ASARCO, INC.

NPDES permit AZ0024635 · Minor NON-POTW · expired, expires 2026-03-31 · 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 2026-03-31 and is expired: 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

0values over a limit
153required values missing, on 18 form(s)
0of 20 forms filed late

Last period with anything received: 2025-09-30.

Reporting

Reports are due about 89 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (17)

OutfallParameterStatisticLimitMonths
002DpHMINIMUM >= 6.5 SU all year
002DpHMAXIMUM <= 9 SU all year
002DSolids, total suspendedDAILY MX report only (alert) all year
002DNitrite + Nitrate total [as N]DAILY MX report only all year
002DHardness, total [as CaCO3]DAILY MX report only (alert) all year
002DArsenic, total recoverableDAILY MX <= 420 ug/L (alert) all year
002DSelenium, total recoverableDAILY MX <= 33 ug/L (alert) all year
002DZinc, total recoverableDAILY MX <= 2.491 mg/L all year
002DCadmium, total recoverableDAILY MX <= 181 ug/L (alert) all year
002DLead, total recoverableDAILY MX <= .015 mg/L all year
002DChromium, total recoverableDAILY MX <= 100 ug/L (alert) all year
002DCopper, total recoverableDAILY MX <= .057 mg/L all year
002DChromium, hexavalent dissolved [as Cr]DAILY MX <= 34 ug/L (alert) all year
002DFlow, in conduit or thru treatment plantDAILY MX report only all year
002DFlow, in conduit or thru treatment plantDAILY MX report only all year
002DMercury, total recoverableDAILY MX <= 2 ug/L (alert) all year
002DChemical Oxygen Demand [COD]DAILY MX report only (alert) 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