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Us Environmental Protection Agency

Federal facility (Testing Laboratories), Duluth, Minnesota. NPDES permit MN0110914, in force until Oct 31, 2030. Last 12 months: over a limit 2 times (last February 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D001 form A1 monthly (6 values), outfall D002 form A1 monthly (19 values)
Last report on file
September 2026

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

Period endingParameterReportedLimitOver by
February 2026Solids, total suspended, daily maximum27≤ 20 mg/L35%
February 2026Solids, total suspended, monthly average13≤ 5 mg/L160%

Limits in force (25)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitdaily maximum≤ 86 deg FMar, Jun, Sep, DecD001
pHquarterly minimum≥ 6 SUMar, Jun, Sep, DecD001
pHquarterly maximum≤ 9 SUMar, Jun, Sep, DecD001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD001
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD001
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD001
pHmonthly minimum≥ 6 SUall yearD002
pHmonthly maximum≤ 9 SUall yearD002
Solids, total suspendedmonthly average≤ 5 mg/Lall yearD002
Solids, total suspendeddaily maximum≤ 20 mg/Lall yearD002
Solids, total suspendedmonthly average≤ 1.51 kg/dall yearD002
Solids, total suspendeddaily maximum≤ 3.48 kg/dall yearD002
Nitrogen, total [as N]monthly averagereport only (mg/L)Mar, SepD002
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)Mar, SepD002
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)Mar, SepD002
Phosphorus, total [as P]monthly average≤ .3 mg/Lall yearD002
Phosphorus, total [as P]monthly average≤ .09 kg/dall yearD002
Sulfate, total [as SO4]monthly averagereport only (mg/L)Mar, Jun, Sep, DecD002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD002
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD002
Flow, in conduit or thru treatment plantmonthly maximumreport only (Mgal/mo)all yearD002
BOD, carbonaceous [5 day, 20 C]monthly average≤ 5 mg/Lall yearD002
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 10 mg/Lall yearD002
BOD, carbonaceous [5 day, 20 C]monthly average≤ 1.51 kg/dall yearD002
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 3.02 kg/dall yearD002

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/MN0110914 · MCP: https://passage-data.com/mcp