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Marble city of

Sewage treatment plant, Marble, Minnesota. NPDES permit MN0020214 expired Sep 30, 2024; 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 D006 form A1 monthly (25 values), outfall S007 form A1 monthly (11 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 0 of 25 reports late

Limits in force (39)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly minimumreport only (mg/L)all yearD006
pHmonthly minimum≥ 6 SUall yearD006
pHmonthly maximum≤ 9 SUall yearD006
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD006
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall yearD006
Solids, total suspendedmonthly maximumreport only (mg/L)JulD006
Solids, total suspendedmonthly average≤ 36.7 kg/dall yearD006
Solids, total suspendedmaximum weekly average≤ 55.1 kg/dall yearD006
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD006
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Mar, SepD006
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD006
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD006
Phosphorus, total [as P]monthly average≤ 1 mg/Lall yearD006
Phosphorus, total [as P]monthly average≤ 1.23 kg/dall yearD006
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLApr–OctD006
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD006
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD006
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD006
Chlorine, total residualdaily maximum≤ .038 mg/Lall yearD006
Solids, total dissolvedmonthly averagereport only (mg/L)Mar, SepD006
Mercury, dissolved [as Hg]monthly maximumreport only (ng/L)JulD006
Mercury, total [as Hg]monthly maximumreport only (ng/L)JulD006
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall yearD006
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/Lall yearD006
BOD, carbonaceous [5 day, 20 C]monthly average≤ 30.6 kg/dall yearD006
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 49 kg/dall yearD006
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all yearD006
Solids, suspended percent removalmonthly average minimum≥ 85 %all yearD006
Precipitation, total defined period/inmonthly totalreport only (in)all yearS007
pHmonthly minimumreport only (SU)all yearS007
pHmonthly maximumreport only (SU)all yearS007
Solids, total suspendedmonthly averagereport only (mg/L)all yearS007
Solids, total suspendedmonthly maximumreport only (mg/L)all yearS007
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS007
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS007
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS007
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearS007
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearS007
BOD, carbonaceous [5 day, 20 C]monthly maximumreport only (mg/L)all yearS007

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/MN0020214 · MCP: https://passage-data.com/mcp