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

Northern Natural Gas Company

Natural Gas Transmission, Ogden, Iowa. NPDES permit IA0046957, in force until Jan 31, 2030. Last 12 months: over a limit once (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due: About 15 days after each period: form A monthly (5 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

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period ending	Parameter	Reported	Limit	Over by
July 2026	E. coli, geometric mean	160.6979	≤ 126 #/100mL	28%

Limits in force (5)

Parameter	Statistic	Limit	Months
pH	daily minimum	≥ 6.5 SU	all year
pH	daily maximum	≤ 9 SU	all year
Oil & Grease	30-day average	≤ 10 mg/L	all year
Oil & Grease	daily maximum	≤ 15 mg/L	all year
E. coli	geometric mean	≤ 126 #/100mL	Mar–Nov

How strict are these limits?

pH, daily minimum at least 6.5 SU — stricter than 60% of 423 other minor industrial and other permits in Iowa; 39% have the same limit
E. coli, geometric mean 126 #/100mL — stricter than 50% of 88 other minor industrial and other permits in Iowa; 50% have the same limit
Oil & Grease, daily maximum 15 mg/L — stricter than 17% of 41 other minor industrial and other permits in Iowa; 76% have the same limit

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/IA0046957 · MCP: https://passage-data.com/mcp