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Tofte Wastewater Treatment Association Inc

Sewerage Systems, Tofte, Minnesota. NPDES permit MN0054593, in force until Feb 28, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D002 form A1 monthly (25 values), outfall D002 form A2 monthly (1 value), outfall S003 form A1 monthly (13 values), outfall S003 form A2 monthly (1 value)
Last report on file
August 2026
Oct 2024 – Sep 2025
6 values over a limit, 0 required values missing, 0 of 28 reports late

Limits in force (40)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly minimumreport only (mg/L)all yearD002
pHmonthly minimum≥ 6 SUall yearD002
pHmonthly maximum≤ 9 SUall yearD002
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD002
Solids, total suspendedmonthly maximumreport only (mg/L)May, SepD002
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall yearD002
Solids, total suspendedmonthly average≤ 2.7 kg/dall yearD002
Solids, total suspendedmaximum weekly average≤ 4.1 kg/dall yearD002
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, SepD002
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, SepD002
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, SepD002
Phosphorus, total [as P]monthly average≤ 1 mg/Lall yearD002
Phosphorus, total [as P]monthly average≤ .1 kg/dall yearD002
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLall yearD002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD002
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD002
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD002
Mercury, dissolved [as Hg]monthly maximumreport only (ng/L)May, SepD002
Mercury, total [as Hg]monthly average≤ 1.8 ng/LMay, SepD002
Mercury, total [as Hg]daily maximum≤ 2.9 ng/LMay, SepD002
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall yearD002
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/Lall yearD002
BOD, carbonaceous [5 day, 20 C]monthly average≤ 2.3 kg/dall yearD002
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 3.6 kg/dall yearD002
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all yearD002
Solids, suspended percent removalmonthly average minimum≥ 85 %all yearD002
Precipitation, total defined period/inmonthly totalreport only (in)all yearS003
pHmonthly minimumreport only (SU)all yearS003
pHmonthly maximumreport only (SU)all yearS003
Solids, total suspendedmonthly averagereport only (mg/L)May, SepS003
Solids, total suspendedmonthly averagereport only (mg/L)all yearS003
Solids, total suspendedmonthly maximumreport only (mg/L)all yearS003
Nitrogen, total [as N]monthly averagereport only (mg/L)Mar, SepS003
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)Mar, SepS003
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)Mar, SepS003
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearS003
Mercury, dissolved [as Hg]monthly averagereport only (ng/L)May, SepS003
Mercury, total [as Hg]monthly averagereport only (ng/L)May, SepS003
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearS003
BOD, carbonaceous [5 day, 20 C]monthly maximumreport only (mg/L)all yearS003

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/MN0054593 · MCP: https://passage-data.com/mcp