Velarion Records
Follow this permit Velarion Records emails you this permit’s record, cited to the public filing, and tells you when the register changes it. Free.
We’ll email you a link to confirm. The continuous daily watch on every change is the paid alert. Unsubscribe any time.
Also free: The Pay Desk, the weekly executive pay briefing.

Clean Water Act discharge permit · NPDES MIG580315

FLAT ROCK MHP-CARLETON, Carleton, MI: NPDES MIG580315 discharge permit, effluent exceedances, inspections, penalties

FLAT ROCK MHP-CARLETON, held by Tri-Park Holdings, holds NPDES permit MIG580315. EPA’s file records it issued February 14, 2020 and expiring April 1, 2024. 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 filedFLAT ROCK MHP-CARLETON
Permittee as filedTri-Park Holdings
NPDES IDMIG580315
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeCoverage under a general permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
IssuedFebruary 14, 2020
Expiration dateApril 1, 2024
Issuing agencyState
AddressCarleton, MI 48117
SubwatershedSwan Creek (HUC 041000010104)
NAICS531190 – Lessors of Other Real Estate Property
SIC6515 – Mobile Home Site Operators

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

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 measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
Coliform, fecal general25115March 31, 2026750% over the limit
Solids, total suspended4415March 31, 2017104% over the limit
BOD, 5-day, 20 deg. C2381April 30, 20134% over the limit
Oxygen, dissolved [DO]1191October 31, 201360% over the limit
Flow, in conduit or thru treatment plant2380
pH2370
Nitrogen, ammonia total [as N]2220
Phosphorus, total [as P]2220
Solids, total330
Arsenic, dry weight330
Selenium, dry weight330
Copper, dry weight330
Cadmium, dry weight330
Nitrogen, total Kjeldahl330
Molybdenum, sludge, total, dry weight [as Mo]330
Zinc, sludge, total, dry weight [as Zn]330
Lead, sludge, total, dry weight [as Pb]330
Nickel, sludge, total, dry weight [as Ni]330
Nitrogen, sludge, total, dry weight [as N]330
Mercury, sludge, total, dry weight [as Hg]330
Potassium, sludge, total, dry weight [as K]330
Phosphorus, sludge, total, dry weight [as P]330

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

The newest 50 of 60.

DateWhat EPA recordedAgency
March 28, 2025Monitoring Violations - Failure to Monitor for Non-Toxicity RequirementsST6
March 19, 2025Monitoring Violations - Failure to Monitor for Non-Toxicity RequirementsST6
November 19, 2024Management Practice Violations - Improper Operation and MaintenanceST6
November 19, 2024Permit Violations - Discharge Without a Valid PermitST6
May 21, 2024Reporting Violations - Late Submittal of DMRsST6
December 28, 2023Management Practice Violations - Improper Operation and MaintenanceST6
December 24, 2023Management Practice Violations - Improper Operation and MaintenanceST6
December 11, 2023Management Practice Violations - Improper Operation and MaintenanceST6
December 10, 2023Management Practice Violations - Improper Operation and MaintenanceST6
December 4, 2023Management Practice Violations - Failure to Maintain RecordsST6
November 1, 2023Management Practice Violations - Improper Operation and MaintenanceST6
November 1, 2023Management Practice Violations - Failure to Maintain RecordsST6
October 17, 2023Monitoring Violations - Failure to Monitor for Non-Toxicity RequirementsST6
October 8, 2023Management Practice Violations - Improper Operation and MaintenanceST6
October 3, 2023Management Practice Violations - Improper Operation and MaintenanceST6
October 3, 2023Management Practice Violations - Failure to Maintain RecordsST6
October 1, 2023Management Practice Violations - Improper Operation and MaintenanceST6
August 2, 2023Management Practice Violations - Improper Operation and MaintenanceST6
August 2, 2023Management Practice Violations - Failure to Maintain RecordsST6
August 1, 2023Management Practice Violations - Improper Operation and MaintenanceST6
July 1, 2023Management Practice Violations - Failure to Maintain RecordsST6
June 21, 2023Reporting Violations - Late Submittal of DMRsST6
June 1, 2023Management Practice Violations - Failure to Maintain RecordsST6
May 1, 2023Management Practice Violations - Failure to Maintain RecordsST6
April 21, 2023Management Practice Violations - Failure to Maintain RecordsST6
April 13, 2023Management Practice Violations - Improper Operation and MaintenanceST6
April 13, 2023Permit Violations - Discharge Without a Valid PermitST6
April 1, 2023Management Practice Violations - Failure to Maintain RecordsST6
March 28, 2023Management Practice Violations - Improper Operation and MaintenanceST6
March 1, 2023Management Practice Violations - Failure to Maintain RecordsST6
February 1, 2023Management Practice Violations - Failure to Maintain RecordsST6
January 1, 2023Management Practice Violations - Failure to Maintain RecordsST6
December 1, 2022Management Practice Violations - Failure to Maintain RecordsST6
November 1, 2022Management Practice Violations - Failure to Maintain RecordsST6
October 1, 2022Management Practice Violations - Failure to Maintain RecordsST6
September 1, 2022Management Practice Violations - Failure to Maintain RecordsST6
August 1, 2022Management Practice Violations - Failure to Maintain RecordsST6
July 1, 2022Management Practice Violations - Failure to Maintain RecordsST6
June 1, 2022Management Practice Violations - Failure to Maintain RecordsST6
May 27, 2022Monitoring Violations - Failure to Monitor for Non-Toxicity RequirementsST6
May 24, 2022Management Practice Violations - Failure to Maintain RecordsST6
May 1, 2022Management Practice Violations - Failure to Maintain RecordsST6
January 1, 2022Management Practice Violations - Failure to Maintain RecordsST6
October 29, 2021Management Practice Violations - Failure to Maintain RecordsST6
October 1, 2021Management Practice Violations - Failure to Maintain RecordsST6
October 1, 2021Monitoring Violations - Improper Analysis or Lab ErrorST6
September 1, 2021Management Practice Violations - Failure to Maintain RecordsST6
July 1, 2021Management Practice Violations - Failure to Maintain RecordsST6
June 21, 2021Reporting Violations - Late Submittal of DMRsST6
May 1, 2021Management Practice Violations - Failure to Maintain RecordsST6

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, MIG580315.

Start the watch

How often?
  • One permit holder — $99/month
  • One watershed — $2,990/year
  • One state — $4,990/year
  • The whole register — $18,000/year

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 MIG580315 there.

Nearby on the register

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

What this page shows

This public-records page covers the NPDES MIG580315 discharge permit held by Tri-Park Holdings for FLAT ROCK MHP-CARLETON in Carleton, MI, a minor discharger whose permit is administratively continued. The page lists 22 pollutants on file with 22 pollutants under a numeric limit and 4 pollutants with an effluent exceedance.