CITY OF HELENA

NPDES permit MT0022641 · Major POTW · administratively continued, expires 2017-09-30 · EPA's file as of 2026-09-19

Check this month's numbers before you file

This permit expired on 2017-09-30 and is administratively continued: 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

4values over a limit
0required values missing, on 0 form(s)
0of 22 forms filed late

Last period with anything received: 2026-08-31. Most often over: Zinc, total recoverable (4).

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 (79)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeMO AVG report only all year
001Temperature, water deg. centigradeDAILY MX report only all year
001Flow rateMO AVG report only all year
001Flow rateDAILY MX report only all year
001Flow rateMO AVG report only all year
001Flow rateDAILY MX report only all year
001BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 45 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG <= 1351 lb/d all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 2027 lb/d all year
001BOD, 5-day, 20 deg. CMO AVG report only all year
001BOD, 5-day, 20 deg. CWKLY AVG report only all year
001pHINST MIN >= 6.5 SU all year
001pHINST MAX <= 9 SU all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedWKLY AVG <= 45 mg/L all year
001Solids, total suspendedMO AVG <= 1351 lb/d all year
001Solids, total suspendedWKLY AVG <= 2027 lb/d all year
001Solids, total suspendedMO AVG report only all year
001Solids, total suspendedWKLY AVG report only all year
001Oil and grease, hexane extr methodDAILY MX <= 10 mg/L all year
001Nitrogen, total [as N]ANNL AVG report only all year
001Nitrogen, total [as N]MO AVG report only all year
001Nitrogen, total [as N]WKLY AVG report only all year
001Nitrogen, total [as N]MO AVG <= 241 lb/d all year
001Nitrogen, total [as N]WKLY AVG <= 308 lb/d all year
001Nitrogen, ammonia total [as N]MO AVG <= 1.67 mg/L all year
001Nitrogen, ammonia total [as N]WKLY AVG <= 3.83 mg/L all year
001Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
001Nitrogen, Kjeldahl, total [as N]WKLY AVG report only all year
001Nitrite + Nitrate total [as N]MO AVG report only all year
001Nitrite + Nitrate total [as N]WKLY AVG report only all year
001Phosphorus, total [as P]MO AVG report only all year
001Phosphorus, total [as P]WKLY AVG report only all year
001Phosphorus, total [as P]MO AVG <= 108 lb/d all year
001Phosphorus, total [as P]ANNL AVG report only all year
001Phosphorus, total [as P]WKLY AVG <= 166 lb/d all year
001Cyanide, total [as CN]VALUE report only all year
001Hardness, total [as CaCO3]VALUE report only all year
001Arsenic, total recoverableVALUE report only all year
001Arsenic, total recoverableVALUE report only all year
001Selenium, total recoverableVALUE report only all year
001Selenium, total recoverableVALUE report only all year
001Thallium, total recoverableVALUE report only all year
001Thallium, total recoverableVALUE report only all year
001Beryllium, total recoverable [as Be]VALUE report only all year
001Beryllium, total recoverable [as Be]VALUE report only all year
001Nickel, total recoverableVALUE report only all year
001Nickel, total recoverableVALUE report only all year
001Silver total recoverableVALUE report only all year
001Silver total recoverableVALUE report only all year
001Zinc, total recoverableMO AVG <= .11 mg/L all year
001Zinc, total recoverableDAILY MX <= .11 mg/L all year
001Aluminum, dissolved [as Al]VALUE report only all year
001Aluminum, dissolved [as Al]VALUE report only all year
001Cadmium, total recoverableVALUE report only all year
001Cadmium, total recoverableVALUE report only all year
001Lead, total recoverableVALUE report only all year
001Lead, total recoverableVALUE report only all year
001Chromium, total recoverableVALUE report only all year
001Copper, total recoverableMO AVG <= .009 mg/L all year
001Copper, total recoverableVALUE report only all year
001Copper, total recoverableDAILY MX <= .013 mg/L all year
001Antimony, total recoverableVALUE report only all year
001Antimony, total recoverableVALUE report only all year
001E. coli, MTEC-MFMOAV GEO <= 126 CFU/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
001E. coli, MTEC-MFMOAV GEO <= 630 CFU/100mL Jan, Feb, Mar, Nov, Dec
001E. coli, MTEC-MFWKLY AVG <= 252 CFU/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
001E. coli, MTEC-MFWKLY AVG <= 1260 CFU/100mL Jan, Feb, Mar, Nov, Dec
001PhenolsVALUE report only all year
001Solids, total dissolved [TDS]VALUE report only all year
001Mercury, total recoverableVALUE report only all year
001Mercury, total recoverableVALUE report only all year
001BOD, 5-day, percent removalMINIMUM >= 85 % all year
001Solids, suspended percent removalMINIMUM >= 85 % all year
001Oil and grease visualVALUE report only all year
001Report due [yrmoda]VALUE report only all year
001Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubiaSINGSAMP report only all year
001Pass/Fail Static Renewal 7Day Chronic Pimephales promelasSINGSAMP 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