CITY OF EAST HELENA

NPDES permit MT0022560 · Minor POTW · administratively continued, expires 2024-11-30 · EPA's file as of 2026-09-19

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This permit expired on 2024-11-30 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

22values over a limit
0required values missing, on 0 form(s)
0of 19 forms filed late

Last period with anything received: 2026-07-31. Most often over: BOD, 5-day, 20 deg. C (7), Nitrogen, total [as N] (6), Phosphorus, total [as P] (4).

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 (47)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeVALUE 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 MAX <= 45 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG <= 109 lb/d all year
001BOD, 5-day, 20 deg. CWKLY MAX <= 163 lb/d all year
001BOD, 5-day, 20 deg. CMO AVG report only all year
001BOD, 5-day, 20 deg. CWKLY MAX report only all year
001pHINST MIN >= 6 SU all year
001pHINST MAX <= 9 SU all year
001pHQC report only all year
001pHQB report only all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedWKLY MAX <= 45 mg/L all year
001Solids, total suspendedMO AVG <= 109 lb/d all year
001Solids, total suspendedWKLY MAX <= 163 lb/d all year
001Solids, total suspendedMO AVG report only all year
001Solids, total suspendedWKLY MAX report only all year
001Oil & GreaseSINGGRAB report only all year
001Nitrogen, total [as N]MO AVG report only all year
001Nitrogen, total [as N]MO AVG <= 53.3 lb/d all year
001Nitrogen, ammonia total [as N]VALUE report only all year
001Nitrogen, ammonia total [as N]SINGGRAB report only all year
001Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
001Nitrite + Nitrate total [as N]MO AVG report only all year
001Phosphorus, total [as P]MO AVG report only Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
001Phosphorus, total [as P]MO AVG report only Jul, Aug, Sep
001Phosphorus, total [as P]MO AVG <= 11.2 lb/d Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
001Phosphorus, total [as P]MO AVG <= 5.5 lb/d Jul, Aug, Sep
001Hardness, total [as CaCO3]SINGGRAB report only all year
001Arsenic, total recoverableMO AVG report only all year
001Arsenic, total recoverableDAILY MX report only all year
001Arsenic, total recoverableSINGGRAB report only all year
001Zinc, total recoverableSINGSAMP report only all year
001Zinc, total recoverableSINGGRAB report only all year
001Lead, total recoverableSINGSAMP report only all year
001Lead, total recoverableSINGGRAB report only all year
001Copper, total recoverableMO AVG <= 11.7 ug/L all year
001Copper, total recoverableDAILY MX <= 17.5 ug/L all year
001Copper, total recoverableSINGGRAB report only all year
001E. coli, MTEC-MFMOAV GEO <= 630 #/100mL (alert) Jan, Feb, Mar, Nov, Dec
001E. coli, MTEC-MFMOAV GEO <= 126 #/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
001E. coli, MTEC-MFMX 7D GM <= 1260 #/100mL (alert) Jan, Feb, Mar, Nov, Dec
001E. coli, MTEC-MFMX 7D GM <= 252 #/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % 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