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Isanti Estates LLC

Sewerage Systems, Isanti, Minnesota. NPDES permit MN0054518 expired Apr 30, 2026; its limits still apply. Last 12 months: over a limit 5 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D008 form A1 monthly (26 values), outfall D008 form A2 monthly (1 value), outfall S009 form A1 monthly (11 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
5 values over a limit, 0 required values missing, 0 of 36 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
February 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average52≤ 40 mg/L30%
June 2026Coliform, fecal MPN + membrane ftl 44.5 C, monthly geometric mean211≤ 200 #/100mL6%
July 2026Coliform, fecal MPN + membrane ftl 44.5 C, monthly geometric mean476≤ 200 #/100mL138%
July 2026Nitrogen, ammonia total [as N], monthly average1.3≤ 1 mg/L30%
August 2026Coliform, fecal MPN + membrane ftl 44.5 C, monthly geometric mean345≤ 200 #/100mL73%

Limits in force (44)

ParameterStatisticLimitMonthsOutfall
Specific conductancemonthly maximumreport only (umho/cm)all yearD008
Oxygen, dissolved [DO]monthly minimumreport only (mg/L)all yearD008
pHmonthly minimum≥ 6 SUall yearD008
pHmonthly maximum≤ 9 SUall yearD008
Bicarbonate ion- [as HCO3]monthly maximumreport only (mg/L)all yearD008
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD008
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall yearD008
Solids, total suspendedmonthly average≤ 2.3 kg/dall yearD008
Solids, total suspendedmaximum weekly average≤ 3.4 kg/dall yearD008
Nitrogen, total [as N]monthly averagereport only (mg/L)Mar, SepD008
Nitrogen, ammonia total [as N]monthly average≤ 2.4 mg/LOct, NovD008
Nitrogen, ammonia total [as N]monthly average≤ 1.4 mg/LApr, MayD008
Nitrogen, ammonia total [as N]monthly average≤ 3 mg/LJan, Feb, Mar, DecD008
Nitrogen, ammonia total [as N]monthly average≤ 1 mg/LJun–SepD008
Nitrogen, ammonia total [as N]monthly average≤ .18 kg/dOct, NovD008
Nitrogen, ammonia total [as N]monthly average≤ .11 kg/dApr, MayD008
Nitrogen, ammonia total [as N]monthly average≤ .23 kg/dJan, Feb, Mar, DecD008
Nitrogen, ammonia total [as N]monthly average≤ .08 kg/dJun–SepD008
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)Mar, SepD008
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)Mar, SepD008
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearD008
Phosphorus, total [as P]annual total≤ 97 kg/yrall yearD008
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLApr–OctD008
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD008
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD008
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD008
Solids, total dissolvedmonthly maximumreport only (mg/L)all yearD008
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall yearD008
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/Lall yearD008
BOD, carbonaceous [5 day, 20 C]monthly average≤ 1.9 kg/dall yearD008
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 3 kg/dall yearD008
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all yearD008
Solids, suspended percent removalmonthly average minimum≥ 85 %all yearD008
Precipitation, total defined period/inmonthly totalreport only (in)all yearS009
pHmonthly minimumreport only (SU)all yearS009
pHmonthly maximumreport only (SU)all yearS009
Solids, total suspendedmonthly averagereport only (mg/L)all yearS009
Solids, total suspendedmonthly maximumreport only (mg/L)all yearS009
Nitrogen, total [as N]monthly averagereport only (mg/L)Mar, SepS009
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)Mar, SepS009
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)Mar, SepS009
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearS009
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearS009
BOD, carbonaceous [5 day, 20 C]monthly maximumreport only (mg/L)all yearS009

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/MN0054518 · MCP: https://passage-data.com/mcp