Clean Water Act discharge permit · NPDES WI0022471

WALDO WASTEWATER UTILITY, Waldo, WI: NPDES WI0022471 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
6Pollutants under a numeric limit
4Pollutants with an effluent exceedance

WALDO WASTEWATER UTILITY, held by Waldo Wastewater Utility, holds NPDES permit WI0022471, which discharges to Onion R. EPA’s file records it issued January 23, 2014 and expiring December 31, 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	WALDO WASTEWATER UTILITY
Permittee as filed	Waldo Wastewater Utility
NPDES ID	WI0022471
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	January 23, 2014
Expiration date	December 31, 2018
Address	Waldo, WI 53093
Receiving water	ONION R
Subwatershed	Upper Onion River (HUC 040301011001)
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

9Pollutants on file
6Under a numeric limit
9With 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	38	10	September 30, 2025	39% over the limit
Chlorine, total residual	0	3	3	June 30, 1989	16% over the limit
Solids, total suspended	4	69	1	September 30, 2022	26% over the limit
pH	2	35	1	February 28, 2023
BOD, 5-day, 20 deg. C	4	68	0
Coliform, fecal general	0	55	0
Nitrogen, ammonia total [as N]	1	39	0
Flow, in conduit or thru treatment plant	2	34	0
Chloride [as Cl]	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

2Single-event violations

Date	What EPA recorded	Agency
May 17, 2020	WW SSO - Discharge to Waters	ST6
October 2, 2019	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 WI0022471 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

This public-records page covers Clean Water Act discharge permit NPDES WI0022471, held by Waldo Wastewater Utility for its Waldo, WI facility, which discharges to the Onion R and is administratively continued past its December 31, 2018 expiration. The page lists 6 for the discharger class, 4 pollutants under a numeric limit, and 4 pollutants with an effluent exceedance.