Three Affiliated Tribes Utilities - MHA Interpretive Center

NPDES permit ND0031160 · Minor NON-POTW · administratively continued, expires 2023-08-31 · 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.

This permit expired on 2023-08-31 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

4values over a limit
52required values missing, on 2 form(s)
1of 4 forms filed late

Last period with anything received: 2026-03-31. Most often over: Solids, suspended percent removal (2), E. coli (2).

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 (26)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeDAILY MX report only all year
001Flow rateQRTR AVG report only all year
001Flow rateQT report only 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
001BOD, 5-day, 20 deg. C30DA AVG report only all year
001BOD, 5-day, 20 deg. C7 DA AVG report only all year
001pHMINIMUM >= 6 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
001Solids, total suspended30DA AVG report only all year
001Solids, total suspended7 DA AVG report only 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 report only all year
001Nitrogen, ammonia 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
001Floating solids, waste or visible foam-visualINST MAX <= 0 N=0;Y=1 all year
001E. coli30DA AVG <= 126 #/100mL all year
001E. coliDAILY MX <= 410 #/100mL all year
001BOD, 5-day, percent removalDAILY MN >= 85 % all year
001Solids, suspended percent removalDAILY MN >= 85 % all year
001Oil and grease visualINST MAX <= 0 N=0;Y=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