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Winsted city of

Sewage treatment plant, Winsted, Minnesota. NPDES permit MN0021571 expired Mar 31, 2021; its limits still apply. Last 12 months: over a limit 2 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D035 form A1 monthly (36 values), outfall D035 form A2 monthly (3 values), outfall S034 form A1 monthly (14 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
5 values over a limit, 0 required values missing, 0 of 36 reports late

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

Period endingParameterReportedLimitOver by
May 2026Oxygen, dissolved [DO], monthly minimum5.6≥ 6 mg/L7%
August 2026Phosphorus, total [as P], monthly average.8≤ .63 mg/L27%

Limits in force (61)

ParameterStatisticLimitMonthsOutfall
Specific conductancemonthly maximumreport only (umho/cm)all yearD035
Oxygen, dissolved [DO]monthly minimum≥ 6 mg/Lall yearD035
pHmonthly minimum≥ 6 SUall yearD035
pHmonthly maximum≤ 9 SUall yearD035
Bicarbonate ion- [as HCO3]monthly maximumreport only (mg/L)all yearD035
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD035
Solids, total suspendedmonthly maximumreport only (mg/L)Apr, SepD035
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall yearD035
Solids, total suspendedmonthly average≤ 93.1 kg/dall yearD035
Solids, total suspendedmaximum weekly average≤ 139.7 kg/dall yearD035
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD035
Nitrogen, ammonia total [as N]monthly average≤ 1.4 mg/LApr, MayD035
Nitrogen, ammonia total [as N]monthly average≤ 1 mg/LJun–SepD035
Nitrogen, ammonia total [as N]monthly average≤ 7.7 mg/LJan, Feb, Mar, DecD035
Nitrogen, ammonia total [as N]monthly average≤ 2.4 mg/LOct, NovD035
Nitrogen, ammonia total [as N]monthly average≤ 4.3 kg/dApr, MayD035
Nitrogen, ammonia total [as N]monthly average≤ 3.1 kg/dJun–SepD035
Nitrogen, ammonia total [as N]monthly average≤ 23.9 kg/dJan, Feb, Mar, DecD035
Nitrogen, ammonia total [as N]monthly average≤ 7.4 kg/dOct, NovD035
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD035
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD035
Phosphorus, total [as P]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, May, Oct, Nov, DecD035
Phosphorus, total [as P]monthly average≤ .63 mg/LJun–SepD035
Phosphorus, total [as P]12-month average≤ 1 mg/Lall yearD035
Phosphorus, total [as P]monthly averagereport only (kg/d)Jan, Feb, Mar, Apr, May, Oct, Nov, DecD035
Phosphorus, total [as P]monthly averagereport only (kg/d)Jun–SepD035
Phosphorus, total [as P]annual total≤ 1133 kg/yrall yearD035
Calcium, total [as Ca]monthly maximumreport only (mg/L)all yearD035
Magnesium, total [as Mg]monthly maximumreport only (mg/L)all yearD035
Sodium, total [as Na]monthly maximumreport only (mg/L)all yearD035
Potassium, total [as K]monthly maximumreport only (mg/L)all yearD035
Chloride [as Cl]monthly maximumreport only (mg/L)all yearD035
Sulfate, total [as SO4]monthly maximumreport only (mg/L)all yearD035
Hardness, Ca Mg Calculated [mg/L as CaCO3]monthly maximumreport only (mg/L)all yearD035
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLApr–OctD035
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD035
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD035
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD035
Solids, total dissolvedmonthly maximumreport only (mg/L)all yearD035
Mercury, dissolved [as Hg]monthly maximumreport only (ng/L)Apr, SepD035
Mercury, total [as Hg]monthly maximumreport only (ng/L)Apr, SepD035
BOD, carbonaceous [5 day, 20 C]monthly average≤ 15 mg/Lall yearD035
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 25 mg/Lall yearD035
BOD, carbonaceous [5 day, 20 C]monthly average≤ 46.5 kg/dall yearD035
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 69.8 kg/dall yearD035
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all yearD035
Solids, suspended percent removalmonthly average minimum≥ 85 %all yearD035
Precipitation, total defined period/inmonthly totalreport only (in)all yearS034
pHmonthly minimumreport only (SU)all yearS034
pHmonthly maximumreport only (SU)all yearS034
Solids, total suspendedmonthly averagereport only (mg/L)all yearS034
Solids, total suspendedmonthly maximumreport only (mg/L)all yearS034
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS034
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS034
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS034
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearS034
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearS034
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearS034
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearS034
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearS034
BOD, carbonaceous [5 day, 20 C]monthly maximumreport only (mg/L)all yearS034

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/MN0021571 · MCP: https://passage-data.com/mcp