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Hibbing city of

Sewage treatment plant, major discharger, Hibbing, Minnesota. NPDES permit MN0030643 expired Nov 30, 2025; its limits still apply. Last 12 months: over a limit once (last March 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D013 form A1 monthly (36 values), outfall D013 form A2 monthly (2 values), outfall S015 form A1 monthly (13 values), outfall S015 form A2 monthly (1 value)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 11 required values missing, 0 of 36 reports late

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

Period endingParameterReportedLimitOver by
March 2026Oxygen, dissolved [DO], monthly minimum12.4≥ 12.5 mg/L1%

Limits in force (63)

ParameterStatisticLimitMonthsOutfall
Specific conductancemonthly maximumreport only (umho/cm)all yearD013
Oxygen, dissolved [DO]monthly minimum≥ 12.5 mg/LJan, Feb, Mar, DecD013
Oxygen, dissolved [DO]monthly minimum≥ 7.8 mg/LApr–NovD013
pHmonthly minimum≥ 6 SUall yearD013
pHmonthly maximum≤ 9 SUall yearD013
Solids, total suspendedmonthly averagereport only (mg/L)Jan, Mar, May, Jul, Sep, NovD013
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD013
Solids, total suspendeddaily maximumreport only (mg/L)Jan, Mar, May, Jul, Sep, NovD013
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall yearD013
Solids, total suspendedmonthly average≤ 510 kg/dall yearD013
Solids, total suspendedmaximum weekly average≤ 766 kg/dall yearD013
Nitrogen, total [as N]monthly averagereport only (mg/L)all yearD013
Nitrogen, ammonia total [as N]monthly average≤ 8.8 mg/LApr, MayD013
Nitrogen, ammonia total [as N]monthly average≤ 1.3 mg/LJun–SepD013
Nitrogen, ammonia total [as N]monthly average≤ 4.9 mg/LOct, NovD013
Nitrogen, ammonia total [as N]monthly average≤ 6.7 mg/LJan, Feb, Mar, DecD013
Nitrogen, ammonia total [as N]monthly average≤ 150 kg/dApr, MayD013
Nitrogen, ammonia total [as N]monthly average≤ 22 kg/dJun–SepD013
Nitrogen, ammonia total [as N]monthly average≤ 83 kg/dOct, NovD013
Nitrogen, ammonia total [as N]monthly average≤ 114 kg/dJan, Feb, Mar, DecD013
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all yearD013
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all yearD013
Phosphorus, total [as P]monthly average≤ 1 mg/Lall yearD013
Phosphorus, total [as P]monthly average≤ 17 kg/dall yearD013
Chloride [as Cl]monthly maximumreport only (mg/L)all yearD013
Copper, total [as Cu]quarterly maximumreport only (ug/L)Mar, Jun, Sep, DecD013
Hardness, Ca Mg Calculated [mg/L as CaCO3]monthly maximumreport only (mg/L)all yearD013
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLApr–OctD013
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD013
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD013
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD013
Chlorine, total residualdaily maximum≤ .038 mg/Lall yearD013
Solids, total dissolvedmonthly maximumreport only (mg/L)all yearD013
Mercury, dissolved [as Hg]monthly averagereport only (ng/L)Jan, Mar, May, Jul, Sep, NovD013
Mercury, dissolved [as Hg]daily maximumreport only (ng/L)Jan, Mar, May, Jul, Sep, NovD013
Mercury, total [as Hg]monthly average≤ 1.8 ng/LJan, Mar, May, Jul, Sep, NovD013
Mercury, total [as Hg]daily maximum≤ 3.2 ng/LJan, Mar, May, Jul, Sep, NovD013
Mercury, total [as Hg]monthly average≤ 30.6 mg/dJan, Mar, May, Jul, Sep, NovD013
Mercury, total [as Hg]daily maximum≤ 54.4 mg/dJan, Mar, May, Jul, Sep, NovD013
BOD, carbonaceous [5 day, 20 C]monthly average≤ 7.7 mg/LJan, Feb, Mar, DecD013
BOD, carbonaceous [5 day, 20 C]monthly average≤ 9.4 mg/LApr–NovD013
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 12 mg/LJan, Feb, Mar, DecD013
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 15 mg/LApr–NovD013
BOD, carbonaceous [5 day, 20 C]monthly average≤ 131 kg/dJan, Feb, Mar, DecD013
BOD, carbonaceous [5 day, 20 C]monthly average≤ 160 kg/dApr–NovD013
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 204 kg/dJan, Feb, Mar, DecD013
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 255 kg/dApr–NovD013
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all yearD013
Solids, suspended percent removalmonthly average minimum≥ 85 %all yearD013
Precipitation, total defined period/inmonthly totalreport only (in)all yearS015
pHmonthly minimumreport only (SU)all yearS015
pHmonthly maximumreport only (SU)all yearS015
Solids, total suspendedmonthly averagereport only (mg/L)Jan, Mar, May, Jul, Sep, NovS015
Solids, total suspendedmonthly averagereport only (mg/L)all yearS015
Solids, total suspendedmonthly maximumreport only (mg/L)all yearS015
Nitrogen, total [as N]monthly averagereport only (mg/L)all yearS015
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all yearS015
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all yearS015
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearS015
Mercury, dissolved [as Hg]monthly averagereport only (ng/L)Jan, Mar, May, Jul, Sep, NovS015
Mercury, total [as Hg]monthly averagereport only (ng/L)Jan, Mar, May, Jul, Sep, NovS015
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearS015
BOD, carbonaceous [5 day, 20 C]monthly maximumreport only (mg/L)all yearS015

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/MN0030643 · MCP: https://passage-data.com/mcp