CITY OF THIEF RIVER FALLS

NPDES permit MN0021431 · Major POTW · administratively continued, expires 2026-08-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file

This permit expired on 2026-08-31 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
7required values missing, on 1 form(s)
1of 60 forms filed late

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

Reporting

Reports are due about 21 days after each monitoring period ends (the most common figure among MN permits in EPA's filings — check your permit).

Limits in force (75)

OutfallParameterStatisticLimitMonths
D004Oxygen, dissolved [DO]MO MIN report only all year
D004pHMO MIN >= 6 SU all year
D004pHMO MAX <= 9 SU all year
D004Solids, total suspendedMO AVG report only all year
D004Solids, total suspendedMO AVG <= 45 mg/L all year
D004Solids, total suspendedDAILY MX report only all year
D004Solids, total suspendedMX WK AV <= 65 mg/L all year
D004Solids, total suspendedMO AVG <= 2440 kg/d all year
D004Solids, total suspendedMX WK AV <= 3524 kg/d all year
D004Nitrogen, total [as N]MO AVG report only all year
D004Nitrogen, ammonia total [as N]MO AVG report only all year
D004Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
D004Nitrite + Nitrate total [as N]MO AVG report only all year
D004Phosphorus, total [as P]MO AVG report only all year
D004Phosphorus, total [as P]MO AVG report only all year
D004Coliform, fecal MPN + membrane ftl 44.5 CMO GEOMN <= 200 #/100mL May, Jun, Jul, Aug, Sep, Oct
D004Flow, in conduit or thru treatment plantMO AVG report only Mar, Apr, May, Jun, Sep, Oct, Nov, Dec
D004Flow, in conduit or thru treatment plantMO AVG report only Jan, Feb, Jul, Aug
D004Flow, in conduit or thru treatment plantMO MAX report only Mar, Apr, May, Jun, Sep, Oct, Nov, Dec
D004Flow, in conduit or thru treatment plantMO MAX report only Jan, Feb, Jul, Aug
D004Flow, in conduit or thru treatment plantMO TOTAL report only Mar, Apr, May, Jun, Sep, Oct, Nov, Dec
D004Flow, in conduit or thru treatment plantMO TOTAL report only Jan, Feb, Jul, Aug
D004Solids, total dissolvedMO AVG report only all year
D004Mercury, dissolved [as Hg]MO AVG report only all year
D004Mercury, dissolved [as Hg]DAILY MX report only all year
D004Mercury, total [as Hg]MO AVG <= 10.2 ng/L all year
D004Mercury, total [as Hg]DAILY MX <= 19.4 ng/L all year
D004BOD, carbonaceous [5 day, 20 C]MO AVG <= 15 mg/L all year
D004BOD, carbonaceous [5 day, 20 C]MX WK AV <= 40 mg/L all year
D004BOD, carbonaceous [5 day, 20 C]MO AVG <= 813 kg/d all year
D004BOD, carbonaceous [5 day, 20 C]MX WK AV <= 1355 kg/d all year
D005Oxygen, dissolved [DO]MO MIN report only all year
D005pHMO MIN >= 6 SU all year
D005pHMO MAX <= 9 SU all year
D005Solids, total suspendedMO AVG report only all year
D005Solids, total suspendedMO AVG <= 45 mg/L all year
D005Solids, total suspendedDAILY MX report only all year
D005Solids, total suspendedMX WK AV <= 65 mg/L all year
D005Solids, total suspendedMO AVG <= 3632 kg/d all year
D005Solids, total suspendedMX WK AV <= 5246 kg/d all year
D005Nitrogen, total [as N]MO AVG report only all year
D005Nitrogen, ammonia total [as N]MO AVG report only all year
D005Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
D005Nitrite + Nitrate total [as N]MO AVG report only all year
D005Phosphorus, total [as P]MO AVG report only all year
D005Phosphorus, total [as P]MO AVG report only all year
D005Coliform, fecal MPN + membrane ftl 44.5 CMO GEOMN <= 200 #/100mL May, Jun, Jul, Aug, Sep, Oct
D005Flow, in conduit or thru treatment plantMO AVG report only Jan, Feb, Jul, Aug
D005Flow, in conduit or thru treatment plantMO AVG report only Mar, Apr, May, Jun, Sep, Oct, Nov, Dec
D005Flow, in conduit or thru treatment plantMO MAX report only Jan, Feb, Jul, Aug
D005Flow, in conduit or thru treatment plantMO MAX report only Mar, Apr, May, Jun, Sep, Oct, Nov, Dec
D005Flow, in conduit or thru treatment plantMO TOTAL report only Jan, Feb, Jul, Aug
D005Flow, in conduit or thru treatment plantMO TOTAL report only Mar, Apr, May, Jun, Sep, Oct, Nov, Dec
D005Solids, total dissolvedMO AVG report only all year
D005Mercury, dissolved [as Hg]MO AVG report only all year
D005Mercury, dissolved [as Hg]DAILY MX report only all year
D005Mercury, total [as Hg]MO AVG <= 10.2 ng/L all year
D005Mercury, total [as Hg]DAILY MX <= 19.4 ng/L all year
D005BOD, carbonaceous [5 day, 20 C]MO AVG <= 15 mg/L all year
D005BOD, carbonaceous [5 day, 20 C]MX WK AV <= 40 mg/L all year
D005BOD, carbonaceous [5 day, 20 C]MO AVG <= 1211 kg/d all year
D005BOD, carbonaceous [5 day, 20 C]MX WK AV <= 3228 kg/d all year
S008Precipitation, total defined period/inMO TOTAL report only all year
S008pHQB report only Mar, Jun, Sep, Dec
S008Solids, total suspendedQRTR AVG report only Mar, Jun, Sep, Dec
S008Nitrogen, total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
S008Nitrogen, Kjeldahl, total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
S008Nitrite + Nitrate total [as N]QRTR AVG report only Mar, Jun, Sep, Dec
S008Phosphorus, total [as P]QRTR AVG report only Mar, Jun, Sep, Dec
S008Flow, in conduit or thru treatment plantMO AVG report only all year
S008Flow, in conduit or thru treatment plantMO MAX report only all year
S008Flow, in conduit or thru treatment plantMO TOTAL report only all year
S008Mercury, total [as Hg]MO AVG report only all year
S008Mercury, total [as Hg]DAILY MX report only all year
S008BOD, carbonaceous [5 day, 20 C]QRTR AVG report only Mar, Jun, Sep, Dec

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