Martin Marietta Materials Southwest LLC — NPDES permit TX0139483: limits, due date and EPA's record

Construction Sand And Gravel, Weatherford, Texas. NPDES permit TX0139483 expired May 29, 2025; its limits still apply. Last 12 months: over a limit 4 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period ending	Parameter	Reported	Limit	Over by
November 2025	pH, maximum	9.22 SU	≤ 9 SU	—
February 2026	pH, maximum	9.12 SU	≤ 9 SU	—
May 2026	Solids, total suspended, daily average	70 mg/L	≤ 45 mg/L	56%
June 2026	Solids, total suspended, daily average	167.4 mg/L	≤ 45 mg/L	272%

Limits in force (58)

Parameter	Statistic	Limit	Months	Outfall
pH	minimum	≥ 6 SU	all year	001
pH	maximum	≤ 9 SU	all year	001
Solids, total suspended	daily average	≤ 45 mg/L	all year	001
Arsenic, total [as As]	daily average	≤ .1 mg/L	all year	001
Arsenic, total [as As]	daily maximum	≤ .3 mg/L	all year	001
Barium, total [as Ba]	daily average	≤ 1 mg/L	all year	001
Barium, total [as Ba]	daily maximum	≤ 4 mg/L	all year	001
Cadmium, total [as Cd]	daily average	≤ .05 mg/L	all year	001
Cadmium, total [as Cd]	daily maximum	≤ .15 mg/L	all year	001
Chromium, total [as Cr]	daily average	≤ .5 mg/L	all year	001
Chromium, total [as Cr]	daily maximum	≤ 5 mg/L	all year	001
Copper, total [as Cu]	daily average	≤ .04 mg/L	all year	001
Copper, total [as Cu]	daily maximum	≤ .09 mg/L	all year	001
Lead, total [as Pb]	daily average	≤ .35 mg/L	all year	001
Lead, total [as Pb]	daily maximum	≤ .75 mg/L	all year	001
Manganese, total [as Mn]	daily average	≤ 1 mg/L	all year	001
Manganese, total [as Mn]	daily maximum	≤ 3 mg/L	all year	001
Nickel, total [as Ni]	daily average	≤ 1 mg/L	all year	001
Nickel, total [as Ni]	daily maximum	≤ 3 mg/L	all year	001
Silver, total [as Ag]	daily average	≤ .03 mg/L	all year	001
Silver, total [as Ag]	daily maximum	≤ .05 mg/L	all year	001
Zinc, total [as Zn]	daily average	≤ .31 mg/L	all year	001
Zinc, total [as Zn]	daily maximum	≤ .66 mg/L	all year	001
Selenium, total [as Se]	daily average	≤ .02 mg/L	all year	001
Selenium, total [as Se]	daily maximum	≤ .04 mg/L	all year	001
Flow, in conduit or thru treatment plant	daily average	report only (MGD)	all year	001
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	001
Mercury, total [as Hg]	daily average	≤ .002 mg/L	all year	001
Mercury, total [as Hg]	daily maximum	≤ .004 mg/L	all year	001
pH	minimum	≥ 6 SU	all year	002
pH	maximum	≤ 9 SU	all year	002
Solids, total suspended	daily average	≤ 45 mg/L	all year	002
Arsenic, total [as As]	daily average	≤ .1 mg/L	all year	002
Arsenic, total [as As]	daily maximum	≤ .3 mg/L	all year	002
Barium, total [as Ba]	daily average	≤ 1 mg/L	all year	002
Barium, total [as Ba]	daily maximum	≤ 4 mg/L	all year	002
Cadmium, total [as Cd]	daily average	≤ .05 mg/L	all year	002
Cadmium, total [as Cd]	daily maximum	≤ .15 mg/L	all year	002
Chromium, total [as Cr]	daily average	≤ .5 mg/L	all year	002
Chromium, total [as Cr]	daily maximum	≤ 5 mg/L	all year	002
Copper, total [as Cu]	daily average	≤ .04 mg/L	all year	002
Copper, total [as Cu]	daily maximum	≤ .09 mg/L	all year	002
Lead, total [as Pb]	daily average	≤ .35 mg/L	all year	002
Lead, total [as Pb]	daily maximum	≤ .75 mg/L	all year	002
Manganese, total [as Mn]	daily average	≤ 1 mg/L	all year	002
Manganese, total [as Mn]	daily maximum	≤ 3 mg/L	all year	002
Nickel, total [as Ni]	daily average	≤ 1 mg/L	all year	002
Nickel, total [as Ni]	daily maximum	≤ 3 mg/L	all year	002
Silver, total [as Ag]	daily average	≤ .03 mg/L	all year	002
Silver, total [as Ag]	daily maximum	≤ .05 mg/L	all year	002
Zinc, total [as Zn]	daily average	≤ .31 mg/L	all year	002
Zinc, total [as Zn]	daily maximum	≤ .66 mg/L	all year	002
Selenium, total [as Se]	daily average	≤ .02 mg/L	all year	002
Selenium, total [as Se]	daily maximum	≤ .04 mg/L	all year	002
Flow, in conduit or thru treatment plant	daily average	report only (MGD)	all year	002
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	002
Mercury, total [as Hg]	daily average	≤ .002 mg/L	all year	002
Mercury, total [as Hg]	daily maximum	≤ .004 mg/L	all year	002

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/TX0139483 · MCP: https://passage-data.com/mcp