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City of Billings

Sewage treatment plant, major discharger, Billings, Montana. NPDES permit MT0022586 expired Mar 31, 2020; its limits still apply. Last 12 months: no values over a limit, 1 required value missing, 1 of 21 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (43 values), form Q quarterly (1 value), form W quarterly (2 values), form S twice a year
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 22 reports late

Limits in force (72)

ParameterStatisticLimitMonths
Temperature, water deg. centigrade30-day averagereport only (deg C)all year
Temperature, water deg. centigrademaximumreport only (deg C)all year
Oxygen, dissolved [DO]monthly averagereport only (mg/L)all year
Oxygen, dissolved [DO]maximumreport only (mg/L)all year
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspendedmaximum 7-day average≤ 45 mg/Lall year
Solids, total suspended30-day average≤ 6505 lb/dall year
Solids, total suspendedmaximum 7-day average≤ 9758 lb/dall year
Solids, total suspended30-day averagereport only (mg/L)all year
Solids, total suspendedmaximum 7-day averagereport only (mg/L)all year
Oil & Greasedaily maximum≤ 10 mg/Lall year
Nitrogen, total [as N]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec
Nitrogen, total [as N]monthly averagereport only (mg/L)Aug–Oct
Nitrogen, total [as N]weekly maximumreport only (mg/L)Jan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec
Nitrogen, total [as N]weekly maximumreport only (mg/L)Aug–Oct
Nitrogen, total [as N]monthly averagereport only (lb/d)Jan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec
Nitrogen, total [as N]monthly average≤ 2513 lb/dAug–Oct
Nitrogen, total [as N]weekly maximumreport only (lb/d)Jan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec
Nitrogen, total [as N]weekly maximumreport only (lb/d)Aug–Oct
Nitrogen, ammonia total [as N]monthly average≤ 4 mg/Lall year
Nitrogen, ammonia total [as N]weekly average≤ 5.5 mg/Lall year
Nitrogen, Kjeldahl, total [as N]30-day averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]maximumreport only (mg/L)all year
Nitrite + Nitrate total [as N]30-day averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]maximumreport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec
Phosphorus, total [as P]monthly averagereport only (mg/L)Aug–Oct
Phosphorus, total [as P]weekly maximumreport only (mg/L)Jan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec
Phosphorus, total [as P]weekly maximumreport only (mg/L)Aug–Oct
Phosphorus, total [as P]monthly averagereport only (lb/d)Jan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec
Phosphorus, total [as P]monthly average≤ 343 lb/dAug–Oct
Phosphorus, total [as P]weekly maximumreport only (lb/d)Jan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec
Phosphorus, total [as P]weekly maximumreport only (lb/d)Aug–Oct
Cyanide, total [as CN]single samplereport only (ug/L)all year
Hardness, total [as CaCO3]single samplereport only (mg/L)all year
Arsenic, total recoverablesingle samplereport only (ug/L)all year
Selenium, total recoverablesingle samplereport only (ug/L)all year
Thallium, total recoverablesingle samplereport only (ug/L)all year
Beryllium, total recoverable [as Be]single samplereport only (ug/L)all year
Nickel, total recoverablesingle samplereport only (ug/L)all year
Silver total recoverablesingle samplereport only (ug/L)all year
Zinc, total recoverablesingle samplereport only (ug/L)all year
Cadmium, total recoverablesingle samplereport only (ug/L)all year
Lead, total recoverablesingle samplereport only (ug/L)all year
Chromium, total recoverablesingle samplereport only (ug/L)all year
Copper, total recoverablesingle samplereport only (ug/L)all year
Antimony, total recoverablesingle samplereport only (ug/L)all year
Total phenolssingle samplereport only (ug/L)all year
E. coli, MTEC-MF30-day geometric mean≤ 126 #/100mLApr–Oct
E. coli, MTEC-MF30-day geometric mean≤ 630 #/100mLJan, Feb, Mar, Nov, Dec
E. coli, MTEC-MFmaximum 7-day average≤ 252 #/100mLApr–Oct
E. coli, MTEC-MFmaximum 7-day average≤ 1260 #/100mLJan, Feb, Mar, Nov, Dec
Flow, in conduit or thru treatment plant30-day averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plant30-day averagereport only (MGD)all year
Chlorine, total residualdaily maximum≤ .1 mg/Lall year
Solids, total dissolved [TDS]30-day averagereport only (mg/L)all year
Mercury, total recoverablesingle samplereport only (ug/L)all year
BOD, carbonaceous [5 day, 20 C]30-day average≤ 25 mg/Lall year
BOD, carbonaceous [5 day, 20 C]maximum 7-day average≤ 40 mg/Lall year
BOD, carbonaceous [5 day, 20 C]30-day average≤ 5421 lb/dall year
BOD, carbonaceous [5 day, 20 C]maximum 7-day average≤ 8674 lb/dall year
BOD, carbonaceous [5 day, 20 C]30-day averagereport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]maximum 7-day averagereport only (mg/L)all year
BOD, carbonaceous, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
Chemical Oxygen Demand [COD]monthly averagereport only (mg/L)all year
Oil and grease visualinstantaneous maximumreport only (N=0;Y=1)all year
Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubiamaximum≤ 0 pass=0;fail=1all year
Pass/Fail Static Renewal 96Hr Acute Pimephales Promelasmaximum≤ 0 pass=0;fail=1all year

How strict are these limits?

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MT0022586 · MCP: https://passage-data.com/mcp