Hennepin County Energy Center

NPDES permit MN0057509 · Minor NON-POTW · expired, expires 2026-04-30 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

This permit expired on 2026-04-30 and is expired: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

EPA's record, 2025-09-01 to 2026-08-31

1values over a limit
0required values missing, on 0 form(s)
0of 11 forms filed late

Last period with anything received: 2026-07-31. Most often over: Chlorine, total residual (1).

Reporting

Reports are due about 21 days after each monitoring period ends (the most common figure among MN permits in EPA's filings — check your permit).

Limits in force (11)

OutfallParameterStatisticLimitMonths
D001Temperature, water deg. fahrenheitDAILY MX <= 95 deg F all year
D001pHMO MIN >= 6 SU all year
D001pHMO MAX <= 9 SU all year
D001Nitrogen, total [as N]MO AVG report only all year
D001Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
D001Nitrite + Nitrate total [as N]MO AVG report only all year
D001Phosphorus, total [as P]MO AVG report only all year
D001Flow, in conduit or thru treatment plantMO AVG report only all year
D001Flow, in conduit or thru treatment plantMO MAX report only all year
D001Flow, in conduit or thru treatment plantMO TOTAL report only all year
D001Chlorine, total residualDAILY MX <= .038 mg/L all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states