Clean Water Act discharge permit · NPDES MI0021334

LUDINGTON WWTP, Ludington, MI: NPDES MI0021334 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MajorDischarger class
31Pollutants under a numeric limit
11Pollutants with an effluent exceedance

LUDINGTON WWTP, held by City of Ludington, holds NPDES permit MI0021334, which discharges to Pere Marquette River. EPA’s file records it issued September 24, 2015 and expiring September 30, 2020. 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	LUDINGTON WWTP
Permittee as filed	City of Ludington
NPDES ID	MI0021334
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	September 24, 2015
Expiration date	September 30, 2020
Issuing agency	State
Address	Ludington, MI 49431
Receiving water	Pere Marquette River
Subwatershed	Pere Marquette Lake-Pere Marquette River (HUC 040601010509)

Cited to the EPA ICIS-NPDES permit file (ECHO download).

Effluent limits and exceedances

36Pollutants on file
31Under a numeric limit
34With a violation of any kind
11With 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
Nitrogen, ammonia total [as N]	11	49	42	June 30, 2018	188% over the limit
Copper, total [as Cu]	8	37	25	July 31, 2021	500% over the limit
Solids, suspended percent removal	4	32	25	April 30, 2020	60% over the limit
Mercury, total [as Hg]	12	27	12	September 30, 2022	24% over the limit
Phosphorus, total [as P]	8	28	8	July 31, 2025	34% over the limit
Solids, total suspended	8	46	6	February 28, 2025	60% over the limit
Chlorine, total residual	2	15	6	November 30, 2025	532% over the limit
pH	4	26	5	April 30, 2019
Coliform, fecal general	4	23	3	January 31, 2026	40% over the limit
BOD, carbonaceous [5 day, 20 C]	16	42	2	February 29, 2016	72% over the limit
Toxicity [chronic], Ceriodaphnia dubia	0	8	2	August 31, 2006	38% over the limit
Toxicity, choice of species	4	54	0
Toxicity [acute], Ceriodaphnia dubia	2	27	0
Perfluorooctanoic acid (PFOA)	0	24	0
Flow, in conduit or thru treatment plant	4	20	0
BOD, carb-5 day, 20 deg C, percent removal	4	10	0
Oxygen, dissolved [DO]	3	10	0
Perfluorooctanesulfonate	0	8	0
Solids, total	3	6	0
Arsenic, dry weight	3	6	0
Selenium, dry weight	3	6	0
Copper, dry weight	3	6	0
Cadmium, dry weight	3	6	0
Nitrogen, total Kjeldahl	3	6	0
Molybdenum, sludge, total, dry weight [as Mo]	3	6	0
Zinc, sludge, total, dry weight [as Zn]	3	6	0
Lead, sludge, total, dry weight [as Pb]	3	6	0
Nickel, sludge, total, dry weight [as Ni]	3	6	0
Nitrogen, sludge, total, dry weight [as N]	3	6	0
Mercury, sludge, total, dry weight [as Hg]	3	6	0
Potassium, sludge, total, dry weight [as K]	3	6	0
Phosphorus, sludge, total, dry weight [as P]	3	6	0
Toxicity, final conc toxicity units	0	5	0
Cadmium, total [as Cd]	0	1	0
Static 48 Hr Chronic Pimphales Promelas	2	0	0
TU Static 24 Hr Acute Pimephales promelas	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

10Single-event violations

Date	What EPA recorded	Agency
October 25, 2024	Monitoring Violations - Analysis not Conducted	ST6
October 3, 2022	Monitoring Violations - Failure to Monitor for Non-Toxicity Requirements	ST6
December 8, 2021	Pretreatment - Failure to Develop/Enforce Standards	ST6
December 8, 2021	Failure to enforce standards, local limits, and reporting requirements (>15% SNC SIU) (Level II)	ST6
December 2, 2019	Monitoring Violations - Failure to Monitor for Non-Toxicity Requirements	ST6
December 2, 2019	Monitoring Violations - Invalid/Unrepresentative Sample	ST6
August 9, 2017	Pretreatment - Failure to Establish Local Limits	ST6
August 9, 2017	Pretreatment - Failure to Enforce Against I/U	ST6
August 9, 2017	Failure to issue/reissue control mechanisms to at least 90% of SIU/CIUs w/in 6 months (Level II)	ST6
August 9, 2017	Failure to enforce standards, local limits, and reporting requirements (>15% SNC SIU) (Level II)	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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Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.