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Sewage treatment plant, Fort Yates, North Dakota. NPDES permit ND0031135 expired Dec 31, 2023; its limits still apply. Last 12 months: over a limit 6 times (last January 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 30 days after each period: form A quarterly (16 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
3 values over a limit, 0 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
January 2026BOD, 5-day, 20 deg. C, 30-day average47.6 mg/L≤ 30 mg/L59%
January 2026BOD, 5-day, 20 deg. C, 7-day average47.6 mg/L≤ 45 mg/L6%
January 2026E. coli, 30-day average658.6 #/100mL≤ 126 #/100mL423%
January 2026E. coli, daily maximum658.6 #/100mL≤ 410 #/100mL61%
January 2026Solids, total suspended, 30-day average49 mg/L≤ 30 mg/L63%
January 2026Solids, total suspended, 7-day average49 mg/L≤ 45 mg/L9%

Limits in force (16)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)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
pHminimum≥ 6.5 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Oil & Greasedaily maximum≤ 10 mg/Lall year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
E. coli30-day average≤ 126 #/100mLall year
E. colidaily maximum≤ 410 #/100mLall year
Flow, total30-day averagereport only (MGD)all year
Flow, totaldaily maximumreport only (MGD)all year

How strict are these limits?

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

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/ND0031135 · MCP: https://passage-data.com/mcp