CITY OF DILLON

NPDES permit MT0021458 · Minor POTW · administratively continued, expires 2022-06-30 · 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.

This permit expired on 2022-06-30 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)
8of 24 forms filed late

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

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 (39)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeMO AVG report only all year
001Temperature, water deg. centigradeWKLY MAX report only all year
001Temperature, water deg. centigradeMO AVG report only all year
001Flow rateMO AVG report only all year
001pHDAILY MN >= 6 SU all year
001pHDAILY MX <= 9 SU all year
001pHMINIMUM report only all year
001pHMAXIMUM report only all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedMX WK AV <= 45 mg/L all year
001Solids, total suspendedMO AVG <= 188 lb/d all year
001Solids, total suspendedMX WK AV <= 281 lb/d all year
001Solids, total suspendedMO AVG report only all year
001Solids, total suspendedMO AVG report only all year
001Oil and grease, hexane extr methodMO MAX <= 10 mg/L Jun, Dec
001Nitrogen, total [as N]MO AVG report only Jun, Jul, Aug, Sep
001Nitrogen, total [as N]MX WK AV report only Jun, Jul, Aug, Sep
001Nitrogen, total [as N]MO AVG <= 145.4 lb/d Jun, Jul, Aug, Sep
001Nitrogen, total [as N]MX WK AV report only Jun, Jul, Aug, Sep
001Nitrogen, ammonia total [as N]MO AVG report only all year
001Nitrogen, ammonia total [as N]DAILY MX report only all year
001Nitrogen, ammonia total [as N]DAILY MX report only Mar, Jun, Sep, Dec
001Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
001Nitrite + Nitrate total [as N]MO AVG report only all year
001Phosphorus, total [as P]MO AVG report only Jun, Jul, Aug, Sep
001Phosphorus, total [as P]MO AVG <= 19.4 lb/d Jun, Jul, Aug, Sep
001E. coli, MTEC-MFMOAV GEO <= 630 CFU/100mL Jan, Feb, Mar, Nov, Dec
001E. coli, MTEC-MFMOAV GEO <= 126 CFU/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
001E. coli, MTEC-MFWKLY MAX <= 1260 CFU/100mL Jan, Feb, Mar, Nov, Dec
001E. coli, MTEC-MFWKLY MAX <= 252 CFU/100mL Apr, May, Jun, Jul, Aug, Sep, Oct
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 25 mg/L all year
001BOD, carbonaceous [5 day, 20 C]MX WK AV <= 40 mg/L all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 156 lb/d all year
001BOD, carbonaceous [5 day, 20 C]MX WK AV <= 250 lb/d all year
001BOD, carbonaceous [5 day, 20 C]MO AVG report only all year
001BOD, carbonaceous [5 day, 20 C]MO AVG report only all year
001BOD, carbonaceous, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
001Oil and grease visualVALUE 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