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Comfrey city of

Sewage treatment plant, Comfrey, Minnesota. NPDES permit MN0021687, in force until Jul 31, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D004 form A1 monthly (26 values), outfall D004 form A2 monthly (2 values), outfall S005 form A1 monthly (14 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 36 reports late

Limits in force (44)

ParameterStatisticLimitMonthsOutfall
Specific conductancequarterly maximumreport only (umho/cm)Mar, Jun, Sep, DecD004
Oxygen, dissolved [DO]monthly minimumreport only (mg/L)all yearD004
pHmonthly minimum≥ 6 SUall yearD004
pHmonthly maximum≤ 9 SUall yearD004
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD004
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall yearD004
Solids, total suspendedmonthly average≤ 8.5 kg/dall yearD004
Solids, total suspendedmaximum weekly average≤ 12.8 kg/dall yearD004
Nitrogen, total [as N]monthly averagereport only (mg/L)Mar, SepD004
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)Mar, SepD004
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)Mar, SepD004
Phosphorus, total [as P]monthly average≤ 1 mg/LJan, Feb, Mar, Apr, May, Oct, Nov, DecD004
Phosphorus, total [as P]monthly average≤ 1 mg/LJun–SepD004
Phosphorus, total [as P]monthly averagereport only (kg/d)Jan, Feb, Mar, Apr, May, Oct, Nov, DecD004
Phosphorus, total [as P]monthly average≤ 1.1 kg/dJun–SepD004
Phosphorus, total [as P]annual total≤ 104 kg/yrall yearD004
Chloride [as Cl]quarterly maximumreport only (mg/L)Mar, Jun, Sep, DecD004
Sulfate, total [as SO4]quarterly maximumreport only (mg/L)Mar, Jun, Sep, DecD004
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLMay–OctD004
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD004
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD004
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD004
Chlorine, total residualdaily maximum≤ .038 mg/LMay–OctD004
Solids, total dissolvedquarterly maximumreport only (mg/L)Mar, Jun, Sep, DecD004
BOD, carbonaceous [5 day, 20 C]monthly average≤ 15 mg/Lall yearD004
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 25 mg/Lall yearD004
BOD, carbonaceous [5 day, 20 C]monthly average≤ 4.3 kg/dall yearD004
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 7.1 kg/dall yearD004
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all yearD004
Solids, suspended percent removalmonthly average minimum≥ 85 %all yearD004
Precipitation, total defined period/inmonthly totalreport only (in)all yearS005
pHmonthly minimumreport only (SU)all yearS005
pHmonthly maximumreport only (SU)all yearS005
Solids, total suspendedmonthly averagereport only (mg/L)all yearS005
Solids, total suspendedmonthly maximumreport only (mg/L)all yearS005
Nitrogen, total [as N]monthly averagereport only (mg/L)Mar, SepS005
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)Mar, SepS005
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)Mar, SepS005
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearS005
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearS005
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearS005
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearS005
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearS005
BOD, carbonaceous [5 day, 20 C]monthly maximumreport only (mg/L)all yearS005

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/MN0021687 · MCP: https://passage-data.com/mcp