Passage Data · Check a report · Use it from your AI

Mountain Iron city of

Sewage treatment plant, Mountain Iron, Minnesota. NPDES permit MN0040835, in force until Dec 31, 2028. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D007 form A1 monthly (29 values), outfall D007 form A2 monthly (2 values), outfall D007 form A3 monthly (1 value), outfall S008 form A1 monthly (18 values), outfall S008 form A2 monthly (2 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 40 reports late

Limits in force (52)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly minimumreport only (mg/L)all yearD007
pHmonthly minimum≥ 6 SUall yearD007
pHmonthly maximum≤ 9 SUall yearD007
Solids, total suspendedmonthly averagereport only (mg/L)May, SepD007
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD007
Solids, total suspendeddaily maximumreport only (mg/L)May, SepD007
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall yearD007
Solids, total suspendedmonthly average≤ 62.4 kg/dall yearD007
Solids, total suspendedmaximum weekly average≤ 93.6 kg/dall yearD007
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD007
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Mar, SepD007
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD007
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD007
Phosphorus, total [as P]monthly average≤ 1 mg/Lall yearD007
Phosphorus, total [as P]monthly averagereport only (kg/d)all yearD007
Phosphorus, total [as P]annual totalreport only (kg/yr)all yearD007
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLApr–OctD007
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD007
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD007
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD007
Chlorine, total residualdaily maximum≤ .038 mg/LApr–OctD007
Solids, total dissolvedmonthly averagereport only (mg/L)Mar, SepD007
Mercury, dissolved [as Hg]monthly averagereport only (ng/L)May, SepD007
Mercury, dissolved [as Hg]daily maximumreport only (ng/L)May, SepD007
Mercury, total [as Hg]monthly average≤ 1.82 ng/LMay, SepD007
Mercury, total [as Hg]daily maximum≤ 3.16 ng/LMay, SepD007
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall yearD007
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/Lall yearD007
BOD, carbonaceous [5 day, 20 C]monthly average≤ 52 kg/dall yearD007
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 83.2 kg/dall yearD007
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all yearD007
Solids, suspended percent removalmonthly average minimum≥ 85 %all yearD007
Precipitation, total defined period/inmonthly totalreport only (in)all yearS008
pHmonthly minimumreport only (SU)all yearS008
pHmonthly maximumreport only (SU)all yearS008
Solids, total suspendedmonthly averagereport only (mg/L)May, SepS008
Solids, total suspendedmonthly averagereport only (mg/L)all yearS008
Solids, total suspendeddaily maximumreport only (mg/L)May, SepS008
Solids, total suspendedmonthly maximumreport only (mg/L)all yearS008
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS008
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS008
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS008
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearS008
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearS008
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearS008
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearS008
Mercury, dissolved [as Hg]monthly averagereport only (ng/L)May, SepS008
Mercury, dissolved [as Hg]daily maximumreport only (ng/L)May, SepS008
Mercury, total [as Hg]monthly averagereport only (ng/L)May, SepS008
Mercury, total [as Hg]daily maximumreport only (ng/L)May, SepS008
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearS008
BOD, carbonaceous [5 day, 20 C]monthly maximumreport only (mg/L)all yearS008

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

· Save this facility as a site · Superfund sites nearby · Your permits on one board

On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MN0040835 · MCP: https://passage-data.com/mcp