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Three Affiliated Tribes Utilities - MHA Interpretive Center

Schools & Educational Services, New Town, North Dakota. NPDES permit ND0031160 expired Aug 31, 2023; its limits still apply. Last 12 months: over a limit 3 times (last December 2025), 52 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A quarterly (26 values)
Last report on file
March 2026
Oct 2024 – Sep 2025
5 values over a limit, 32 required values missing, 3 of 4 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
December 2025E. coli, 30-day average1020.4 #/100mL≤ 126 #/100mL710%
December 2025E. coli, daily maximum1119.9 #/100mL≤ 410 #/100mL173%
December 2025Solids, suspended percent removal, daily minimum71 %≥ 85 %93%

Limits in force (26)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Flow ratequarterly averagereport only (gal/d)all year
Flow ratequarterly totalreport only (gal/d)all year
BOD, 5-day, 20 deg. C30-day average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. C7-day average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. C30-day averagereport only (mg/L)all year
BOD, 5-day, 20 deg. C7-day averagereport only (mg/L)all year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Solids, total suspended30-day averagereport only (mg/L)all year
Solids, total suspended7-day averagereport only (mg/L)all year
Oil & Greasedaily maximum≤ 10 mg/Lall year
Nitrogen, total [as N]30-day averagereport only (mg/L)all year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]30-day averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]30-day averagereport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Floating solids, waste or visible foam-visualinstantaneous maximum≤ 0 N=0;Y=1all year
E. coli30-day average≤ 126 #/100mLall year
E. colidaily maximum≤ 410 #/100mLall year
BOD, 5-day, percent removaldaily minimum≥ 85 %all year
Solids, suspended percent removaldaily minimum≥ 85 %all year
Oil and grease visualinstantaneous maximum≤ 0 N=0;Y=1all year

How strict are these limits?

Cited limits by parameter: North Dakota's rules and the federal ones.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/ND0031160 · MCP: https://passage-data.com/mcp