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Northwest Natural

Gas Transmission And Distribution, Multnomah, Oregon. NPDES permit OR0044687 expired Aug 31, 2018; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (20 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

Limits in force (20)

ParameterStatisticLimitMonths
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 8.5 SUall year
Cyanide, total [as CN]monthly average≤ 510 ug/Lall year
Cyanide, total [as CN]daily maximum≤ 1000 ug/Lall year
Iron, total recoverablemonthly average≤ 820 ug/Lall year
Iron, total recoverabledaily maximum≤ 1600 ug/Lall year
Lead, total recoverablemonthly average≤ 5 ug/Lall year
Lead, total recoverabledaily maximum≤ 7.6 ug/Lall year
Copper, total recoverablemonthly average≤ 15 ug/Lall year
Copper, total recoverabledaily maximum≤ 30 ug/Lall year
Benzo[a]pyrenemonthly average≤ 1 ug/Lall year
Benzo[a]pyrenedaily maximum≤ 1 ug/Lall year
Indeno[1,2,3-cd]pyrenemonthly average≤ 1 ug/Lall year
Indeno[1,2,3-cd]pyrenedaily maximum≤ 1 ug/Lall year
Benzo[a]anthracenemonthly average≤ 1 ug/Lall year
Benzo[a]anthracenedaily maximum≤ 1 ug/Lall year
Dibenz[a,h]anthracenemonthly average≤ 1 ug/Lall year
Dibenz[a,h]anthracenedaily maximum≤ 1 ug/Lall year
Mercury, total recoverablemonthly average≤ .01 ug/Lall year
Mercury, total recoverabledaily maximum≤ .02 ug/Lall year

How strict are these limits?

Cited limits by parameter: Oregon's rules and the federal ones.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/OR0044687 · MCP: https://passage-data.com/mcp