Stephen Ball - Coeur Alaska, Inc.

NPDES permit AK0050571 · Major NON-POTW · effective, expires 2029-07-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file

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

1values over a limit
0required values missing, on 0 form(s)
3of 33 forms filed late

Last period with anything received: 2026-07-31. Most often over: Nitrogen, ammonia total [as N] (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 (62)

OutfallParameterStatisticLimitMonths
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedMO AVG <= 20 mg/L all year
001Solids, total suspendedDAILY MX <= 30 mg/L all year
001Nitrogen, ammonia total [as N]MO AVG <= 3.2 mg/L all year
001Nitrogen, ammonia total [as N]DAILY MX <= 5.8 mg/L all year
001Nitrogen, nitrate total [as N]MO AVG <= 10 mg/L all year
001Nitrogen, nitrate total [as N]DAILY MX <= 14 mg/L all year
001Iron, total recoverableMO AVG <= .73 mg/L all year
001Iron, total recoverableDAILY MX <= 1.8 mg/L all year
001Zinc, total recoverableMO AVG <= 54 ug/L all year
001Zinc, total recoverableDAILY MX <= 88 ug/L all year
001Aluminum, total recoverableMO AVG report only all year
001Aluminum, total recoverableDAILY MX report only all year
001Cadmium, total recoverableMO AVG <= .2 ug/L all year
001Cadmium, total recoverableDAILY MX <= .24 ug/L all year
001Lead, total recoverableMO AVG <= 1.9 ug/L all year
001Lead, total recoverableDAILY MX <= 2.5 ug/L all year
001Copper, total recoverableMO AVG <= 3.9 ug/L all year
001Copper, total recoverableDAILY MX <= 9.9 ug/L all year
001Flow, in conduit or thru treatment plantMO AVG <= 4500 gal/min all year
001Flow, in conduit or thru treatment plantDAILY MX <= 4500 gal/min all year
001Toxicity, final conc toxicity unitsMO AVG <= 1.1 tox chronic all year
001Toxicity, final conc toxicity unitsDAILY MX <= 1.6 tox chronic all year
001Solids, total dissolvedMO AVG report only all year
001Solids, total dissolvedDAILY MX report only all year
001Mercury, total [as Hg]MO AVG <= .01 ug/L all year
001Mercury, total [as Hg]DAILY MX <= .02 ug/L all year
001SulfateDAILY MX report only all year
001SulfateMO AVG report only all year
002pHMINIMUM >= 6 SU all year
002pHMAXIMUM <= 9 SU all year
002Solids, total suspendedMO AVG <= 20 mg/L all year
002Solids, total suspendedDAILY MX <= 30 mg/L all year
002Nitrogen, nitrate total [as N]MO AVG report only all year
002Nitrogen, nitrate total [as N]DAILY MX <= 14 mg/L all year
002Iron, total recoverableMO AVG report only all year
002Iron, total recoverableDAILY MX report only all year
002Zinc, total recoverableMO AVG <= 63 ug/L all year
002Zinc, total recoverableDAILY MX <= 93 ug/L all year
002Cadmium, total recoverableMO AVG <= .19 ug/L all year
002Cadmium, total recoverableDAILY MX <= .3 ug/L all year
002Lead, total recoverableMO AVG <= 2 ug/L all year
002Lead, total recoverableDAILY MX <= 2.8 ug/L all year
002Copper, total recoverableMO AVG <= 5.8 ug/L all year
002Copper, total recoverableDAILY MX <= 11 ug/L all year
002Flow, in conduit or thru treatment plantMO AVG <= 2000 gal/min all year
002Flow, in conduit or thru treatment plantDAILY MX <= 2000 gal/min all year
002Nitrogen, Ammonia TotalMO AVG report only all year
002Nitrogen, Ammonia TotalDAILY MX <= 4.6 mg/L all year
002Toxicity, final conc toxicity unitsMO AVG <= 1.1 tox chronic all year
002Toxicity, final conc toxicity unitsDAILY MX <= 1.6 tox chronic all year
002Solids, total dissolvedMO AVG <= 500 mg/L all year
002Solids, total dissolvedDAILY MX <= 587 mg/L all year
002Mercury, total recoverableMO AVG <= .01 ug/L all year
002Mercury, total recoverableDAILY MX <= .02 ug/L all year
002SulfateMO AVG report only all year
002SulfateDAILY MX report only all year
003Flow, in conduit or thru treatment plantMO AVG <= 4000 gal/min all year
003Flow, in conduit or thru treatment plantDAILY MX <= 4000 gal/min all year
003SulfateMO AVG <= 250 mg/L all year
003SulfateDAILY MX <= 500 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