Montana DEQ

NPDES permit MT0032247 · Minor NON-POTW · effective, expires 2030-11-20 · 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

32values over a limit
2required values missing, on 1 form(s)
2of 8 forms filed late

Last period with anything received: 2026-07-31. Most often over: Iron, total [as Fe] (14), Aluminum, dissolved [as Al] (8), Zinc, total recoverable (7).

Reporting

Reports are due about 28 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (24)

OutfallParameterStatisticLimitMonths
001Flow rateMO AVG report only all year
001Flow rateDAILY MX report only all year
001ConductivityMO AVG report only all year
001ConductivityDAILY MX report only all year
001pHDAILY MN >= 6 SU all year
001pHDAILY MX <= 9 SU all year
001Solids, total suspendedMO AVG <= 35 mg/L all year
001Solids, total suspendedDAILY MX <= 70 mg/L all year
001Arsenic, total recoverableMO AVG report only all year
001Arsenic, total recoverableDAILY MX report only all year
001Iron, total [as Fe]MO AVG <= 3.5 mg/L all year
001Iron, total [as Fe]DAILY MX <= 7 mg/L all year
001Manganese, total [as Mn]MO AVG <= 2 mg/L all year
001Manganese, total [as Mn]DAILY MX <= 4 mg/L all year
001Zinc, total recoverableMO AVG <= 146 ug/L all year
001Zinc, total recoverableDAILY MX <= 292 ug/L all year
001Aluminum, dissolved [as Al]MO AVG <= 71 ug/L all year
001Aluminum, dissolved [as Al]DAILY MX <= 143 ug/L all year
001Cadmium, total recoverableMO AVG <= 1.6 ug/L all year
001Cadmium, total recoverableDAILY MX <= 3.1 ug/L all year
001Lead, total recoverableMO AVG <= 12 ug/L all year
001Lead, total recoverableDAILY MX <= 15 ug/L all year
001Copper, total recoverableMO AVG <= 19 ug/L all year
001Copper, total recoverableDAILY MX <= 37 ug/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