Howmet Aerospace Inc.

NPDES permit OH0112356 · Minor NON-POTW · effective, expires 2031-05-31 · 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.

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

1values over a limit
0required values missing, on 0 form(s)
0of 55 forms filed late

Last period with anything received: 2026-07-31. Most often over: Oil and grease, hexane extr method (1).

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 (77)

OutfallParameterStatisticLimitMonths
001pHDAILY MN report only all year
001pHDAILY MX report only all year
001Solids, total suspendedMO AVG report only all year
001Solids, total suspendedDAILY MX report only all year
001Oil and grease, hexane extr methodMO AVG report only all year
001Oil and grease, hexane extr methodDAILY MX report only all year
001Nitrite + Nitrate total [as N]MO AVG report only all year
001Nitrite + Nitrate total [as N]DAILY MX report only all year
001Zinc, total recoverableMO AVG report only all year
001Zinc, total recoverableDAILY MX report only all year
001Aluminum, total recoverableMO AVG report only all year
001Aluminum, total recoverableDAILY MX report only all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
004pHDAILY MN >= 6.5 SU all year
004pHDAILY MX <= 9 SU all year
004Solids, total suspendedMO AVG report only all year
004Solids, total suspendedDAILY MX report only all year
004Oil and grease, hexane extr methodDAILY MX <= 10 mg/L all year
004Nitrite + Nitrate total [as N]MO AVG report only all year
004Nitrite + Nitrate total [as N]DAILY MX report only all year
004Zinc, total recoverableMO AVG report only all year
004Zinc, total recoverableDAILY MX report only all year
004Aluminum, total recoverableMO AVG report only all year
004Aluminum, total recoverableDAILY MX report only all year
004Flow, in conduit or thru treatment plantMO AVG report only all year
004Flow, in conduit or thru treatment plantDAILY MX report only all year
005pHDAILY MN report only all year
005pHDAILY MX report only all year
005Solids, total suspendedMO AVG report only all year
005Solids, total suspendedDAILY MX report only all year
005Oil and grease, hexane extr methodMO AVG report only all year
005Oil and grease, hexane extr methodDAILY MX report only all year
005Nitrite + Nitrate total [as N]MO AVG report only all year
005Nitrite + Nitrate total [as N]DAILY MX report only all year
005Zinc, total recoverableMO AVG report only all year
005Zinc, total recoverableDAILY MX report only all year
005Aluminum, total recoverableMO AVG report only all year
005Aluminum, total recoverableDAILY MX report only all year
005Flow, in conduit or thru treatment plantMO AVG report only all year
005Flow, in conduit or thru treatment plantDAILY MX report only all year
006pHDAILY MN report only Feb, Apr, Jun, Aug, Oct, Dec
006pHDAILY MX report only Feb, Apr, Jun, Aug, Oct, Dec
006Solids, total suspendedMO AVG report only Feb, Apr, Jun, Aug, Oct, Dec
006Solids, total suspendedDAILY MX report only Feb, Apr, Jun, Aug, Oct, Dec
006Oil and grease, hexane extr methodMO AVG report only Feb, Apr, Jun, Aug, Oct, Dec
006Oil and grease, hexane extr methodDAILY MX report only Feb, Apr, Jun, Aug, Oct, Dec
006Nitrite + Nitrate total [as N]MO AVG report only Feb, Apr, Jun, Aug, Oct, Dec
006Nitrite + Nitrate total [as N]DAILY MX report only Feb, Apr, Jun, Aug, Oct, Dec
006Zinc, total recoverableMO AVG report only Feb, Apr, Jun, Aug, Oct, Dec
006Zinc, total recoverableDAILY MX report only Feb, Apr, Jun, Aug, Oct, Dec
006Aluminum, total recoverableMO AVG report only Feb, Apr, Jun, Aug, Oct, Dec
006Aluminum, total recoverableDAILY MX report only Feb, Apr, Jun, Aug, Oct, Dec
006Flow, in conduit or thru treatment plantMO AVG report only Feb, Apr, Jun, Aug, Oct, Dec
006Flow, in conduit or thru treatment plantDAILY MX report only Feb, Apr, Jun, Aug, Oct, Dec
009Specific conductanceMO AVG report only all year
009Specific conductanceDAILY MX report only all year
009pHDAILY MN report only all year
009pHDAILY MX report only all year
009Solids, total suspendedMO AVG report only all year
009Solids, total suspendedDAILY MX report only all year
009Flow, in conduit or thru treatment plantMO AVG report only all year
009Flow, in conduit or thru treatment plantDAILY MX report only all year
010pHDAILY MN report only Jan, Mar, May, Jul, Sep, Nov
010pHDAILY MX report only Jan, Mar, May, Jul, Sep, Nov
010Solids, total suspendedMO AVG report only Jan, Mar, May, Jul, Sep, Nov
010Solids, total suspendedDAILY MX report only Jan, Mar, May, Jul, Sep, Nov
010Oil and grease, hexane extr methodMO AVG report only Jan, Mar, May, Jul, Sep, Nov
010Oil and grease, hexane extr methodDAILY MX report only Jan, Mar, May, Jul, Sep, Nov
010Nitrite + Nitrate total [as N]MO AVG report only Jan, Mar, May, Jul, Sep, Nov
010Nitrite + Nitrate total [as N]DAILY MX report only Jan, Mar, May, Jul, Sep, Nov
010Zinc, total recoverableMO AVG report only Jan, Mar, May, Jul, Sep, Nov
010Zinc, total recoverableDAILY MX report only Jan, Mar, May, Jul, Sep, Nov
010Aluminum, total recoverableMO AVG report only Jan, Mar, May, Jul, Sep, Nov
010Aluminum, total recoverableDAILY MX report only Jan, Mar, May, Jul, Sep, Nov
010Flow, in conduit or thru treatment plantMO AVG report only Jan, Mar, May, Jul, Sep, Nov
010Flow, in conduit or thru treatment plantDAILY MX report only Jan, Mar, May, Jul, Sep, Nov

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