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Chatfield city of

Sewage treatment plant, Chatfield, Minnesota. NPDES permit MN0021857, in force until Jan 31, 2030. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D007 form A1 monthly (25 values), 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 17 reports late

Limits in force (39)

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≤ 30 mg/Lall yearD007
Solids, total suspendedmonthly maximumreport only (mg/L)JulD007
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall yearD007
Solids, total suspendedmonthly average≤ 55 kg/dall yearD007
Solids, total suspendedmaximum weekly average≤ 82.9 kg/dall yearD007
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD007
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Mar, SepD007
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD007
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD007
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearD007
Phosphorus, total [as P]monthly averagereport only (kg/d)all yearD007
Sulfate, total [as SO4]quarterly maximumreport only (mg/L)Mar, Jun, Sep, DecD007
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLApr–OctD007
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD007
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD007
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD007
Solids, total dissolvedmonthly averagereport only (mg/L)Mar, SepD007
Mercury, dissolved [as Hg]monthly maximumreport only (ng/L)JulD007
Mercury, total [as Hg]monthly maximumreport only (ng/L)JulD007
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≤ 46 kg/dall yearD007
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 73.7 kg/dall yearD007
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all yearD007
Solids, suspended percent removalmonthly average minimum≥ 85 %all yearD007
Precipitation, total defined period/inmonthly totalreport only (in)all yearS008
pHmonthly minimumreport only (SU)all yearS008
pHmonthly maximumreport only (SU)all yearS008
Solids, total suspendedmonthly averagereport only (mg/L)all yearS008
Solids, total suspendedmonthly maximumreport only (mg/L)all yearS008
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS008
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS008
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS008
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearS008
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearS008
BOD, carbonaceous [5 day, 20 C]monthly maximumreport only (mg/L)all yearS008

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/MN0021857 · MCP: https://passage-data.com/mcp