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Polar Semiconductor LLC

Semiconductors And Related Devices, Bloomington, Minnesota. NPDES permit MN0064661 expired Dec 31, 2021; its limits still apply. Last 12 months: over a limit once (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D001 form A1 monthly (22 values), outfall D003 form A1 monthly (3 values), outfall D004 form A1 monthly (22 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 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
September 2026Flow, in conduit or thru treatment plant, daily maximum.292≤ .213 MGD37%

Limits in force (47)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitmonthly maximum≤ 86 deg Fall yearD001
Specific conductancemonthly maximumreport only (umho/cm)all yearD001
pHmonthly minimum≥ 6 SUall yearD001
pHmonthly maximum≤ 9 SUall yearD001
Bicarbonate ion- [as HCO3]monthly maximumreport only (mg/L)all yearD001
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD001
Solids, total suspendeddaily maximum≤ 45 mg/Lall yearD001
Nitrogen, total [as N]monthly maximumreport only (mg/L)Mar, SepD001
Nitrogen, Kjeldahl, total [as N]monthly maximumreport only (mg/L)Mar, SepD001
Nitrite + Nitrate total [as N]monthly maximumreport only (mg/L)Mar, SepD001
Phosphorus, total [as P]monthly maximumreport only (mg/L)Mar, SepD001
Calcium, total [as Ca]monthly maximumreport only (mg/L)all yearD001
Magnesium, total [as Mg]monthly maximumreport only (mg/L)all yearD001
Sodium, total [as Na]monthly maximumreport only (mg/L)all yearD001
Potassium, total [as K]monthly maximumreport only (mg/L)all yearD001
Chloride [as Cl]monthly maximumreport only (mg/L)all yearD001
Sulfate, total [as SO4]monthly maximumreport only (mg/L)all yearD001
Hardness, Ca Mg Calculated [mg/L as CaCO3]monthly maximumreport only (mg/L)all yearD001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearD001
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD001
Solids, total dissolvedmonthly maximumreport only (mg/L)all yearD001
Solids, total suspendedmonthly maximumreport only (mg/L)all yearD003
Solids, total suspendeddaily maximum≤ 15.87 kg/dall yearD003
Flow, in conduit or thru treatment plantdaily maximum≤ .213 MGDall yearD003
Temperature, water deg. fahrenheitmonthly maximum≤ 86 deg Fall yearD004
Specific conductancemonthly maximumreport only (umho/cm)all yearD004
pHmonthly minimum≥ 6 SUall yearD004
pHmonthly maximum≤ 9 SUall yearD004
Bicarbonate ion- [as HCO3]monthly maximumreport only (mg/L)all yearD004
Solids, total suspendedmonthly average≤ 30 mg/Lall yearD004
Solids, total suspendeddaily maximum≤ 45 mg/Lall yearD004
Nitrogen, total [as N]monthly maximumreport only (mg/L)Mar, SepD004
Nitrogen, Kjeldahl, total [as N]monthly maximumreport only (mg/L)Mar, SepD004
Nitrite + Nitrate total [as N]monthly maximumreport only (mg/L)Mar, SepD004
Phosphorus, total [as P]monthly maximumreport only (mg/L)Mar, SepD004
Calcium, total [as Ca]monthly maximumreport only (mg/L)all yearD004
Magnesium, total [as Mg]monthly maximumreport only (mg/L)all yearD004
Sodium, total [as Na]monthly maximumreport only (mg/L)all yearD004
Potassium, total [as K]monthly maximumreport only (mg/L)all yearD004
Chloride [as Cl]monthly maximumreport only (mg/L)all yearD004
Sulfate, total [as SO4]monthly maximumreport only (mg/L)all yearD004
Hardness, Ca Mg Calculated [mg/L as CaCO3]monthly maximumreport only (mg/L)all yearD004
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD004
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearD004
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD004
Solids, total dissolvedmonthly maximumreport only (mg/L)all yearD004

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/MN0064661 · MCP: https://passage-data.com/mcp