NORTHERN NATURAL GAS

NPDES permit IA0004391 · Minor NON-POTW · effective, expires 2031-01-31 · 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

0values over a limit
0required values missing, on 0 form(s)
0of 12 forms filed late

Last period with anything received: 2026-08-31.

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).

Limits in force (71)

OutfallParameterStatisticLimitMonths
001Oxygen demand, chem. [high level] [COD]DAILY MX <= 105.8 mg/L all year
001Oxygen demand, chem. [high level] [COD]DAILY MX <= 79.7 lb/d all year
001pHDAILY MN >= 6.5 SU all year
001pHDAILY MX <= 9 SU all year
001Solids, total suspendedDAILY MX <= 80 mg/L all year
001Oil & Grease30DA AVG <= 10 mg/L all year
001Oil & GreaseDAILY MX <= 15 mg/L all year
001Nitrogen, ammonia total [as N]30DA AVG <= 1 mg/L Aug
001Nitrogen, ammonia total [as N]30DA AVG <= 3.4 mg/L Jan
001Nitrogen, ammonia total [as N]30DA AVG <= 1.1 mg/L Sep
001Nitrogen, ammonia total [as N]30DA AVG <= 1 mg/L Jul
001Nitrogen, ammonia total [as N]30DA AVG <= 1.6 mg/L Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 3.4 mg/L Mar
001Nitrogen, ammonia total [as N]30DA AVG <= 2.5 mg/L Dec
001Nitrogen, ammonia total [as N]30DA AVG <= 1.5 mg/L Apr
001Nitrogen, ammonia total [as N]30DA AVG <= 1.3 mg/L Jun
001Nitrogen, ammonia total [as N]30DA AVG <= 1.7 mg/L May
001Nitrogen, ammonia total [as N]30DA AVG <= 2.3 mg/L Nov
001Nitrogen, ammonia total [as N]30DA AVG <= 4 mg/L Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 2.7 mg/L Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 19.9 mg/L Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 2.7 mg/L Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 3.2 mg/L Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 2.7 mg/L Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 3.9 mg/L Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 3.9 mg/L Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 4.7 mg/L Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 3.2 mg/L Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 3.2 mg/L May
001Nitrogen, ammonia total [as N]DAILY MX <= 2.7 mg/L Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 8.4 mg/L Feb
001Nitrogen, ammonia total [as N]30DA AVG <= .7 lb/d Aug
001Nitrogen, ammonia total [as N]30DA AVG <= 2.6 lb/d Jan
001Nitrogen, ammonia total [as N]30DA AVG <= .8 lb/d Sep
001Nitrogen, ammonia total [as N]30DA AVG <= .8 lb/d Jul
001Nitrogen, ammonia total [as N]30DA AVG <= 1.2 lb/d Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 2.6 lb/d Mar
001Nitrogen, ammonia total [as N]30DA AVG <= 1.9 lb/d Dec
001Nitrogen, ammonia total [as N]30DA AVG <= 1.1 lb/d Apr
001Nitrogen, ammonia total [as N]30DA AVG <= 1 lb/d Jun
001Nitrogen, ammonia total [as N]30DA AVG <= 1.3 lb/d May
001Nitrogen, ammonia total [as N]30DA AVG <= 1.7 lb/d Nov
001Nitrogen, ammonia total [as N]30DA AVG <= 3 lb/d Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 2 lb/d Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 15 lb/d Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 2 lb/d Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 2.4 lb/d Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 2 lb/d Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 2.9 lb/d Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 2.9 lb/d Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 3.6 lb/d Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 2.4 lb/d Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 2.4 lb/d May
001Nitrogen, ammonia total [as N]DAILY MX <= 2 lb/d Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 6.3 lb/d Feb
001Copper, total [as Cu]30DA AVG <= .01687 mg/L all year
001Copper, total [as Cu]DAILY MX <= .0269 mg/L all year
001Copper, total [as Cu]30DA AVG <= .0127 lb/d all year
001Copper, total [as Cu]DAILY MX <= .02026 lb/d all year
001Iron, total [as Fe]30DA AVG <= 1 mg/L all year
001Iron, total [as Fe]DAILY MX <= 1 mg/L all year
001Iron, total [as Fe]30DA AVG <= .7531 lb/d all year
001Iron, total [as Fe]DAILY MX <= .7531 lb/d all year
001Lead, total [as Pb]30DA AVG <= .007693 mg/L all year
001Lead, total [as Pb]DAILY MX <= .1974 mg/L all year
001Lead, total [as Pb]30DA AVG <= .005793 lb/d all year
001Lead, total [as Pb]DAILY MX <= .1487 lb/d all year
001Aluminum, total [as Al]30DA AVG <= .087 mg/L all year
001Aluminum, total [as Al]DAILY MX <= .75 mg/L all year
001Aluminum, total [as Al]30DA AVG <= .06552 lb/d all year
001Aluminum, total [as Al]DAILY MX <= .5648 lb/d 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