Big Piney, Town of

NPDES permit WY0020133 · Minor POTW · effective, expires 2028-03-31 · 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.

EPA's record, 2025-09-01 to 2026-08-31

1values over a limit
4required values missing, on 2 form(s)
2of 40 forms filed late

Last period with anything received: 2026-07-31. Most often over: BOD, 5-day, percent removal (1).

Reporting

Reports are due about 28 days after each monitoring period ends (the most common figure among WY permits in EPA's filings — check your permit).

Limits in force (145)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeDAILY MX report only all year
001Temperature, water deg. centigradeDAILY MX report only all year
001Oxygen, dissolved [DO]DAILY MX report only all year
001BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 45 mg/L all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 45 mg/L all year
001BOD, 5-day, 20 deg. CDAILY MX report only all year
001BOD, 5-day, 20 deg. CDAILY MX report only all year
001BOD, 5-day, 20 deg. CMO AVG report only all year
001BOD, 5-day, 20 deg. CMO AVG report only all year
001BOD, 5-day, 20 deg. CWKLY AVG report only all year
001BOD, 5-day, 20 deg. CWKLY AVG report only all year
001BOD, 5-day, 20 deg. CDAILY MX report only all year
001BOD, 5-day, 20 deg. CDAILY MX report only all year
001pHINST MIN >= 6.5 SU all year
001pHINST MIN >= 6.5 SU all year
001pHINST MAX <= 9 SU all year
001pHINST MAX <= 9 SU all year
001Solids, total suspendedMO AVG <= 100 mg/L all year
001Solids, total suspendedMO AVG <= 100 mg/L all year
001Solids, total suspendedWKLY AVG <= 150 mg/L all year
001Solids, total suspendedWKLY AVG <= 150 mg/L all year
001Solids, total suspendedDAILY MX <= 300 mg/L all year
001Solids, total suspendedDAILY MX <= 300 mg/L all year
001Nitrogen, ammonia total [as N]MO AVG <= 8.3 mg/L Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 8.3 mg/L Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 12.75 mg/L May, Jun, Jul, Aug, Sep
001Nitrogen, ammonia total [as N]MO AVG <= 12.75 mg/L May, Jun, Jul, Aug, Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 21.42 mg/L Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 21.42 mg/L Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 46.58 mg/L May, Jun, Jul, Aug, Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 46.58 mg/L May, Jun, Jul, Aug, Sep
001Nitrite + Nitrate total [as N]DAILY MX report only all year
001Phosphorus, total [as P]DAILY MX report only all year
001DurationMO TOTAL report only all year
001DurationMO TOTAL report only all year
001Chlorine, total residualMO AVG <= .029 mg/L Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Chlorine, total residualMO AVG <= .029 mg/L Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Chlorine, total residualMO AVG <= .064 mg/L May, Jun, Jul, Aug, Sep
001Chlorine, total residualMO AVG <= .064 mg/L May, Jun, Jul, Aug, Sep
001Chlorine, total residualDAILY MX <= .051 mg/L Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Chlorine, total residualDAILY MX <= .051 mg/L Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Chlorine, total residualDAILY MX <= .11 mg/L May, Jun, Jul, Aug, Sep
001Chlorine, total residualDAILY MX <= .11 mg/L May, Jun, Jul, Aug, Sep
001E. coliMO GEOMN <= 1644 #/100mL Jan, Feb, Mar, Oct, Nov, Dec
001E. coliMO GEOMN <= 1644 #/100mL Jan, Feb, Mar, Oct, Nov, Dec
001E. coliMO GEOMN <= 635 #/100mL Apr, May, Jun, Jul, Aug, Sep
001E. coliMO GEOMN <= 635 #/100mL Apr, May, Jun, Jul, Aug, Sep
001E. coliDAILY MX <= 1644 #/100mL Jan, Feb, Mar, Oct, Nov, Dec
001E. coliDAILY MX <= 1644 #/100mL Jan, Feb, Mar, Oct, Nov, Dec
001E. coliDAILY MX <= 3246 #/100mL Apr, May, Jun, Jul, Aug, Sep
001E. coliDAILY MX <= 3246 #/100mL Apr, May, Jun, Jul, Aug, Sep
001Solids, total dissolvedDAILY MX report only all year
001Solids, total dissolvedDAILY MX report only all year
001Solids, total dissolvedDAILY MX <= 400 mg/L all year
001Solids, total dissolvedDAILY MX <= 400 mg/L all year
001FlowMO AVG <= .35 MGD all year
001FlowMO AVG <= .35 MGD all year
001FlowDAILY MX report only all year
001FlowDAILY MX report only all year
001BOD, 5-day, percent removalMO AV MN >= 65 % all year
001BOD, 5-day, percent removalMO AV MN >= 65 % all year
001Produced water, oil and greaseDAILY MX report only all year
002BOD, 5-day, 20 deg. CDAILY MX report only all year
002pHINST MIN report only all year
002pHINST MAX report only all year
002Solids, total suspendedDAILY MX report only all year
002DurationMO TOTAL report only all year
002Chlorine, total residualDAILY MX report only all year
002E. coliDAILY MX report only all year
002Nitrogen, Ammonia TotalDAILY MX report only all year
002FlowDAILY MX report only all year
003Temperature, water deg. centigradeDAILY MX report only all year
003Temperature, water deg. centigradeDAILY MX report only all year
003Oxygen, dissolved [DO]DAILY MX report only all year
003BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
003BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
003BOD, 5-day, 20 deg. CWKLY AVG <= 45 mg/L all year
003BOD, 5-day, 20 deg. CWKLY AVG <= 45 mg/L all year
003BOD, 5-day, 20 deg. CDAILY MX report only all year
003BOD, 5-day, 20 deg. CDAILY MX report only all year
003BOD, 5-day, 20 deg. CMO AVG report only all year
003BOD, 5-day, 20 deg. CMO AVG report only all year
003BOD, 5-day, 20 deg. CWKLY AVG report only all year
003BOD, 5-day, 20 deg. CWKLY AVG report only all year
003BOD, 5-day, 20 deg. CDAILY MX report only all year
003BOD, 5-day, 20 deg. CDAILY MX report only all year
003pHINST MIN >= 6.5 SU all year
003pHINST MIN >= 6.5 SU all year
003pHINST MAX <= 9 SU all year
003pHINST MAX <= 9 SU all year
003Solids, total suspendedMO AVG <= 100 mg/L all year
003Solids, total suspendedMO AVG <= 100 mg/L all year
003Solids, total suspendedWKLY AVG <= 150 mg/L all year
003Solids, total suspendedWKLY AVG <= 150 mg/L all year
003Solids, total suspendedDAILY MX <= 300 mg/L all year
003Solids, total suspendedDAILY MX <= 300 mg/L all year
003Nitrogen, ammonia total [as N]MO AVG <= 12.75 mg/L May, Jun, Jul, Aug, Sep
003Nitrogen, ammonia total [as N]MO AVG <= 12.75 mg/L May, Jun, Jul, Aug, Sep
003Nitrogen, ammonia total [as N]MO AVG <= 8.3 mg/L Jan, Feb, Mar, Apr, Oct, Nov, Dec
003Nitrogen, ammonia total [as N]MO AVG <= 8.3 mg/L Jan, Feb, Mar, Apr, Oct, Nov, Dec
003Nitrogen, ammonia total [as N]DAILY MX <= 46.58 mg/L May, Jun, Jul, Aug, Sep
003Nitrogen, ammonia total [as N]DAILY MX <= 46.58 mg/L May, Jun, Jul, Aug, Sep
003Nitrogen, ammonia total [as N]DAILY MX <= 21.42 mg/L Jan, Feb, Mar, Apr, Oct, Nov, Dec
003Nitrogen, ammonia total [as N]DAILY MX <= 21.42 mg/L Jan, Feb, Mar, Apr, Oct, Nov, Dec
003Nitrite + Nitrate total [as N]DAILY MX report only all year
003Phosphorus, total [as P]DAILY MX report only all year
003DurationMO TOTAL report only all year
003DurationMO TOTAL report only all year
003Chlorine, total residualMO AVG <= .064 mg/L May, Jun, Jul, Aug, Sep
003Chlorine, total residualMO AVG <= .064 mg/L May, Jun, Jul, Aug, Sep
003Chlorine, total residualMO AVG <= .029 mg/L Jan, Feb, Mar, Apr, Oct, Nov, Dec
003Chlorine, total residualMO AVG <= .029 mg/L Jan, Feb, Mar, Apr, Oct, Nov, Dec
003Chlorine, total residualDAILY MX <= .11 mg/L May, Jun, Jul, Aug, Sep
003Chlorine, total residualDAILY MX <= .11 mg/L May, Jun, Jul, Aug, Sep
003Chlorine, total residualDAILY MX <= .051 mg/L Jan, Feb, Mar, Apr, Oct, Nov, Dec
003Chlorine, total residualDAILY MX <= .051 mg/L Jan, Feb, Mar, Apr, Oct, Nov, Dec
003E. coliMO GEOMN <= 1644 #/100mL Jan, Feb, Mar, Oct, Nov, Dec
003E. coliMO GEOMN <= 1644 #/100mL Jan, Feb, Mar, Oct, Nov, Dec
003E. coliMO GEOMN <= 635 #/100mL Apr, May, Jun, Jul, Aug, Sep
003E. coliMO GEOMN <= 635 #/100mL Apr, May, Jun, Jul, Aug, Sep
003E. coliDAILY MX <= 1644 #/100mL Jan, Feb, Mar, Oct, Nov, Dec
003E. coliDAILY MX <= 1644 #/100mL Jan, Feb, Mar, Oct, Nov, Dec
003E. coliDAILY MX <= 3246 #/100mL Apr, May, Jun, Jul, Aug, Sep
003E. coliDAILY MX <= 3246 #/100mL Apr, May, Jun, Jul, Aug, Sep
003Solids, total dissolvedDAILY MX report only all year
003Solids, total dissolvedDAILY MX report only all year
003Solids, total dissolvedDAILY MX <= 400 mg/L all year
003Solids, total dissolvedDAILY MX <= 400 mg/L all year
003FlowMO AVG <= .35 MGD all year
003FlowMO AVG <= .35 MGD all year
003FlowDAILY MX report only all year
003FlowDAILY MX report only all year
003BOD, 5-day, percent removalMO AV MN >= 65 % all year
003BOD, 5-day, percent removalMO AV MN >= 65 % all year
003Produced water, oil and greaseDAILY MX report only all year
CRS1Solids, total dissolvedDAILY MX report only all year
CRS1Solids, total dissolvedDAILY MX report only all year
STR1Temperature, water deg. centigradeINST MAX report only all year
STR1Temperature, water deg. centigradeINST MAX report only all year
STR1pHINST MAX report only all year
STR1pHINST MAX report only all year
STR1pHINST MIN report only all year
STR1pHINST MIN 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