Passage Data · Check a report · Use it from your AI

City of East Helena

Sewage treatment plant, East Helena, Montana. NPDES permit MT0022560 expired Nov 30, 2024; its limits still apply. Last 12 months: over a limit 43 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (31 values), form Q quarterly (3 values), form UP quarterly (9 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
20 values over a limit, 0 required values missing, 0 of 20 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

All 43 values over a limit
Period endingParameterReportedLimitOver by
October 2025E. coli, MTEC-MF, maximum 7-day geometric mean1620.59 #/100mL≤ 252 #/100mL543%
January 2026Nitrogen, total [as N], monthly average68.95 lb/d≤ 53.3 lb/d29%
January 2026Phosphorus, total [as P], monthly average11.47 lb/d≤ 11.2 lb/d2%
February 2026Copper, total recoverable, daily maximum19 ug/L≤ 17.5 ug/L9%
February 2026Copper, total recoverable, monthly average19 ug/L≤ 11.7 ug/L62%
February 2026Nitrogen, total [as N], monthly average67.49 lb/d≤ 53.3 lb/d27%
March 2026Copper, total recoverable, monthly average17 ug/L≤ 11.7 ug/L45%
March 2026Nitrogen, total [as N], monthly average70.95 lb/d≤ 53.3 lb/d33%
April 2026BOD, 5-day, 20 deg. C, monthly average50.93 mg/L≤ 30 mg/L70%
April 2026BOD, 5-day, 20 deg. C, weekly maximum66.33 mg/L≤ 45 mg/L47%
April 2026Copper, total recoverable, monthly average16 ug/L≤ 11.7 ug/L37%
April 2026Nitrogen, total [as N], monthly average70.78 lb/d≤ 53.3 lb/d33%
May 2026BOD, 5-day, 20 deg. C, monthly average36.92 mg/L≤ 30 mg/L23%
June 2026BOD, 5-day, 20 deg. C, monthly average46.8 mg/L≤ 30 mg/L56%
June 2026BOD, 5-day, 20 deg. C, weekly maximum72.67 mg/L≤ 45 mg/L61%
June 2026Nitrogen, total [as N], monthly average77.53 lb/d≤ 53.3 lb/d45%
June 2026Phosphorus, total [as P], monthly average14.21 lb/d≤ 11.2 lb/d27%
July 2026BOD, 5-day, 20 deg. C, monthly average44.75 mg/L≤ 30 mg/L49%
July 2026BOD, 5-day, 20 deg. C, weekly maximum62.67 mg/L≤ 45 mg/L39%
July 2026Nitrogen, total [as N], monthly average65.69 lb/d≤ 53.3 lb/d23%
July 2026Phosphorus, total [as P], monthly average8.48 lb/d≤ 5.5 lb/d54%
August 2026BOD, 5-day, 20 deg. C, monthly average39.67 mg/L≤ 30 mg/L32%
August 2026BOD, 5-day, 20 deg. C, weekly maximum45.33 mg/L≤ 45 mg/L1%
August 2026E. coli, MTEC-MF, monthly geometric mean515.69 #/100mL≤ 126 #/100mL309%
August 2026E. coli, MTEC-MF, maximum 7-day geometric mean3501.04 #/100mL≤ 252 #/100mL1289%
August 2026Nitrogen, total [as N], monthly average70.53 lb/d≤ 53.3 lb/d32%
August 2026Phosphorus, total [as P], monthly average10.86 lb/d≤ 5.5 lb/d97%
September 2026BOD, 5-day, 20 deg. C, monthly average223.35 lb/d≤ 109 lb/d105%
September 2026BOD, 5-day, 20 deg. C, monthly average95.6 mg/L≤ 30 mg/L219%
September 2026BOD, 5-day, 20 deg. C, weekly maximum150 mg/L≤ 45 mg/L233%
September 2026BOD, 5-day, 20 deg. C, weekly maximum389.22 lb/d≤ 163 lb/d139%
September 2026BOD, 5-day, percent removal, monthly average minimum69.8 %≥ 85 %101%
September 2026Copper, total recoverable, daily maximum30 ug/L≤ 17.5 ug/L71%
September 2026Copper, total recoverable, monthly average30 ug/L≤ 11.7 ug/L156%
September 2026E. coli, MTEC-MF, monthly geometric mean43412.64 #/100mL≤ 126 #/100mL34354%
September 2026E. coli, MTEC-MF, maximum 7-day geometric mean668119.2 #/100mL≤ 252 #/100mL—
September 2026Nitrogen, total [as N], monthly average69.12 lb/d≤ 53.3 lb/d30%
September 2026Phosphorus, total [as P], monthly average11.48 lb/d≤ 5.5 lb/d109%
September 2026Solids, suspended percent removal, monthly average minimum64.03 %≥ 85 %140%
September 2026Solids, total suspended, monthly average229.66 lb/d≤ 109 lb/d111%
September 2026Solids, total suspended, monthly average92.87 mg/L≤ 30 mg/L210%
September 2026Solids, total suspended, weekly maximum237 mg/L≤ 45 mg/L427%
September 2026Solids, total suspended, weekly maximum637.35 lb/d≤ 163 lb/d291%

Limits in force (47)

ParameterStatisticLimitMonths
Temperature, water deg. centigradevaluereport only (deg C)all year
Flow ratemonthly averagereport only (MGD)all year
Flow ratedaily maximumreport only (MGD)all year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cweekly maximum≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 109 lb/dall year
BOD, 5-day, 20 deg. Cweekly maximum≤ 163 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cweekly maximumreport only (mg/L)all year
pHinstantaneous minimum≥ 6 SUall year
pHinstantaneous maximum≤ 9 SUall year
pHquarterly minimumreport only (SU)all year
pHquarterly maximumreport only (SU)all year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly maximum≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 109 lb/dall year
Solids, total suspendedweekly maximum≤ 163 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedweekly maximumreport only (mg/L)all year
Oil & Greasesingle grab samplereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly average≤ 53.3 lb/dall year
Nitrogen, ammonia total [as N]valuereport only (mg/L)all year
Nitrogen, ammonia total [as N]single grab samplereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
Phosphorus, total [as P]monthly averagereport only (mg/L)Jul–Sep
Phosphorus, total [as P]monthly average≤ 11.2 lb/dJan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
Phosphorus, total [as P]monthly average≤ 5.5 lb/dJul–Sep
Hardness, total [as CaCO3]single grab samplereport only (mg/L)all year
Arsenic, total recoverablemonthly averagereport only (ug/L)all year
Arsenic, total recoverabledaily maximumreport only (ug/L)all year
Arsenic, total recoverablesingle grab samplereport only (ug/L)all year
Zinc, total recoverablesingle samplereport only (ug/L)all year
Zinc, total recoverablesingle grab samplereport only (ug/L)all year
Lead, total recoverablesingle samplereport only (ug/L)all year
Lead, total recoverablesingle grab samplereport only (ug/L)all year
Copper, total recoverablemonthly average≤ 11.7 ug/Lall year
Copper, total recoverabledaily maximum≤ 17.5 ug/Lall year
Copper, total recoverablesingle grab samplereport only (ug/L)all year
E. coli, MTEC-MFmonthly geometric mean≤ 630 #/100mL (alert, not enforceable)Jan, Feb, Mar, Nov, Dec
E. coli, MTEC-MFmonthly geometric mean≤ 126 #/100mLApr–Oct
E. coli, MTEC-MFmaximum 7-day geometric mean≤ 1260 #/100mL (alert, not enforceable)Jan, Feb, Mar, Nov, Dec
E. coli, MTEC-MFmaximum 7-day geometric mean≤ 252 #/100mLApr–Oct
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year

How strict are these limits?

Cited limits by parameter: Montana's rules and the federal ones.

Check this month's numbers Email me before each report is due

· Save this facility as a site · Superfund sites nearby · Your permits on one board

On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MT0022560 · MCP: https://passage-data.com/mcp