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Hennepin County Energy Center

Steam And Air-Conditioning Supply, Minneapolis, Minnesota. NPDES permit MN0057509 expired Apr 30, 2026; its limits still apply. Last 12 months: over a limit once (last June 2026), 1 required value missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 47 days after each period: 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 12 reports late

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

Period endingParameterReportedLimitOver by
June 2026Chlorine, total residual, daily maximum.04≤ .038 mg/L5%

Limits in force (11)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheitdaily maximum≤ 95 deg Fall year
pHmonthly minimum≥ 6 SUall year
pHmonthly maximum≤ 9 SUall year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly totalreport only (Mgal/mo)all year
Chlorine, total residualdaily maximum≤ .038 mg/Lall year

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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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MN0057509 · MCP: https://passage-data.com/mcp