CITY OF BILLINGS

NPDES permit MT0022586 · Major POTW · administratively continued, expires 2020-03-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

This permit expired on 2020-03-31 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

0values over a limit
1required values missing, on 1 form(s)
1of 21 forms filed late

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

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 (72)

OutfallParameterStatisticLimitMonths
003Temperature, water deg. centigrade30DA AVG report only all year
003Temperature, water deg. centigradeMAXIMUM report only all year
003Oxygen, dissolved [DO]MO AVG report only all year
003Oxygen, dissolved [DO]MAXIMUM report only all year
003pHDAILY MN >= 6 SU all year
003pHDAILY MX <= 9 SU all year
003Solids, total suspended30DA AVG <= 30 mg/L all year
003Solids, total suspendedMX 7D AV <= 45 mg/L all year
003Solids, total suspended30DA AVG <= 6505 lb/d all year
003Solids, total suspendedMX 7D AV <= 9758 lb/d all year
003Solids, total suspended30DA AVG report only all year
003Solids, total suspendedMX 7D AV report only all year
003Oil & GreaseDAILY MX <= 10 mg/L all year
003Nitrogen, total [as N]MO AVG report only Jan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec
003Nitrogen, total [as N]MO AVG report only Aug, Sep, Oct
003Nitrogen, total [as N]WKLY MAX report only Jan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec
003Nitrogen, total [as N]WKLY MAX report only Aug, Sep, Oct
003Nitrogen, total [as N]MO AVG report only Jan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec
003Nitrogen, total [as N]MO AVG <= 2513 lb/d Aug, Sep, Oct
003Nitrogen, total [as N]WKLY MAX report only Jan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec
003Nitrogen, total [as N]WKLY MAX report only Aug, Sep, Oct
003Nitrogen, ammonia total [as N]MO AVG <= 4 mg/L all year
003Nitrogen, ammonia total [as N]WKLY AVG <= 5.5 mg/L all year
003Nitrogen, Kjeldahl, total [as N]30DA AVG report only all year
003Nitrogen, Kjeldahl, total [as N]MAXIMUM report only all year
003Nitrite + Nitrate total [as N]30DA AVG report only all year
003Nitrite + Nitrate total [as N]MAXIMUM report only all year
003Phosphorus, total [as P]MO AVG report only Jan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec
003Phosphorus, total [as P]MO AVG report only Aug, Sep, Oct
003Phosphorus, total [as P]WKLY MAX report only Jan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec
003Phosphorus, total [as P]WKLY MAX report only Aug, Sep, Oct
003Phosphorus, total [as P]MO AVG report only Jan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec
003Phosphorus, total [as P]MO AVG <= 343 lb/d Aug, Sep, Oct
003Phosphorus, total [as P]WKLY MAX report only Jan, Feb, Mar, Apr, May, Jun, Jul, Nov, Dec
003Phosphorus, total [as P]WKLY MAX report only Aug, Sep, Oct
003Cyanide, total [as CN]SINGSAMP report only all year
003Hardness, total [as CaCO3]SINGSAMP report only all year
003Arsenic, total recoverableSINGSAMP report only all year
003Selenium, total recoverableSINGSAMP report only all year
003Thallium, total recoverableSINGSAMP report only all year
003Beryllium, total recoverable [as Be]SINGSAMP report only all year
003Nickel, total recoverableSINGSAMP report only all year
003Silver total recoverableSINGSAMP report only all year
003Zinc, total recoverableSINGSAMP report only all year
003Cadmium, total recoverableSINGSAMP report only all year
003Lead, total recoverableSINGSAMP report only all year
003Chromium, total recoverableSINGSAMP report only all year
003Copper, total recoverableSINGSAMP report only all year
003Antimony, total recoverableSINGSAMP report only all year
003Total phenolsSINGSAMP report only all year
003E. coli, MTEC-MF30DA GEO <= 126 #/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
003E. coli, MTEC-MF30DA GEO <= 630 #/100mL Jan, Feb, Mar, Nov, Dec
003E. coli, MTEC-MFMX 7D AV <= 252 #/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
003E. coli, MTEC-MFMX 7D AV <= 1260 #/100mL Jan, Feb, Mar, Nov, Dec
003Flow, in conduit or thru treatment plant30DA AVG report only all year
003Flow, in conduit or thru treatment plantDAILY MX report only all year
003Flow, in conduit or thru treatment plant30DA AVG report only all year
003Chlorine, total residualDAILY MX <= .1 mg/L all year
003Solids, total dissolved [TDS]30DA AVG report only all year
003Mercury, total recoverableSINGSAMP report only all year
003BOD, carbonaceous [5 day, 20 C]30DA AVG <= 25 mg/L all year
003BOD, carbonaceous [5 day, 20 C]MX 7D AV <= 40 mg/L all year
003BOD, carbonaceous [5 day, 20 C]30DA AVG <= 5421 lb/d all year
003BOD, carbonaceous [5 day, 20 C]MX 7D AV <= 8674 lb/d all year
003BOD, carbonaceous [5 day, 20 C]30DA AVG report only all year
003BOD, carbonaceous [5 day, 20 C]MX 7D AV report only all year
003BOD, carbonaceous, percent removalMO AV MN >= 85 % all year
003Solids, suspended percent removalMO AV MN >= 85 % all year
003Chemical Oxygen Demand [COD]MO AVG report only all year
003Oil and grease visualINST MAX report only all year
003Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubiaMAXIMUM <= 0 pass=0;fail=1 all year
003Pass/Fail Static Renewal 96Hr Acute Pimephales PromelasMAXIMUM <= 0 pass=0;fail=1 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