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Chisago Lakes Joint STC

Sewage treatment plant, major discharger, Chisago City, Minnesota. NPDES permit MN0055808, in force until Mar 31, 2030. Last 12 months: over a limit 2 times (last January 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D002 form A1 monthly (37 values), outfall D002 form A2 monthly (1 value), outfall D002 form A3 monthly (2 values), outfall S006 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 32 reports late

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

Period endingParameterReportedLimitOver by
November 2025pH, monthly maximum12.7≤ 9 SU—
January 2026Chloride [as Cl], monthly average296≤ 286 mg/L3%

Limits in force (54)

ParameterStatisticLimitMonthsOutfall
Specific conductancemonthly maximumreport only (umho/cm)all yearD002
Oxygen, dissolved [DO]monthly minimum≥ 6 mg/Lall yearD002
pHmonthly minimum≥ 6 SUall yearD002
pHmonthly maximum≤ 9 SUall yearD002
Bicarbonate ion- [as HCO3]monthly maximumreport only (mg/L)all 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≤ 279 kg/dall yearD002
Solids, total suspendedmaximum weekly average≤ 418.5 kg/dall yearD002
Nitrogen, total [as N]monthly averagereport only (mg/L)all yearD002
Nitrogen, ammonia total [as N]monthly average≤ 2.7 mg/LJun–SepD002
Nitrogen, ammonia total [as N]monthly average≤ 25.8 mg/LJan, Feb, Mar, DecD002
Nitrogen, ammonia total [as N]monthly average≤ 10.7 mg/LOct, NovD002
Nitrogen, ammonia total [as N]monthly average≤ 10 mg/LApr, MayD002
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all yearD002
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all yearD002
Phosphorus, total [as P]12-month average≤ 1 mg/Lall yearD002
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearD002
Phosphorus, total [as P]monthly averagereport only (kg/d)all yearD002
Phosphorus, total [as P]annual total≤ 2039 kg/yrall yearD002
Calcium, total [as Ca]monthly maximumreport only (mg/L)all yearD002
Magnesium, total [as Mg]monthly maximumreport only (mg/L)all yearD002
Sodium, total [as Na]monthly maximumreport only (mg/L)all yearD002
Potassium, total [as K]monthly maximumreport only (mg/L)all yearD002
Chloride [as Cl]monthly average≤ 286 mg/Lall yearD002
Chloride [as Cl]daily maximumreport only (mg/L)all yearD002
Copper, total [as Cu]monthly maximumreport only (mg/L)all yearD002
Hardness, Ca Mg Calculated [mg/L as CaCO3]monthly maximumreport only (mg/L)all yearD002
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLMay–OctD002
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
Chlorine, total residualdaily maximum≤ .038 mg/LMay–OctD002
Solids, total dissolvedmonthly averagereport only (mg/L)all yearD002
Mercury, dissolved [as Hg]monthly maximumreport only (ng/L)May, SepD002
Mercury, total [as Hg]monthly maximumreport only (ng/L)May, 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≤ 119 kg/dall yearD002
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 191 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 yearS006
pHmonthly minimumreport only (SU)all yearS006
pHmonthly maximumreport only (SU)all yearS006
Solids, total suspendedmonthly averagereport only (mg/L)all yearS006
Solids, total suspendedmonthly maximumreport only (mg/L)all yearS006
Nitrogen, total [as N]monthly averagereport only (mg/L)all yearS006
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all yearS006
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all yearS006
Phosphorus, total [as P]monthly averagereport only (mg/L)all yearS006
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all yearS006
BOD, carbonaceous [5 day, 20 C]monthly maximumreport only (mg/L)all yearS006

How strict are these limits?

Cited limits by parameter: Minnesota's rules and the federal ones.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MN0055808 · MCP: https://passage-data.com/mcp