | 0 | ||
| Zinc, total recoverable | 0 | 1 | 0 | ||
| Cadmium, total recoverable | 0 | 1 | 0 | ||
| Lead, total recoverable | 0 | 1 | 0 | ||
| Chromium, total recoverable | 0 | 1 | 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 WI0020117.
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, WI0020117.
Start the watch
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- One watershed — $2,990/year
- One state — $4,990/year
- The whole register — $18,000/year
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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 WI0020117 there.
Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.