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Isanti city of

Sewage treatment plant, Isanti, Minnesota. NPDES permit MN0023795 expired Apr 30, 2025; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D011 form A1 monthly (25 values), outfall D011 form A2 monthly (2 values), outfall S014 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 (41)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly minimumreport only (mg/L)all yearD011
pHmonthly minimum≥ 6 SUall yearD011
pHmonthly maximum≤ 9 SUall yearD011
Solids, total suspendedmonthly average≤ 45 mg/Lall yearD011
Solids, total suspendedannual maximumreport only (mg/L)all yearD011
Solids, total suspendedmaximum weekly average≤ 65 mg/Lall yearD011
Solids, total suspendedmonthly average≤ 30.8 kg/dall yearD011
Solids, total suspendedmaximum weekly average≤ 46.2 kg/dall yearD011
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD011
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Mar, SepD011
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD011
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecD011
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearD011
Phosphorus, total [as P]annual total≤ 908 kg/yrall yearD011
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLApr–OctD011
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD011
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD011
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD011
Solids, total dissolvedmonthly averagereport only (mg/L)Mar, SepD011
Mercury, dissolved [as Hg]annual maximumreport only (ng/L)all yearD011
Mercury, total [as Hg]annual maximumreport only (ng/L)all yearD011
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall yearD011
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/Lall yearD011
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25.7 kg/dall yearD011
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 41.1 kg/dall yearD011
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all yearD011
Solids, suspended percent removalmonthly average minimum≥ 85 %all yearD011
Precipitation, total defined period/inmonthly totalreport only (in)all yearS014
pHmonthly minimumreport only (SU)all yearS014
pHmonthly maximumreport only (SU)all yearS014
Solids, total suspendedmonthly averagereport only (mg/L)all yearS014
Solids, total suspendedmonthly maximumreport only (mg/L)all yearS014
Nitrogen, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS014
Nitrogen, Kjeldahl, total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS014
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)Mar, Jun, Sep, DecS014
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearS014
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearS014
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearS014
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearS014
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearS014
BOD, carbonaceous [5 day, 20 C]monthly maximumreport only (mg/L)all yearS014

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/MN0023795 · MCP: https://passage-data.com/mcp