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Maynard city of

Sewage treatment plant, Maynard, Minnesota. NPDES permit MN0056588 expired Apr 30, 2026; 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 D001 form A1 monthly (24 values), outfall D001 form A2 monthly (2 values), outfall S004 form A1 monthly (11 values), outfall W003 form A1 monthly (2 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 48 reports late

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

Period endingParameterReportedLimitOver by
March 2026BOD, carb-5 day, 20 deg C, percent removal, monthly average minimum81.73≥ 85 %22%

Limits in force (43)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly minimumreport only (mg/L)all yearD001
pHmonthly minimum≥ 6 SUall yearD001
pHmonthly maximum≤ 9 SUall yearD001
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD001
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall yearD001
Solids, total suspendedmonthly average≤ 17.4 kg/dall yearD001
Solids, total suspendedmaximum weekly average≤ 26 kg/dall yearD001
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all yearD001
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD001
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD001
Phosphorus, total [as P]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, May, Oct, Nov, DecD001
Phosphorus, total [as P]monthly averagereport only (mg/L)Jun–SepD001
Phosphorus, total [as P]monthly averagereport only (kg/d)Jan, Feb, Mar, Apr, May, Oct, Nov, DecD001
Phosphorus, total [as P]monthly average≤ 2.1 kg/dJun–SepD001
Phosphorus, total [as P]annual total≤ 740 kg/yrall yearD001
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLApr–OctD001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD001
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD001
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD001
Chlorine, total residualdaily maximum≤ .038 mg/Lall yearD001
Solids, total dissolvedmonthly averagereport only (mg/L)Mar, SepD001
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≤ 14.5 kg/dall yearD001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 23.1 kg/dall yearD001
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all yearD001
Solids, suspended percent removalmonthly average minimum≥ 85 %all yearD001
Precipitation, total defined period/inmonthly totalreport only (in)all yearS004
pHmonthly minimumreport only (SU)all yearS004
pHmonthly maximumreport only (SU)all yearS004
Solids, total suspendedmonthly averagereport only (mg/L)all yearS004
Solids, total suspendedmonthly maximumreport only (mg/L)all yearS004
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS004
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS004
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS004
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearS004
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearS004
BOD, carbonaceous [5 day, 20 C]monthly maximumreport only (mg/L)all yearS004
Temperature, water deg. centigrademonthly maximumreport only (deg C)Apr–NovW003
Temperature, water deg. centigrademonthly maximumreport only (deg C)Jan, Feb, Mar, DecW003
pHmonthly maximumreport only (SU)Apr–NovW003
pHmonthly maximumreport only (SU)Jan, Feb, Mar, DecW003

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/MN0056588 · MCP: https://passage-data.com/mcp