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North Koochiching Area Sanitary District

Sewage treatment plant, major discharger, International Falls, Minnesota. NPDES permit MN0020257 expired Feb 28, 2026; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D053 form A1 monthly (27 values), outfall D053 form A2 monthly (1 value), outfall D053 form A3 monthly (1 value), outfall S054 form A1 monthly (14 values), outfall S055 form A1 monthly (5 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 52 reports late

Limits in force (48)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly minimumreport only (mg/L)all yearD053
pHmonthly minimum≥ 6 SUall yearD053
pHmonthly maximum≤ 9 SUall yearD053
Solids, total suspendedmonthly averagereport only (mg/L)Mar, Jun, Sep, DecD053
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD053
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall yearD053
Solids, total suspendedmonthly average≤ 261 kg/dall yearD053
Solids, total suspendedmaximum weekly average≤ 391 kg/dall yearD053
Nitrogen, total [as N]monthly averagereport only (mg/L)all yearD053
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all yearD053
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all yearD053
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all yearD053
Phosphorus, total [as P]monthly average≤ 1 mg/Lall yearD053
Phosphorus, total [as P]monthly averagereport only (kg/d)all yearD053
Phosphorus, total [as P]annual total≤ 3318 kg/yrall yearD053
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLApr–OctD053
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD053
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD053
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD053
Chlorine, total residualdaily maximum≤ .038 mg/Lall yearD053
Solids, total dissolvedmonthly averagereport only (mg/L)Mar, SepD053
Mercury, total [as Hg]monthly average≤ 9.1 ng/LMar, Jun, Sep, DecD053
Mercury, total [as Hg]daily maximum≤ 14.3 ng/LMar, Jun, Sep, DecD053
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall yearD053
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/Lall yearD053
BOD, carbonaceous [5 day, 20 C]monthly average≤ 284 kg/dall yearD053
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 453.6 kg/dall yearD053
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all yearD053
Solids, suspended percent removalmonthly average minimum≥ 85 %all yearD053
Precipitation, total defined period/inmonthly totalreport only (in)all yearS054
pHmonthly minimumreport only (SU)all yearS054
pHmonthly maximumreport only (SU)all yearS054
Solids, total suspendedmonthly averagereport only (mg/L)all yearS054
Solids, total suspendedmonthly maximumreport only (mg/L)all yearS054
Nitrogen, total [as N]monthly averagereport only (mg/L)all yearS054
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all yearS054
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all yearS054
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearS054
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearS054
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearS054
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearS054
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearS054
BOD, carbonaceous [5 day, 20 C]monthly maximumreport only (mg/L)all yearS054
Solids, total suspendedmonthly averagereport only (mg/L)all yearS055
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearS055
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearS055
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearS055
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearS055

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/MN0020257 · MCP: https://passage-data.com/mcp