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 (October 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)
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

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

How we handle your data → Privacy

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 October 14, 2026.

This public-records page covers the NPDES discharge permit WI0020117 held by the Village of Rio for the Rio Wastewater Treatment Facility in Rio, WI, which discharges to Rocky Run Via Un in the Headwaters Rocky Run subwatershed (HUC 070700050103). The page lists the permit as administratively continued, a Minor discharger class 3 under the Publicly owned treatment works program, with 2 pollutants under a numeric limit and 2 pollutants with an effluent exceedance. EPA's file shows the permit issued June 28, 2013 and expiring June 30, 2018.