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Wolf Point, City of

Sewage treatment plant, Wolf Point, Montana. NPDES permit MT0030571 expired Jun 30, 2023; its limits still apply. Last 12 months: over a limit 5 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (21 values), form R monthly (4 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
4 values over a limit, 0 required values missing, 2 of 24 reports late

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

Period endingParameterReportedLimitOver by
November 2025BOD, 5-day, 20 deg. C, 30-day average220 mg/L≤ 30 mg/L633%
November 2025BOD, 5-day, 20 deg. C, 7-day average270 mg/L≤ 45 mg/L500%
June 2026BOD, 5-day, 20 deg. C, 30-day average55.67 mg/L≤ 30 mg/L86%
June 2026BOD, 5-day, 20 deg. C, 7-day average61 mg/L≤ 45 mg/L36%
June 2026Solids, total suspended, 30-day average31.33 mg/L≤ 30 mg/L4%

Limits in force (27)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Oxygen, dissolved [DO]daily maximumreport only (mg/L)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
pHminimumreport only (SU)all year
pHmaximumreport only (SU)all 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, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrogen, nitrite total [as N]daily maximumreport only (mg/L)all year
Nitrogen, nitrate total [as N]daily maximumreport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
E. coli30-day geometric mean≤ 126 #/100mLApr–Oct
E. coli30-day geometric mean≤ 630 #/100mLJan, Feb, Mar, Nov, Dec
E. colidaily maximum≤ 252 #/100mLApr–Oct
E. colidaily maximum≤ 1260 #/100mLJan, Feb, Mar, Nov, Dec
Solids, total dissolveddaily maximumreport only (mg/L)all year
Flow30-day averagereport only (MGD)all year
Flowdaily maximumreport only (MGD)all year
Oil and grease visualinstantaneous maximum≤ 0 N=0;Y=1all year

How strict are these limits?

Cited limits by parameter: Montana'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/MT0030571 · MCP: https://passage-data.com/mcp