Clean Water Act discharge permit · NPDES TXR05GP22

MM - MERKEL SAND AND GRAVEL, Merkel, TX: NPDES TXR05GP22 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
15Pollutants under a numeric limit
0Pollutants with an effluent exceedance

MM - MERKEL SAND AND GRAVEL, held by Martin Marietta Materials Southwest, LLC, holds NPDES permit TXR05GP22. EPA’s file records it issued December 19, 2024 and expiring August 13, 2026. 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.

What the register holds for MM - MERKEL SAND AND GRAVEL: its NPDES ID, its permit type and status, its dates, its address in Merkel, Texas, and 15 pollutants under a numeric limit. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES TXR05GP22.

Identity

Facility as filed	MM - MERKEL SAND AND GRAVEL
Permittee as filed	Martin Marietta Materials Southwest, LLC
NPDES ID	TXR05GP22
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	Not a publicly owned treatment works
Program	Industrial stormwater
Issued	December 19, 2024
Expiration date	August 13, 2026
Address	Merkel, TX 79563
Subwatershed	Outlet Bitter Creek (HUC 120601020605)
SIC	1442 – Construction Sand And Gravel

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

15Pollutants on file
15Under a numeric limit
0With a violation of any kind
0With 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
Solids, total suspended	2	0	0
Nitrite + Nitrate total [as N]	2	0	0
Arsenic, total [as As]	2	0	0
Barium, total [as Ba]	2	0	0
Cadmium, total [as Cd]	2	0	0
Chromium, total [as Cr]	2	0	0
Copper, total [as Cu]	2	0	0
Lead, total [as Pb]	2	0	0
Manganese, total [as Mn]	2	0	0
Nickel, total [as Ni]	2	0	0
Silver, total [as Ag]	2	0	0
Zinc, total [as Zn]	2	0	0
Selenium, total [as Se]	2	0	0
E. coli	2	0	0
Mercury, total [as Hg]	2	0	0

EPA’s effluent violation file records no exceedance of a numeric limit for NPDES TXR05GP22.

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 TXR05GP22.

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, TXR05GP22.

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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 TXR05GP22 there.

Nearby on the register

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

This public-records page covers the Clean Water Act discharge permit NPDES TXR05GP22 for MM - MERKEL SAND AND GRAVEL in Merkel, TX, held by Martin Marietta Materials Southwest, LLC, under the industrial stormwater program. The page lists a minor discharger class of 15, with 0 pollutants under a numeric limit and 0 pollutants with an effluent exceedance, and the permit is administratively continued.