STILLWATER COUNTY COMMISSIONERS

NPDES permit MT0021750 · Minor POTW · administratively continued, expires 2022-01-31 · 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 2022-01-31 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
0required values missing, on 0 form(s)
4of 56 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 (85)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. fahrenheitMAXIMUM report only all year
001Flow rate30DA AVG report only all year
001Oxygen, dissolved [DO]SINGSAMP report only all year
001BOD, 5-day, 20 deg. C30DA AVG <= 30 mg/L all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 45 mg/L all year
001BOD, 5-day, 20 deg. C30DA AVG <= 75 lb/d all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 131 lb/d all year
001BOD, 5-day, 20 deg. C30DA AVG report only all year
001pHINST MIN >= 6 SU all year
001pHINST MAX <= 9 SU all year
001Solids, total suspended30DA AVG <= 45 mg/L all year
001Solids, total suspended7 DA AVG <= 65 mg/L all year
001Solids, total suspended30DA AVG <= 131 lb/d all year
001Solids, total suspended7 DA AVG <= 190 lb/d all year
001Solids, total suspended30DA AVG report only all year
001Oil and grease, hexane extr methodMO AVG report only all year
001Nitrogen, total [as N]MO AVG report only Jul, Aug, Sep
001Nitrogen, total [as N]MO AVG report only Jul, Aug, Sep
001Nitrogen, ammonia total [as N]MO AVG <= 4.9 mg/L all year
001Nitrogen, ammonia total [as N]DAILY MX <= 7.2 mg/L all year
001Nitrogen, Kjeldahl, total [as N]MO AVG report only Jul, Aug, Sep
001Nitrite + Nitrate total [as N]MO AVG report only all year
001Phosphorus, total [as P]MO AVG report only Jul, Aug, Sep
001Phosphorus, total [as P]MO AVG report only Jul, Aug, Sep
001Hardness, total [as CaCO3]MO AVG report only all year
001Cadmium, total recoverableMO AVG report only all year
001Lead, total recoverableMO AVG report only all year
001E. coli, MTEC-MF30DA AVG <= 630 CFU/100mL Jan, Feb, Mar, Nov, Dec
001E. coli, MTEC-MF30DA AVG <= 126 CFU/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
001E. coli, MTEC-MF7 DA AVG <= 1260 CFU/100mL Jan, Feb, Mar, Nov, Dec
001E. coli, MTEC-MF7 DA AVG <= 252 CFU/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
001Mercury, total recoverableMO AVG report only all year
001BOD, 5-day, percent removalMINIMUM >= 85 % all year
001Solids, suspended percent removalMINIMUM >= 65 % all year
01ATemperature, water deg. fahrenheitMAXIMUM report only all year
01AFlow rate30DA AVG report only all year
01AOxygen, dissolved [DO]SINGSAMP report only all year
01ABOD, 5-day, 20 deg. C30DA AVG <= 30 mg/L all year
01ABOD, 5-day, 20 deg. CWKLY AVG <= 45 mg/L all year
01ABOD, 5-day, 20 deg. C30DA AVG <= 75 lb/d all year
01ABOD, 5-day, 20 deg. CWKLY AVG <= 131 lb/d all year
01ABOD, 5-day, 20 deg. C30DA AVG report only all year
01ApHINST MIN >= 6 SU all year
01ApHINST MAX <= 9 SU all year
01ASolids, total suspended30DA AVG <= 45 mg/L all year
01ASolids, total suspended7 DA AVG <= 65 mg/L all year
01ASolids, total suspended30DA AVG <= 131 lb/d all year
01ASolids, total suspended7 DA AVG <= 190 lb/d all year
01ASolids, total suspended30DA AVG report only all year
01AOil and grease, hexane extr methodMO AVG report only all year
01ANitrogen, total [as N]MO AVG report only Jul, Aug, Sep
01ANitrogen, total [as N]MO AVG report only Jul, Aug, Sep
01ANitrogen, ammonia total [as N]MO AVG <= 11 mg/L all year
01ANitrogen, ammonia total [as N]DAILY MX <= 16.1 mg/L all year
01ANitrogen, Kjeldahl, dissolved [as N]MO AVG report only Jul, Aug, Sep
01ANitrite + Nitrate total [as N]MO AVG report only all year
01APhosphorus, total [as P]MO AVG report only Jul, Aug, Sep
01APhosphorus, total [as P]MO AVG report only Jul, Aug, Sep
01AHardness, total [as CaCO3]MO AVG report only all year
01ACadmium, total recoverableMO AVG report only all year
01ALead, total recoverableMO AVG report only all year
01AE. coli, MTEC-MF30DA AVG <= 126 CFU/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
01AE. coli, MTEC-MF30DA AVG <= 630 CFU/100mL Jan, Feb, Mar, Nov, Dec
01AE. coli, MTEC-MF7 DA AVG <= 252 CFU/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
01AE. coli, MTEC-MF7 DA AVG <= 1260 CFU/100mL Jan, Feb, Mar, Nov, Dec
01AMercury, total recoverableMO AVG report only all year
01ABOD, 5-day, percent removalMINIMUM >= 85 % all year
01ASolids, suspended percent removalMINIMUM >= 65 % all year
DITTemperature, water deg. fahrenheitSINGGRAB report only all year
DITFlow rateMO AVG report only all year
DITFlow rateDAILY MX report only all year
DITpHSINGGRAB report only all year
DITNitrogen, total [as N]SINGGRAB report only Jul, Aug, Sep
DITNitrogen, ammonia total [as N]SINGGRAB report only all year
DITPhosphorus, total [as P]SINGGRAB report only Jul, Aug, Sep
ROSCTemperature, water deg. fahrenheitSINGGRAB report only all year
ROSCpHSINGGRAB report only all year
ROSCNitrogen, total [as N]SINGGRAB report only Jul, Aug, Sep
ROSCNitrogen, ammonia total [as N]SINGGRAB report only all year
ROSCPhosphorus, total [as P]SINGGRAB report only Jul, Aug, Sep
ROSCHardness, total [as CaCO3]MO AVG report only all year
ROSCCadmium, total recoverableMO AVG report only all year
ROSCLead, total recoverableMO AVG report only all year
ROSCCopper, total recoverableSINGGRAB report only all year
ROSCMercury, total recoverableMO AVG 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