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Interstate Power & Light Company

Electric Services, Ottumwa, Iowa. NPDES permit IA0053720, in force until Mar 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 (10 values)
Last report on file: September 2026

Limits in force (10)

Parameter	Statistic	Limit	Months
pH	daily minimum	≥ 6 SU	all year
pH	daily maximum	≤ 9 SU	all year
Sulfate, total [as SO4]	30-day average	≤ 1514 mg/L	all year
Sulfate, total [as SO4]	daily maximum	≤ 1514 mg/L	all year
Sulfate, total [as SO4]	30-day average	≤ 1060 lb/d	all year
Sulfate, total [as SO4]	daily maximum	≤ 1060 lb/d	all year
Iron, total [as Fe]	30-day average	≤ 3.7 mg/L	all year
Iron, total [as Fe]	daily maximum	≤ 3.7 mg/L	all year
Iron, total [as Fe]	30-day average	≤ 2.59 lb/d	all year
Iron, total [as Fe]	daily maximum	≤ 2.59 lb/d	all year

How strict are these limits?

Sulfate, total [as SO4], daily maximum 1514 mg/L — stricter than 52% of 25 other minor industrial and other permits in Iowa; 44% have the same limit
Sulfate, total [as SO4], 30-day average 1514 mg/L — stricter than 44% of 25 other minor industrial and other permits in Iowa; 52% have the same limit
Iron, total [as Fe], 30-day average 3.7 mg/L — stricter than 11% of 62 other minor industrial and other permits in Iowa

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

Same industry: the 14 Electric Services permits in Iowa.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IA0053720 · MCP: https://passage-data.com/mcp