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Babbitt city of

Sewage treatment plant, Babbitt, Minnesota. NPDES permit MN0020656 expired May 31, 2025; its limits still apply. Last 12 months: over a limit once (last January 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D010 form A1 monthly (38 values), outfall D010 form A2 monthly (2 values), outfall S011 form A1 monthly (12 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 3 required values missing, 0 of 26 reports late

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

Period endingParameterReportedLimitOver by
January 2026Phosphorus, total [as P], monthly average1.1≤ 1 mg/L10%

Limits in force (52)

ParameterStatisticLimitMonthsOutfall
Specific conductancemonthly maximumreport only (umho/cm)all yearD010
Oxygen, dissolved [DO]monthly minimumreport only (mg/L)all yearD010
pHmonthly minimum≥ 6 SUall yearD010
pHmonthly maximum≤ 9 SUall yearD010
Bicarbonate ion- [as HCO3]monthly maximumreport only (mg/L)all yearD010
Solids, total suspendedmonthly averagereport only (mg/L)May, SepD010
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD010
Solids, total suspendeddaily maximumreport only (mg/L)May, SepD010
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall yearD010
Solids, total suspendedmonthly average≤ 56.7 kg/dall yearD010
Solids, total suspendedmaximum weekly average≤ 85.1 kg/dall yearD010
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD010
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Mar, SepD010
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD010
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD010
Phosphorus, total [as P]monthly average≤ 1 mg/Lall yearD010
Phosphorus, total [as P]monthly averagereport only (kg/d)all yearD010
Calcium, total [as Ca]monthly maximumreport only (mg/L)all yearD010
Magnesium, total [as Mg]monthly maximumreport only (mg/L)all yearD010
Sodium, total [as Na]monthly maximumreport only (mg/L)all yearD010
Potassium, total [as K]monthly maximumreport only (mg/L)all yearD010
Chloride [as Cl]monthly maximumreport only (mg/L)all yearD010
Sulfate, total [as SO4]monthly maximumreport only (mg/L)all yearD010
Hardness, Ca Mg Calculated [mg/L as CaCO3]monthly maximumreport only (mg/L)all yearD010
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLApr–OctD010
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD010
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD010
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD010
Chlorine, total residualdaily maximum≤ .038 mg/Lall yearD010
Solids, total dissolvedmonthly maximumreport only (mg/L)all yearD010
Mercury, dissolved [as Hg]monthly averagereport only (ng/L)May, SepD010
Mercury, dissolved [as Hg]daily maximumreport only (ng/L)May, SepD010
Mercury, total [as Hg]monthly average≤ 1.8 ng/LMay, SepD010
Mercury, total [as Hg]daily maximum≤ 3.2 ng/LMay, SepD010
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall yearD010
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/Lall yearD010
BOD, carbonaceous [5 day, 20 C]monthly average≤ 47.3 kg/dall yearD010
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 75.6 kg/dall yearD010
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all yearD010
Solids, suspended percent removalmonthly average minimum≥ 85 %all yearD010
Precipitation, total defined period/inmonthly totalreport only (in)all yearS011
pHmonthly minimumreport only (SU)all yearS011
pHmonthly maximumreport only (SU)all yearS011
Solids, total suspendedmonthly averagereport only (mg/L)all yearS011
Solids, total suspendedmonthly maximumreport only (mg/L)all yearS011
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS011
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS011
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS011
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearS011
Mercury, total [as Hg]monthly averagereport only (ng/L)May, SepS011
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearS011
BOD, carbonaceous [5 day, 20 C]monthly maximumreport only (mg/L)all yearS011

How strict are these limits?

Cited limits by parameter: Minnesota's rules and the federal ones.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MN0020656 · MCP: https://passage-data.com/mcp