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Big Lake city of

Sewage treatment plant, Big Lake, Minnesota. NPDES permit MN0041076 expired Mar 31, 2023; 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 D015 form A1 monthly (24 values), outfall D015 form A3 monthly (1 value), outfall S016 form A1 monthly (14 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 37 reports late

Limits in force (42)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly minimumreport only (mg/L)all yearD015
pHmonthly minimum≥ 6 SUall yearD015
pHmonthly maximum≤ 9 SUall yearD015
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD015
Solids, total suspendedmonthly maximumreport only (mg/L)JulD015
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall yearD015
Solids, total suspendedmonthly average≤ 41.2 kg/dall yearD015
Solids, total suspendedmaximum weekly average≤ 61.7 kg/dall yearD015
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD015
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Mar, SepD015
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD015
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD015
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearD015
Phosphorus, total [as P]monthly averagereport only (kg/d)all yearD015
Phosphorus, total [as P]annual total≤ 1160 kg/yrall yearD015
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLApr–OctD015
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD015
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD015
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD015
Solids, total dissolvedmonthly averagereport only (mg/L)Mar, SepD015
Mercury, dissolved [as Hg]monthly maximumreport only (ng/L)JulD015
Mercury, total [as Hg]monthly maximumreport only (ng/L)JulD015
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall yearD015
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/Lall yearD015
BOD, carbonaceous [5 day, 20 C]monthly average≤ 34.3 kg/dall yearD015
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 54.9 kg/dall yearD015
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all yearD015
Solids, suspended percent removalmonthly average minimum≥ 85 %all yearD015
Precipitation, total defined period/inmonthly totalreport only (in)all yearS016
pHmonthly minimumreport only (SU)all yearS016
pHmonthly maximumreport only (SU)all yearS016
Solids, total suspendedmonthly averagereport only (mg/L)all yearS016
Solids, total suspendedmonthly maximumreport only (mg/L)all yearS016
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS016
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS016
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS016
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearS016
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearS016
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearS016
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearS016
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearS016
BOD, carbonaceous [5 day, 20 C]monthly maximumreport only (mg/L)all yearS016

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/MN0041076 · MCP: https://passage-data.com/mcp