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Clean Water Act discharge permit · NPDES TXR05GC25

MM - SAN LEON RECYCLE YARD, San Leon, TX: NPDES TXR05GC25 discharge permit, effluent exceedances, inspections, penalties

MM - SAN LEON RECYCLE YARD, held by Martin Marietta Materials Southwest, LLC, holds NPDES permit TXR05GC25. EPA’s file records it issued May 19, 2023 and expiring August 13, 2026.

MM - SAN LEON RECYCLE YARD, San Leon, Texas: Coverage under a general permit TXR05GC25, held by Martin Marietta Materials Southwest, LLC; Industrial stormwater; Administratively continued (past its expiration date and still in force until reissued); issued May 19, 2023, term to August 13, 2026.

  • Copper, total [as Cu]: 4 limits, 0 violations of any kind, 0 effluent exceedances.
  • Lead, total [as Pb]: 4 limits, 0 violations of any kind, 0 effluent exceedances.
  • Zinc, total [as Zn]: 4 limits, 0 violations of any kind, 0 effluent exceedances.
  • Solids, total suspended: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • Arsenic, total [as As]: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • Barium, total [as Ba]: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • Cadmium, total [as Cd]: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • Chromium, total [as Cr]: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • Manganese, total [as Mn]: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • Nickel, total [as Ni]: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • Silver, total [as Ag]: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • Selenium, total [as Se]: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • Mercury, total [as Hg]: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • Chemical Oxygen Demand [COD]: 2 limits, 0 violations of any kind, 0 effluent exceedances.

Texas holds 8,480 Industrial stormwater coverages of this permit type in EPA’s file; 4,512 were issued before TXR05GC25. Martin Marietta Materials Southwest, LLC holds 43 permits in Texas.

Other permits held by Martin Marietta Materials Southwest, LLC

Coverages issued nearest TXR05GC25

MM - SAN LEON RECYCLE YARD among its neighbors

EPA’s permit file holds 382 discharge permits in the Dickinson Bayou subwatershed (HUC 120402040200), TXR05GC25 among them.

Other permits in the Dickinson Bayou subwatershed (HUC 120402040200)

What the register holds for MM - SAN LEON RECYCLE YARD: its NPDES ID, its permit type and status, its dates, its address in San Leon, Texas, and 14 pollutants under a numeric limit. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES TXR05GC25.

Identity

Facility as filedMM - SAN LEON RECYCLE YARD
Permittee as filedMartin Marietta Materials Southwest, LLC
NPDES IDTXR05GC25
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
ProgramIndustrial stormwater
IssuedMay 19, 2023
Expiration dateAugust 13, 2026
AddressSan Leon, TX 77539
SubwatershedDickinson Bayou (HUC 120402040200)

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
Copper, total [as Cu]400
Lead, total [as Pb]400
Zinc, total [as Zn]400
Solids, total suspended200
Arsenic, total [as As]200
Barium, total [as Ba]200
Cadmium, total [as Cd]200
Chromium, total [as Cr]200
Manganese, total [as Mn]200
Nickel, total [as Ni]200
Silver, total [as Ag]200
Selenium, total [as Se]200
Mercury, total [as Hg]200
Chemical Oxygen Demand [COD]200

EPA’s effluent violation file records no exceedance of a numeric limit for NPDES TXR05GC25.

Inspections, violations and enforcement

EPA’s single-event violation file, as loaded, holds no violation for NPDES TXR05GC25.

Inspections

EPA’s inspection file holds no inspection for NPDES TXR05GC25.

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 TXR05GC25.

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Nearby on the register

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

What this page shows

This public-records page covers NPDES permit TXR05GC25, held by Martin Marietta Materials Southwest, LLC for MM - SAN LEON RECYCLE YARD in San Leon, Texas, under an industrial stormwater program. The permit is listed as administratively continued, with 14 pollutants under a numeric limit and 0 pollutants with an effluent exceedance.