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City of Iowa City

Water Supply, Iowa City, Iowa. NPDES permit IA0076082, in force until Jan 31, 2029. Last 12 months: over a limit 4 times (last March 2026), 2 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due: About 15 days after each period: form A monthly (4 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
December 2025	pH, daily maximum	11.58	≤ 11 SU
January 2026	pH, daily maximum	11.57	≤ 11 SU
February 2026	pH, daily maximum	11.44	≤ 11 SU
March 2026	pH, daily maximum	11.21	≤ 11 SU

Limits in force (4)

Parameter	Statistic	Limit	Months
pH	daily minimum	≥ 6.3 SU	all year
pH	daily maximum	≤ 11 SU	all year
Solids, total suspended	30-day average	≤ 30 mg/L	all year
Solids, total suspended	daily maximum	≤ 45 mg/L	all year

How strict are these limits?

pH, daily minimum at least 6.3 SU — stricter than 54% of 423 other minor industrial and other permits in Iowa; 2% have the same limit
Solids, total suspended, 30-day average 30 mg/L — stricter than 40% of 289 other minor industrial and other permits in Iowa; 56% have the same limit
Solids, total suspended, daily maximum 45 mg/L — stricter than 14% of 114 other minor industrial and other permits in Iowa; 77% have the same limit

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

Same industry: the 48 Water Supply 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/IA0076082 · MCP: https://passage-data.com/mcp