Clean Water Act discharge permit · NPDES MNG585148

AUDUBON WWTP, Audubon, MN: NPDES MNG585148 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
13Pollutants under a numeric limit
2Pollutants with an effluent exceedance

AUDUBON WWTP, held by Audubon city of, holds NPDES permit MNG585148. EPA’s file records it issued January 1, 2020 and expiring November 30, 2023. 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	AUDUBON WWTP
Permittee as filed	Audubon city of
NPDES ID	MNG585148
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Coverage under a general permit
Discharger class	Minor discharger
Facility type	Publicly owned treatment works
Program	Publicly owned treatment works
Issued	January 1, 2020
Expiration date	November 30, 2023
Issuing agency	STA
Address	Audubon, MN 56511
Subwatershed	Marshall Lake (HUC 090201060105)
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

13Pollutants on file
13Under a numeric limit
13With 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
pH	3	21	6	November 30, 2025
Phosphorus, total [as P]	3	21	5	May 31, 2024	19,496,322% over the limit
Flow, in conduit or thru treatment plant	9	42	0
Solids, total suspended	5	30	0
BOD, carbonaceous [5 day, 20 C]	5	30	0
Nitrogen, total [as N]	2	10	0
Nitrogen, Kjeldahl, total [as N]	2	10	0
Nitrite + Nitrate total [as N]	2	10	0
Precipitation, total defined period/in	1	7	0
Nitrogen, ammonia total [as N]	1	7	0
Oxygen, dissolved [DO]	1	6	0
Coliform, fecal MPN + membrane ftl 44.5 C	1	5	0
Solids, total dissolved	1	5	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 MNG585148.

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 MNG585148 there.

Nearby on the register

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

This public-records page covers NPDES permit MNG585148 for the AUDUBON WWTP in Audubon, MN, held by Audubon city of and administratively continued past its November 30, 2023 expiration date. The permit file lists a Minor discharger class, 13 pollutants on file, 13 pollutants under a numeric limit, and 2 pollutants with an effluent exceedance.