NORTHERN NATURAL GAS COMPANY

NPDES permit IA0046957 · Minor NON-POTW · effective, expires 2030-01-31 · 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.

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

1values over a limit

0required values missing, on 0 form(s)

0of 12 forms filed late

Last period with anything received: 2026-08-31. Most often over: E. coli (1).

Reporting

Reports are due about 15 days after each monitoring period ends (the most common figure among IA permits in EPA's filings — check your permit).

Outfall 001, form A (MONTHLY): every 1 month(s), 5 values

Limits in force (5)

Outfall	Parameter	Statistic	Limit	Months
001	pH	DAILY MN	>= 6.5 SU	all year
001	pH	DAILY MX	<= 9 SU	all year
001	Oil & Grease	30DA AVG	<= 10 mg/L	all year
001	Oil & Grease	DAILY MX	<= 15 mg/L	all year
001	E. coli	GEO MEAN	<= 126 #/100mL	Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov

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