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City of Charles City

Water Supply, Charles City, Iowa. NPDES permit IA0003182, in force until Jan 31, 2029. Last 12 months: over a limit once (last December 2025), 8 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due: About 15 days after each period: form A monthly (8 values)
Last report on file: August 2026
Oct 2024 – Sep 2025: 4 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
December 2025	Iron, total [as Fe], daily maximum	1.63	≤ 1.03 mg/L	58%

Limits in force (8)

Parameter	Statistic	Limit	Months
pH	daily minimum	≥ 6.5 SU	all year
pH	daily maximum	≤ 9 SU	all year
Solids, total suspended	30-day average	≤ 30 mg/L	all year
Solids, total suspended	daily maximum	≤ 45 mg/L	all year
Iron, total [as Fe]	30-day average	≤ 1.03 mg/L	all year
Iron, total [as Fe]	daily maximum	≤ 1.03 mg/L	all year
Iron, total [as Fe]	30-day average	≤ .914 lb/d	all year
Iron, total [as Fe]	daily maximum	≤ .914 lb/d	all year

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
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
Iron, total [as Fe], daily maximum 1.03 mg/L — stricter than 32% of 62 other minor industrial and other permits in Iowa

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/IA0003182 · MCP: https://passage-data.com/mcp