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Duluth city of

Steam And Air-Conditioning Supply, Duluth, Minnesota. NPDES permit MN0055719, in force until Feb 28, 2031. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: outfall D001 form A1 monthly (4 values), outfall D002 form A1 monthly (1 value), outfall D003 form A1 monthly (4 values), outfall D004 form A1 monthly (2 values), outfall D005 form A1 monthly (2 values), outfall D006 form A1 monthly (4 values), and 4 more forms
Last report on file
September 2026

Limits in force (37)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitdaily maximum≤ 75 deg Fall yearD001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD001
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD001
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD001
Temperature, water deg. fahrenheitdaily maximum≤ 75 deg Fall yearD002
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
Temperature, water deg. fahrenheitdaily maximum≤ 86 deg Fall yearD003
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD003
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD003
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD003
Temperature, water deg. fahrenheitdaily maximum≤ 75 deg Fall yearD004
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD004
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD004
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD004
Temperature, water deg. fahrenheitdaily maximum≤ 80 deg Fall yearD005
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD005
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD005
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD005
Temperature, water deg. fahrenheitdaily maximum≤ 80 deg Fall yearD006
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD006
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD006
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD006
Temperature, water deg. fahrenheitdaily maximum≤ 80 deg Fall yearD007
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD007
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD007
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD007
Temperature, water deg. fahrenheitdaily maximum≤ 80 deg Fall yearD008
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
Temperature, water deg. fahrenheitdaily maximum≤ 80 deg Fall yearD009
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearD009
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all yearD009
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all yearD009
Solids, total suspendedannual averagereport only (mg/L)all yearD010

How strict are these limits?

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

Same industry: the 3 Steam And Air-Conditioning Supply permits in Minnesota.

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Your permit document is the final word. As JSON: /api/v1/permits/MN0055719 · MCP: https://passage-data.com/mcp