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Clean Water Act discharge permit · NPDES MNG490081

MATHY CONSTRUCTION - AGGREGATE, Rochester, MN: NPDES MNG490081 discharge permit, effluent exceedances, inspections, penalties

MATHY CONSTRUCTION - AGGREGATE, held by Mathy Construction Company, holds NPDES permit MNG490081. EPA’s file records it issued January 1, 2024 and expiring May 31, 2027.

MATHY CONSTRUCTION - AGGREGATE, Rochester, Minnesota: Coverage under a general permit MNG490081, held by Mathy Construction Company; Effective; issued January 1, 2024, term to May 31, 2027, by STA.

  • Solids, total suspended: 7 limits, 2 violations of any kind, 2 effluent exceedances, latest September 30, 2022, largest 70% over the limit.
  • pH: 14 limits, 0 violations of any kind, 0 effluent exceedances.
  • Flow, in conduit or thru treatment plant: 14 limits, 0 violations of any kind, 0 effluent exceedances.
  • Phosphorus, total [as P]: 7 limits, 0 violations of any kind, 0 effluent exceedances.

MATHY CONSTRUCTION - AGGREGATE among its neighbors

EPA’s permit file holds 4 discharge permits in the County Ditch No 5-Straight River subwatershed (HUC 070400020305), MNG490081 among them. Its county holds 21, 2 of them major permits; MNG490081 is a minor permit.

Other permits in the County Ditch No 5-Straight River subwatershed (HUC 070400020305)

  • HOPE - SOMERSET TOWNSHIP WWTP, Hope: MN0068802, minor permit, discharging to STRAIGHT R, permit term to October 31, 2018
  • HOPE CREAMERY, Somerset Township: MN0001317, minor permit, discharging to STRAIGHT R VIA SS, permit term to September 30, 2019
  • MNDOT STRAIGHT RIVER REST AREA, Owatonna: MN0049514, minor permit, discharging to STRAIGHT R, permit term to April 30, 2019

Identity

Facility as filedMATHY CONSTRUCTION - AGGREGATE
Permittee as filedMathy Construction Company
NPDES IDMNG490081
Permit statusEffective
Permit typeCoverage under a general permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
IssuedJanuary 1, 2024
Expiration dateMay 31, 2027
Issuing agencySTA
AddressRochester, MN 55906
SubwatershedCounty Ditch No 5-Straight River (HUC 070400020305)
SIC1422 – Crushed And Broken Limestone

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
Solids, total suspended722September 30, 202270% over the limit
pH1400
Flow, in conduit or thru treatment plant1400
Phosphorus, total [as P]700

Inspections, violations and enforcement

EPA’s single-event violation file, as loaded, holds no violation for NPDES MNG490081.

Inspections

EPA’s inspection file holds no inspection for NPDES MNG490081.

Formal enforcement and penalties

0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.

Informal enforcement

EPA’s informal enforcement file holds no action for NPDES MNG490081.

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Nearby on the register

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

What this page shows

This public-records page covers NPDES permit MNG490081 for MATHY CONSTRUCTION - AGGREGATE in Rochester, MN, held by Mathy Construction Company, with a status of Effective and a Minor discharger class, issued January 1, 2024 and expiring May 31, 2027. The page lists 4 pollutants on file, of which 4 are under a numeric limit, 1 has a violation of any kind, and 1 has an effluent exceedance.