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Mountain Lake city of

Sewage treatment plant, Mountain Lake, Minnesota. NPDES permit MN0021466 expired Aug 31, 2023; its limits still apply. Last 12 months: over a limit 2 times (last December 2025), 11 required values missing, 1 of 48 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D001 form A1 monthly (32 values), outfall D001 form A2 monthly (4 values), outfall D001 form A3 monthly (2 values), outfall S002 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 48 reports late

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

Period endingParameterReportedLimitOver by
December 2025Phosphorus, total [as P], year-to-date total1352.6≤ 655 kg/yr107%
December 2025pH, monthly minimum4.48≥ 6 SU—

Limits in force (53)

ParameterStatisticLimitMonthsOutfall
Specific conductancemonthly maximumreport only (umho/cm)all yearD001
Oxygen, dissolved [DO]monthly minimumreport only (mg/L)all yearD001
pHmonthly minimum≥ 6 SUall yearD001
pHmonthly maximum≤ 9 SUall yearD001
Bicarbonate ion- [as HCO3]monthly maximumreport only (mg/L)all yearD001
Solids, total suspendedmonthly averagereport only (mg/L)all yearD001
Solids, total suspendedmonthly average≤ 45 mg/Lall yearD001
Solids, total suspendeddaily maximumreport only (mg/L)all yearD001
Solids, total suspendedmaximum weekly average≤ 65 mg/Lall yearD001
Solids, total suspendedmonthly average≤ 701 kg/dall yearD001
Solids, total suspendedmaximum weekly average≤ 1012.6 kg/dall yearD001
Nitrogen, total [as N]monthly averagereport only (mg/L)all yearD001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all yearD001
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all yearD001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all yearD001
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearD001
Phosphorus, total [as P]monthly averagereport only (kg/d)all yearD001
Phosphorus, total [as P]year-to-date total≤ 655 kg/yrall yearD001
Calcium, total [as Ca]monthly maximumreport only (mg/L)all yearD001
Magnesium, total [as Mg]monthly maximumreport only (mg/L)all yearD001
Sodium, total [as Na]monthly maximumreport only (mg/L)all yearD001
Potassium, total [as K]monthly maximumreport only (mg/L)all yearD001
Chloride [as Cl]monthly maximumreport only (mg/L)all yearD001
Sulfate, total [as SO4]monthly maximumreport only (mg/L)all yearD001
Hardness, Ca Mg Calculated [mg/L as CaCO3]monthly maximumreport only (mg/L)all yearD001
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLApr–OctD001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)Mar, Apr, May, Oct, Nov, DecD001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)Jan, Feb, Jun, Jul, Aug, SepD001
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)Mar, Apr, May, Oct, Nov, DecD001
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)Jan, Feb, Jun, Jul, Aug, SepD001
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)Mar, Apr, May, Oct, Nov, DecD001
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)Jan, Feb, Jun, Jul, Aug, SepD001
Solids, total dissolvedmonthly maximumreport only (mg/L)all yearD001
Mercury, dissolved [as Hg]monthly averagereport only (ng/L)all yearD001
Mercury, dissolved [as Hg]daily maximumreport only (ng/L)all yearD001
Mercury, total [as Hg]monthly average≤ 10 ng/Lall yearD001
Mercury, total [as Hg]daily maximum≤ 17 ng/Lall yearD001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall yearD001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/Lall yearD001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 389.5 kg/dall yearD001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 623.2 kg/dall yearD001
Precipitation, total defined period/inmonthly totalreport only (in)all yearS002
pHquarterly maximumreport only (SU)Mar, Jun, Sep, DecS002
Solids, total suspendedquarterly averagereport only (mg/L)Mar, Jun, Sep, DecS002
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS002
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS002
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS002
Phosphorus, total [as P]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearS002
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearS002
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearS002
Mercury, total [as Hg]monthly averagereport only (ng/L)all yearS002
BOD, carbonaceous [5 day, 20 C]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS002

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/MN0021466 · MCP: https://passage-data.com/mcp