Passage Data · Check a report · Use it from your AI

Northern Natural Gas

Natural Gas Transmission, Oakland, Iowa. NPDES permit IA0004391, in force until Jan 31, 2031. 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 (27 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 (71)

ParameterStatisticLimitMonths
Oxygen demand, chem. [high level] [COD]daily maximum≤ 105.8 mg/Lall year
Oxygen demand, chem. [high level] [COD]daily maximum≤ 79.7 lb/dall year
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendeddaily maximum≤ 80 mg/Lall year
Oil & Grease30-day average≤ 10 mg/Lall year
Oil & Greasedaily maximum≤ 15 mg/Lall year
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LAug
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LJan
Nitrogen, ammonia total [as N]30-day average≤ 1.1 mg/LSep
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 1.6 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 3.4 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 2.5 mg/LDec
Nitrogen, ammonia total [as N]30-day average≤ 1.5 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 1.3 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 1.7 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 2.3 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 4 mg/LFeb
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LAug
Nitrogen, ammonia total [as N]daily maximum≤ 19.9 mg/LJan
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LSep
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 3.9 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 4.7 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 3.2 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 2.7 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 8.4 mg/LFeb
Nitrogen, ammonia total [as N]30-day average≤ .7 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 2.6 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ .8 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ .8 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 1.2 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 2.6 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 1.9 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 1.1 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 1 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 1.3 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 1.7 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 3 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 2 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 15 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 2 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 2.4 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 2 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 2.9 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 2.9 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 3.6 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 2.4 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 2.4 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 2 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 6.3 lb/dFeb
Copper, total [as Cu]30-day average≤ .01687 mg/Lall year
Copper, total [as Cu]daily maximum≤ .0269 mg/Lall year
Copper, total [as Cu]30-day average≤ .0127 lb/dall year
Copper, total [as Cu]daily maximum≤ .02026 lb/dall year
Iron, total [as Fe]30-day average≤ 1 mg/Lall year
Iron, total [as Fe]daily maximum≤ 1 mg/Lall year
Iron, total [as Fe]30-day average≤ .7531 lb/dall year
Iron, total [as Fe]daily maximum≤ .7531 lb/dall year
Lead, total [as Pb]30-day average≤ .007693 mg/Lall year
Lead, total [as Pb]daily maximum≤ .1974 mg/Lall year
Lead, total [as Pb]30-day average≤ .005793 lb/dall year
Lead, total [as Pb]daily maximum≤ .1487 lb/dall year
Aluminum, total [as Al]30-day average≤ .087 mg/Lall year
Aluminum, total [as Al]daily maximum≤ .75 mg/Lall year
Aluminum, total [as Al]30-day average≤ .06552 lb/dall year
Aluminum, total [as Al]daily maximum≤ .5648 lb/dall year

How strict are these limits?

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

Same industry: the 4 Natural Gas Transmission permits in Iowa.

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

· Save this facility as a site · Superfund sites nearby · Your permits on one board

On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IA0004391 · MCP: https://passage-data.com/mcp