NORTHWEST NATURAL

NPDES permit OR0044687 · Minor NON-POTW · administratively continued, expires 2018-08-31 · 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.

This permit expired on 2018-08-31 and is administratively continued: 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

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

Last period with anything received: 2026-07-31.

Reporting

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

Limits in force (20)

OutfallParameterStatisticLimitMonths
001pHDAILY MN >= 6.5 SU all year
001pHDAILY MX <= 8.5 SU all year
001Cyanide, total [as CN]MO AVG <= 510 ug/L all year
001Cyanide, total [as CN]DAILY MX <= 1000 ug/L all year
001Iron, total recoverableMO AVG <= 820 ug/L all year
001Iron, total recoverableDAILY MX <= 1600 ug/L all year
001Lead, total recoverableMO AVG <= 5 ug/L all year
001Lead, total recoverableDAILY MX <= 7.6 ug/L all year
001Copper, total recoverableMO AVG <= 15 ug/L all year
001Copper, total recoverableDAILY MX <= 30 ug/L all year
001Benzo[a]pyreneMO AVG <= 1 ug/L all year
001Benzo[a]pyreneDAILY MX <= 1 ug/L all year
001Indeno[1,2,3-cd]pyreneMO AVG <= 1 ug/L all year
001Indeno[1,2,3-cd]pyreneDAILY MX <= 1 ug/L all year
001Benzo[a]anthraceneMO AVG <= 1 ug/L all year
001Benzo[a]anthraceneDAILY MX <= 1 ug/L all year
001Dibenz[a,h]anthraceneMO AVG <= 1 ug/L all year
001Dibenz[a,h]anthraceneDAILY MX <= 1 ug/L all year
001Mercury, total recoverableMO AVG <= .01 ug/L all year
001Mercury, total recoverableDAILY MX <= .02 ug/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