Gillette, City of

NPDES permit WY0020125 · Major POTW · effective, expires 2027-07-31 · 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

0values over a limit
0required values missing, on 0 form(s)
0of 18 forms filed late

Last period with anything received: 2026-08-31.

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 (41)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeDAILY MX report only all year
001Temperature, water deg. centigradeMO AVG report only all year
001Oxygen, dissolved [DO]DAILY MX report only all year
001pHINST MIN >= 6.5 SU all year
001pHINST MAX <= 9 SU all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedWKLY AVG <= 45 mg/L all year
001Solids, total suspendedDAILY MX report only all year
001Solids, total suspendedMO AVG report only all year
001Solids, total suspendedDAILY MX report only all year
001Solids, total suspendedWKLY AVG report only all year
001Nitrogen, ammonia total [as N]DAILY MX report only all year
001Nitrogen, ammonia total [as N]WKLY AVG report only all year
001Nitrogen, ammonia total [as N]MO AVG report only all year
001Nitrite + Nitrate total [as N]DAILY MX report only all year
001Phosphorus, total [as P]DAILY MX report only all year
001ChlorideDAILY MX report only all year
001DurationMO TOTAL report only all year
001Chlorine, total residualDAILY MX <= .019 mg/L all year
001E. coliMO GEOMN <= 126 #/100mL May, Jun, Jul, Aug, Sep
001E. coliMO GEOMN <= 630 #/100mL Jan, Feb, Mar, Apr, Oct, Nov, Dec
001E. coliDAILY MX <= 235 #/100mL May, Jun, Jul, Aug, Sep
001E. coliDAILY MX <= 630 #/100mL Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Solids, total dissolvedDAILY MX report only all year
001FlowMO AVG report only all year
001FlowDAILY MX report only all year
001FlowDAILY MX report only all year
001FlowMO AVG report only all year
001FlowMO AVG report only all year
001FlowDAILY MX report only all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 25 mg/L all year
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 40 mg/L all year
001BOD, carbonaceous [5 day, 20 C]DAILY MX report only all year
001BOD, carbonaceous [5 day, 20 C]MO AVG report only all year
001BOD, carbonaceous [5 day, 20 C]WKLY AVG report only all year
001BOD, carbonaceous [5 day, 20 C]DAILY MX report only all year
001BOD, carbonaceous, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
001Produced water, oil and greaseDAILY MX <= 10 mg/L all year
001Pass/Fail Static Renewal 7Day Chronic Pimephales promelas7E <= 0 pass=0;fail=1 all year
001Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia7E <= 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