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Cromwell city of

Sewage treatment plant, Cromwell, Minnesota. NPDES permit MN0051101 expired Feb 28, 2026; its limits still apply. Last 12 months: over a limit once (last May 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D007 form A1 monthly (21 values), outfall D007 form A2 monthly (1 value), outfall S008 form A1 monthly (11 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 36 reports late

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

Period endingParameterReportedLimit
May 2026pH, monthly maximum9.1≤ 9 SU

Limits in force (36)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly minimumreport only (mg/L)all yearD007
pHmonthly minimum≥ 6 SUall yearD007
pHmonthly maximum≤ 9 SUall yearD007
Solids, total suspendedmonthly average≤ 45 mg/Lall yearD007
Solids, total suspendedmaximum weekly average≤ 65 mg/Lall yearD007
Solids, total suspendedmonthly average≤ 101.3 kg/dall yearD007
Solids, total suspendedmaximum weekly average≤ 146.3 kg/dall yearD007
Nitrogen, total [as N]monthly averagereport only (mg/L)all yearD007
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all yearD007
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all yearD007
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]year-to-date total≤ 72 kg/yrall yearD007
Sulfate, total [as SO4]monthly averagereport only (mg/L)all yearD007
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLApr–OctD007
Flow, in conduit or thru treatment plantannual averagereport only (MGD)Jan, Feb, Jul, AugD007
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)Mar, Apr, May, Jun, Sep, Oct, Nov, DecD007
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)Jan, Feb, Jul, AugD007
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)Mar, Apr, May, Jun, Sep, Oct, Nov, DecD007
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)Jan, Feb, Jul, AugD007
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)Mar, Apr, May, Jun, Sep, Oct, Nov, DecD007
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≤ 56.2 kg/dall yearD007
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 90 kg/dall yearD007
Precipitation, total defined period/inmonthly totalreport only (in)all yearS008
pHquarterly maximumreport only (SU)Mar, Jun, Sep, DecS008
Solids, total suspendedquarterly averagereport only (mg/L)Mar, Jun, Sep, DecS008
Nitrogen, total [as N]monthly averagereport only (mg/L)Mar, SepS008
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)Mar, SepS008
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)Mar, SepS008
Phosphorus, total [as P]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS008
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
BOD, carbonaceous [5 day, 20 C]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS008

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/MN0051101 · MCP: https://passage-data.com/mcp