Martin Marietta Materials, Inc.

NPDES permit MO0139173 · Minor NON-POTW · administratively continued, expires 2024-04-30 · EPA's file as of 2026-09-19

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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 2024-04-30 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 12 forms filed late

Last period with anything received: 2026-08-31. Most often over: Chloride (2), Sulfate [as S] (2).

Reporting

Reports are due about 28 days after each monitoring period ends (the most common figure among MO permits in EPA's filings — check your permit).

Limits in force (14)

OutfallParameterStatisticLimitMonths
005Sulfate [as S]DAILY MX <= 1400 mg/L all year
005Sulfate [as S]MO AVG <= 1100 mg/L all year
005pHMINIMUM >= 6 SU all year
005pHMAXIMUM <= 9 SU all year
005Solids, total suspendedDAILY MX <= 70 mg/L all year
005Solids, total suspendedMO AVG <= 70 mg/L all year
005Oil and grease [soxhlet extr.] tot.DAILY MX <= 15 mg/L all year
005Oil and grease [soxhlet extr.] tot.MO AVG <= 10 mg/L all year
005ChlorideDAILY MX <= 17000 mg/L all year
005ChlorideMO AVG <= 13000 mg/L all year
005Flow, in conduit or thru treatment plantDAILY MX report only all year
005Flow, in conduit or thru treatment plantMO AVG report only all year
005Chlorides + SulfatesDAILY MX report only all year
005Chlorides + SulfatesMO AVG report only 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