MARTIN MARIETTA MATERIALS SOUTHWEST LLC

NPDES permit TX0139483 · Minor NON-POTW · administratively continued, expires 2025-05-29 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

This permit expired on 2025-05-29 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

EPA's record, 2025-09-01 to 2026-08-31

4values over a limit
0required values missing, on 0 form(s)
0of 24 forms filed late

Last period with anything received: 2026-07-31. Most often over: pH (2), Solids, total suspended (2).

Reporting

Reports are due about 20 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (58)

OutfallParameterStatisticLimitMonths
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedDAILY AV <= 45 mg/L all year
001Arsenic, total [as As]DAILY AV <= .1 mg/L all year
001Arsenic, total [as As]DAILY MX <= .3 mg/L all year
001Barium, total [as Ba]DAILY AV <= 1 mg/L all year
001Barium, total [as Ba]DAILY MX <= 4 mg/L all year
001Cadmium, total [as Cd]DAILY AV <= .05 mg/L all year
001Cadmium, total [as Cd]DAILY MX <= .15 mg/L all year
001Chromium, total [as Cr]DAILY AV <= .5 mg/L all year
001Chromium, total [as Cr]DAILY MX <= 5 mg/L all year
001Copper, total [as Cu]DAILY AV <= .04 mg/L all year
001Copper, total [as Cu]DAILY MX <= .09 mg/L all year
001Lead, total [as Pb]DAILY AV <= .35 mg/L all year
001Lead, total [as Pb]DAILY MX <= .75 mg/L all year
001Manganese, total [as Mn]DAILY AV <= 1 mg/L all year
001Manganese, total [as Mn]DAILY MX <= 3 mg/L all year
001Nickel, total [as Ni]DAILY AV <= 1 mg/L all year
001Nickel, total [as Ni]DAILY MX <= 3 mg/L all year
001Silver, total [as Ag]DAILY AV <= .03 mg/L all year
001Silver, total [as Ag]DAILY MX <= .05 mg/L all year
001Zinc, total [as Zn]DAILY AV <= .31 mg/L all year
001Zinc, total [as Zn]DAILY MX <= .66 mg/L all year
001Selenium, total [as Se]DAILY AV <= .02 mg/L all year
001Selenium, total [as Se]DAILY MX <= .04 mg/L all year
001Flow, in conduit or thru treatment plantDAILY AV report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Mercury, total [as Hg]DAILY AV <= .002 mg/L all year
001Mercury, total [as Hg]DAILY MX <= .004 mg/L all year
002pHMINIMUM >= 6 SU all year
002pHMAXIMUM <= 9 SU all year
002Solids, total suspendedDAILY AV <= 45 mg/L all year
002Arsenic, total [as As]DAILY AV <= .1 mg/L all year
002Arsenic, total [as As]DAILY MX <= .3 mg/L all year
002Barium, total [as Ba]DAILY AV <= 1 mg/L all year
002Barium, total [as Ba]DAILY MX <= 4 mg/L all year
002Cadmium, total [as Cd]DAILY AV <= .05 mg/L all year
002Cadmium, total [as Cd]DAILY MX <= .15 mg/L all year
002Chromium, total [as Cr]DAILY AV <= .5 mg/L all year
002Chromium, total [as Cr]DAILY MX <= 5 mg/L all year
002Copper, total [as Cu]DAILY AV <= .04 mg/L all year
002Copper, total [as Cu]DAILY MX <= .09 mg/L all year
002Lead, total [as Pb]DAILY AV <= .35 mg/L all year
002Lead, total [as Pb]DAILY MX <= .75 mg/L all year
002Manganese, total [as Mn]DAILY AV <= 1 mg/L all year
002Manganese, total [as Mn]DAILY MX <= 3 mg/L all year
002Nickel, total [as Ni]DAILY AV <= 1 mg/L all year
002Nickel, total [as Ni]DAILY MX <= 3 mg/L all year
002Silver, total [as Ag]DAILY AV <= .03 mg/L all year
002Silver, total [as Ag]DAILY MX <= .05 mg/L all year
002Zinc, total [as Zn]DAILY AV <= .31 mg/L all year
002Zinc, total [as Zn]DAILY MX <= .66 mg/L all year
002Selenium, total [as Se]DAILY AV <= .02 mg/L all year
002Selenium, total [as Se]DAILY MX <= .04 mg/L all year
002Flow, in conduit or thru treatment plantDAILY AV report only all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
002Mercury, total [as Hg]DAILY AV <= .002 mg/L all year
002Mercury, total [as Hg]DAILY MX <= .004 mg/L all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states