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Dassel city of

Sewage treatment plant, Dassel, Minnesota. NPDES permit MN0054127, in force until Jan 31, 2031. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D021 form A1 monthly (22 values), outfall D021 form A2 monthly (3 values), outfall D021 form A3 monthly (1 value), outfall S024 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 48 reports late

Limits in force (40)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly minimumreport only (mg/L)all yearD021
pHmonthly minimum≥ 6 SUall yearD021
pHmonthly maximum≤ 9 SUall yearD021
Solids, total suspendedmonthly average≤ 45 mg/Lall yearD021
Solids, total suspendedmaximum weekly average≤ 65 mg/Lall yearD021
Solids, total suspendedmonthly average≤ 208 kg/dall yearD021
Solids, total suspendedmaximum weekly average≤ 300 kg/dall yearD021
Nitrogen, total [as N]monthly averagereport only (mg/L)all yearD021
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all yearD021
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all yearD021
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all yearD021
Phosphorus, total [as P]monthly average≤ 1 mg/Lall yearD021
Phosphorus, total [as P]monthly average≤ 5 kg/dall yearD021
Phosphorus, total [as P]year-to-date total≤ 260 kg/yrall yearD021
Sulfate, total [as SO4]monthly maximumreport only (mg/L)all yearD021
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLApr–OctD021
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)Jan–AugD021
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)Sep–DecD021
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)Jan–AugD021
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)Sep–DecD021
Flow, in conduit or thru treatment plantyear-to-date totalreport only (Mgal/mo)all yearD021
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)Jan–AugD021
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)Sep–DecD021
Chlorine, total residualdaily maximum≤ .038 mg/LApr–OctD021
Solids, total dissolvedmonthly averagereport only (mg/L)all yearD021
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall yearD021
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/Lall yearD021
BOD, carbonaceous [5 day, 20 C]monthly average≤ 115 kg/dall yearD021
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 185 kg/dall yearD021
Precipitation, total defined period/inmonthly totalreport only (in)all yearS024
pHquarterly maximumreport only (SU)Mar, Jun, Sep, DecS024
Solids, total suspendedquarterly averagereport only (mg/L)Mar, Jun, Sep, DecS024
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS024
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS024
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS024
Phosphorus, total [as P]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS024
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearS024
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearS024
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearS024
BOD, carbonaceous [5 day, 20 C]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS024

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/MN0054127 · MCP: https://passage-data.com/mcp