CITY OF GREAT FALLS

NPDES permit MT0000442 · Minor POTW · effective, expires 2029-05-31 · 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

0values over a limit
0required values missing, on 0 form(s)
0of 30 forms filed late

Last period with anything received: 2026-07-31.

Reporting

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

Limits in force (41)

OutfallParameterStatisticLimitMonths
001Flow rateMO AVG report only all year
001Flow rateDAILY MX report only all year
001pHDAILY MN >= 6 SU all year
001pHDAILY MX <= 9 SU all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedDAILY MX <= 45 mg/L all year
001Solids, total suspendedMO AVG <= 325 lb/d all year
001Solids, total suspendedDAILY MX <= 900 lb/d all year
001Nitrogen, total [as N]MO AVG report only Jul, Aug, Sep, Oct
001Nitrogen, total [as N]MO AVG report only Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG report only all year
001Nitrogen, ammonia total [as N]DAILY MX report only all year
001Nitrogen, Kjeldahl, total [as N]MO AVG report only Jul, Aug, Sep, Oct
001Nitrite + Nitrate total [as N]MO AVG report only Jul, Aug, Sep, Oct
001Aluminum, dissolved [as Al]MO AVG report only all year
001Aluminum, dissolved [as Al]DAILY MX report only all year
001N-Nitrosodimethylamine [NDMA]DAILY MX report only all year
001Chlorine, total residualMO AVG <= .09999 mg/L all year
001Chlorine, total residualDAILY MX <= .16 mg/L all year
001Haloacetic acids [HAA5]DAILY MX report only all year
001Solids, total dissolvedMO AVG report only all year
001Solids, total dissolvedDAILY MX report only all year
001SulfateMO AVG report only all year
001SulfateDAILY MX report only all year
001Duration of dischargeVALUE report only all year
001Oil and grease visualVALUE report only all year
002Flow rateMO AVG report only all year
002Flow rateDAILY MX report only all year
002pHDAILY MN report only all year
002pHDAILY MX report only all year
002Solids, total suspendedMO AVG report only all year
002Solids, total suspendedDAILY MX report only all year
002Solids, total suspendedMO AVG report only all year
002Solids, total suspendedDAILY MX report only all year
002Aluminum, dissolved [as Al]MO AVG report only all year
002Aluminum, dissolved [as Al]DAILY MX report only all year
002N-Nitrosodimethylamine [NDMA]DAILY MX report only all year
002Chlorine, total residualMO AVG report only all year
002Chlorine, total residualDAILY MX report only all year
002Duration of dischargeVALUE report only all year
002Oil and grease visualVALUE 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