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Grand Portage Reservation WWSL

Sewage treatment plant, Grand Portage, Minnesota. NPDES permit MN0025887, in force until Aug 29, 2027. Last 12 months: no values over a limit, 261 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: form A quarterly (54 values), form Q quarterly (12 values)
Renewal application due
Mar 2, 2027 · 180 days before expiry; your permit may set another date
Last report on file
None
Oct 2024 – Sep 2025
7 values over a limit, 180 required values missing, 0 of 16 reports late

Limits in force (66)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimumreport only (mg/L)all year
Oxygen, dissolved [DO]daily minimumreport only (mg/L)all year
pHminimum≥ 6 SUall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
pHmaximum≤ 9 SUall year
pHminimumreport only (SU)all year
pHminimumreport only (SU)all year
pHmaximumreport only (SU)all year
pHmaximumreport only (SU)all year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 68 kg/dall year
Solids, total suspendedmonthly average≤ 68 kg/dall year
Solids, total suspendedweekly average≤ 102 kg/dall year
Solids, total suspendedweekly average≤ 102 kg/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly average≤ .5 mg/Lall year
Phosphorus, total [as P]monthly average≤ .5 mg/Lall year
Phosphorus, total [as P]daily maximum≤ 1 mg/Lall year
Phosphorus, total [as P]daily maximum≤ 1 mg/Lall year
Phosphorus, total [as P]monthly average≤ 1.13 kg/dall year
Phosphorus, total [as P]monthly average≤ 1.13 kg/dall year
Phosphorus, total [as P]daily maximum≤ 2.27 kg/dall year
Phosphorus, total [as P]daily maximum≤ 2.27 kg/dall year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Rainfalltotalreport only (in)all year
Rainfalltotalreport only (in)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantweekly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantweekly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
E. coli30-day geometric mean≤ 126 #/100mLall year
E. coli30-day geometric mean≤ 126 #/100mLall year
E. colidaily maximum≤ 235 #/100mLall year
E. colidaily maximum≤ 235 #/100mLall year
Mercury, total [as Hg]monthly average≤ 2.26 ng/Lall year
Mercury, total [as Hg]monthly average≤ 2.26 ng/Lall year
Mercury, total [as Hg]monthly average≤ .00000513 kg/dall year
Mercury, total [as Hg]monthly average≤ .00000513 kg/dall year
Mercury, total [as Hg]monthly averagereport only (ng/L)all year
Mercury, total [as Hg]monthly averagereport only (ng/L)all year
BOD, carbonaceous [5 day, 20 C]30-day average≤ 25 mg/Lall year
BOD, carbonaceous [5 day, 20 C]30-day average≤ 25 mg/Lall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 40 mg/Lall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 40 mg/Lall year
BOD, carbonaceous [5 day, 20 C]30-day average≤ 57 kg/dall year
BOD, carbonaceous [5 day, 20 C]30-day average≤ 57 kg/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 91 kg/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 91 kg/dall year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year
Solids, suspended percent removalminimum≥ 85 %all year
Solids, suspended percent removalminimum≥ 85 %all year
Carbonaceous oxygen demand, % removalminimum≥ 85 %all year
Carbonaceous oxygen demand, % removalminimum≥ 85 %all year
Outfall observation,visual, y/n responsemonthly averagereport only (Y=0;N=1)all year
Outfall observation,visual, y/n responsemonthly averagereport only (Y=0;N=1)all year

How strict are these limits?

Cited limits by parameter: Minnesota'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/MN0025887 · MCP: https://passage-data.com/mcp