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Tamarack city of

Sewage treatment plant, Tamarack, Minnesota. NPDES permit MN0064564 expired Aug 31, 2024; its limits still apply. Last 12 months: over a limit 35 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D002 form A1 monthly (22 values), outfall D002 form A2 monthly (1 value), outfall S003 form A1 monthly (11 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
19 values over a limit, 35 required values missing, 0 of 36 reports late

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

All 35 values over a limit
Period endingParameterReportedLimitOver by
October 2025pH, monthly maximum8.2≤ 8 SU—
November 2025BOD, carbonaceous [5 day, 20 C], monthly average32≤ 25 mg/L28%
November 2025BOD, carbonaceous [5 day, 20 C], maximum weekly average46≤ 40 mg/L15%
November 2025pH, monthly maximum8.5≤ 8 SU—
December 2025pH, monthly maximum9.2≤ 8 SU—
January 2026BOD, carb-5 day, 20 deg C, percent removal, monthly average minimum80≥ 85 %33%
January 2026BOD, carbonaceous [5 day, 20 C], monthly average1.07≤ .66 kg/d62%
January 2026BOD, carbonaceous [5 day, 20 C], monthly average41≤ 25 mg/L64%
January 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average1.29≤ 1.06 kg/d22%
January 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average49≤ 40 mg/L23%
January 2026Solids, suspended percent removal, monthly average minimum77≥ 85 %53%
February 2026BOD, carbonaceous [5 day, 20 C], monthly average30≤ 25 mg/L20%
February 2026Solids, suspended percent removal, monthly average minimum20≥ 85 %433%
February 2026Solids, total suspended, monthly average35≤ 30 mg/L17%
February 2026pH, monthly maximum9.2≤ 8 SU—
March 2026BOD, carb-5 day, 20 deg C, percent removal, monthly average minimum80≥ 85 %33%
March 2026BOD, carbonaceous [5 day, 20 C], monthly average.89≤ .66 kg/d35%
March 2026BOD, carbonaceous [5 day, 20 C], monthly average29≤ 25 mg/L16%
March 2026Solids, suspended percent removal, monthly average minimum7.8≥ 85 %515%
March 2026Solids, total suspended, monthly average1.1≤ .79 kg/d39%
March 2026Solids, total suspended, monthly average36≤ 30 mg/L20%
April 2026BOD, carb-5 day, 20 deg C, percent removal, monthly average minimum84≥ 85 %7%
April 2026BOD, carbonaceous [5 day, 20 C], monthly average.86≤ .66 kg/d30%
April 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average1.14≤ 1.06 kg/d8%
April 2026Solids, suspended percent removal, monthly average minimum52≥ 85 %220%
July 2026BOD, carbonaceous [5 day, 20 C], monthly average27≤ 25 mg/L8%
July 2026Coliform, fecal MPN + membrane ftl 44.5 C, monthly geometric mean1816≤ 200 #/100mL808%
August 2026Coliform, fecal MPN + membrane ftl 44.5 C, monthly geometric mean1506≤ 200 #/100mL653%
August 2026Solids, suspended percent removal, monthly average minimum70≥ 85 %100%
September 2026BOD, carb-5 day, 20 deg C, percent removal, monthly average minimum83≥ 85 %13%
September 2026BOD, carbonaceous [5 day, 20 C], monthly average.67≤ .66 kg/d2%
September 2026BOD, carbonaceous [5 day, 20 C], monthly average44≤ 25 mg/L76%
September 2026BOD, carbonaceous [5 day, 20 C], maximum weekly average48≤ 40 mg/L20%
September 2026Coliform, fecal MPN + membrane ftl 44.5 C, monthly geometric mean2329≤ 200 #/100mL1065%
September 2026Phosphorus, total [as P], annual total37.39≤ 34 kg/yr10%

Limits in force (34)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]monthly minimumreport only (mg/L)all yearD002
pHmonthly minimum≥ 5.5 SUall yearD002
pHmonthly maximum≤ 8 SUall yearD002
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD002
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall yearD002
Solids, total suspendedmonthly average≤ .79 kg/dall yearD002
Solids, total suspendedmaximum weekly average≤ 1.19 kg/dall yearD002
Nitrogen, total [as N]monthly averagereport only (mg/L)Mar, SepD002
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)Mar, SepD002
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)Mar, SepD002
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≤ 34 kg/yrall yearD002
Coliform, fecal MPN + membrane ftl 44.5 Cmonthly geometric mean≤ 200 #/100mLApr–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
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≤ .66 kg/dall yearD002
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 1.06 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)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
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/MN0064564 · MCP: https://passage-data.com/mcp