Northern Cheyenne Utilities Commission

NPDES permit MT0029360 · Minor POTW · effective, expires 2029-06-30 · 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

78values over a limit
236required values missing, on 16 form(s)
17of 21 forms filed late

Last period with anything received: 2026-07-31. Most often over: Nitrogen, ammonia total [as N] (23), Oxygen, dissolved [DO] (19), E. coli (17).

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 (36)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigrade30DA AVG report only all year
001Temperature, water deg. centigradeDAILY MX <= 20 deg C all year
001Oxygen, dissolved [DO]DAILY MN >= 5 mg/L all year
001Oxygen, dissolved [DO]MH >= 6.5 mg/L all year
001BOD, 5-day, 20 deg. C30DA AVG <= 30 mg/L all year
001BOD, 5-day, 20 deg. C7 DA AVG <= 45 mg/L all year
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspended30DA AVG <= 30 mg/L all year
001Solids, total suspended7 DA AVG <= 45 mg/L all year
001Oil & GreaseDAILY MX <= 10 mg/L all year
001Nitrogen, total [as N]30DA AVG report only all year
001Nitrogen, total [as N]DAILY MX report only all year
001Nitrogen, ammonia total [as N]30DA AVG <= 1.17 mg/L Jan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec
001Nitrogen, ammonia total [as N]30DA AVG <= .64 mg/L Jun, Jul, Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 2.31 mg/L Jan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 2.14 mg/L Jun, Jul, Aug
001Nitrite + Nitrate total [as N]30DA AVG report only all year
001Nitrite + Nitrate total [as N]DAILY MX report only all year
001Phosphorus, total [as P]30DA AVG report only all year
001Phosphorus, total [as P]DAILY MX report only all year
001Chlorine, total residual30DA AVG <= .05 mg/L all year
001Chlorine, total residualDAILY MX <= .05 mg/L all year
001E. coli30DA GM <= 126 #/100mL all year
001E. coliDAILY MX <= 406 #/100mL all year
001Nitrogen, Kjeldahl Total30DA AVG report only all year
001Nitrogen, Kjeldahl TotalDAILY MX report only all year
001Solids, total dissolved [TDS]30DA AVG report only all year
001Solids, total dissolved [TDS]DAILY MX report only all year
001BOD, 5-day, percent removalMO AV MN >= 65 % all year
001Solids, suspended percent removalMO AV MN >= 65 % all year
001Flow, total30DA AVG report only all year
001Flow, totalDAILY MX report only all year
001Oil and grease visualINST MAX <= 0 N=0;Y=1 all year
001IBOD, 5-day, 20 deg. C30DA AVG report only all year
001ISolids, total suspended30DA 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