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Zumbrota city of

Sewage treatment plant, major discharger, Zumbrota, Minnesota. NPDES permit MN0025330, in force until Dec 31, 2028. Last 12 months: over a limit 14 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D019 form A1 monthly (29 values), outfall D019 form A2 monthly (9 values), outfall S020 form A1 monthly (11 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
4 values over a limit, 0 required values missing, 0 of 36 reports late

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

All 14 values over a limit
Period endingParameterReportedLimitOver by
October 2025Coliform, fecal MPN + membrane ftl 44.5 C, monthly geometric mean334≤ 200 #/100mL67%
May 2026Solids, suspended percent removal, monthly average minimum84≥ 85 %7%
May 2026Solids, total suspended, monthly average42≤ 30 mg/L40%
May 2026Solids, total suspended, maximum weekly average46≤ 45 mg/L2%
June 2026Solids, suspended percent removal, monthly average minimum76≥ 85 %60%
June 2026Solids, total suspended, monthly average139≤ 126 kg/d10%
June 2026Solids, total suspended, monthly average62≤ 30 mg/L107%
June 2026Solids, total suspended, maximum weekly average101≤ 45 mg/L124%
June 2026Solids, total suspended, maximum weekly average219≤ 189 kg/d16%
July 2026Solids, total suspended, monthly average41≤ 30 mg/L37%
July 2026Solids, total suspended, maximum weekly average245≤ 189 kg/d30%
July 2026Solids, total suspended, maximum weekly average94≤ 45 mg/L109%
August 2026Solids, total suspended, monthly average34≤ 30 mg/L13%
August 2026Solids, total suspended, maximum weekly average61≤ 45 mg/L36%

Limits in force (49)

ParameterStatisticLimitMonthsOutfall
Specific conductancemonthly maximumreport only (umho/cm)all yearD019
Oxygen, dissolved [DO]monthly minimumreport only (mg/L)all yearD019
pHmonthly minimum≥ 6 SUall yearD019
pHmonthly maximum≤ 9 SUall yearD019
Bicarbonate ion- [as HCO3]monthly maximumreport only (mg/L)all yearD019
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD019
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall yearD019
Solids, total suspendedmonthly maximumreport only (mg/L)May, SepD019
Solids, total suspendedmonthly average≤ 126 kg/dall yearD019
Solids, total suspendedmaximum weekly average≤ 189 kg/dall yearD019
Nitrogen, total [as N]monthly averagereport only (mg/L)all yearD019
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all yearD019
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all yearD019
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all yearD019
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearD019
Phosphorus, total [as P]monthly averagereport only (kg/d)all yearD019
Calcium, total [as Ca]monthly maximumreport only (mg/L)all yearD019
Magnesium, total [as Mg]monthly maximumreport only (mg/L)all yearD019
Sodium, total [as Na]monthly maximumreport only (mg/L)all yearD019
Potassium, total [as K]monthly maximumreport only (mg/L)all yearD019
Chloride [as Cl]monthly maximumreport only (mg/L)all yearD019
Sulfate, total [as SO4]monthly maximumreport only (mg/L)all yearD019
Lead, total [as Pb]quarterly maximumreport only (ug/L)Mar, Jun, Sep, DecD019
Hardness, Ca Mg Calculated [mg/L as CaCO3]monthly maximumreport only (mg/L)all yearD019
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLApr–OctD019
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD019
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD019
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD019
Chlorine, total residualdaily maximum≤ .038 mg/LApr–OctD019
Solids, total dissolvedmonthly maximumreport only (mg/L)all yearD019
Mercury, dissolved [as Hg]monthly maximumreport only (ng/L)May, SepD019
Mercury, total [as Hg]monthly maximumreport only (ng/L)May, SepD019
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall yearD019
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/Lall yearD019
BOD, carbonaceous [5 day, 20 C]monthly average≤ 105 kg/dall yearD019
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 168 kg/dall yearD019
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all yearD019
Solids, suspended percent removalmonthly average minimum≥ 85 %all yearD019
Precipitation, total defined period/inmonthly totalreport only (in)all yearS020
pHmonthly minimumreport only (SU)all yearS020
pHmonthly maximumreport only (SU)all yearS020
Solids, total suspendedmonthly averagereport only (mg/L)all yearS020
Solids, total suspendedmonthly maximumreport only (mg/L)all yearS020
Nitrogen, total [as N]monthly averagereport only (mg/L)all yearS020
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all yearS020
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all yearS020
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearS020
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearS020
BOD, carbonaceous [5 day, 20 C]monthly maximumreport only (mg/L)all yearS020

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

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Your permit document is the final word. As JSON: /api/v1/permits/MN0025330 · MCP: https://passage-data.com/mcp