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Des Moines Water Works

Water Supply, Des Moines, Iowa. NPDES permit IA0052975 expired Apr 30, 2024; its limits still apply. 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 (11 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 (11)

Parameter	Statistic	Limit	Months
pH	daily minimum	≥ 6.5 SU	all year
pH	daily maximum	≤ 9 SU	all year
Nitrogen, nitrate total [as N]	daily maximum	≤ 9.5 mg/L	all year
Cadmium, total [as Cd]	30-day average	≤ .00045 mg/L	all year
Cadmium, total [as Cd]	daily maximum	≤ .0043 mg/L	all year
Cadmium, total [as Cd]	30-day average	≤ .0019 lb/d	all year
Cadmium, total [as Cd]	daily maximum	≤ .018 lb/d	all year
Chlorine, total residual	30-day average	≤ .011 mg/L	all year
Chlorine, total residual	daily maximum	≤ .019 mg/L	all year
Chlorine, total residual	30-day average	≤ .046 lb/d	all year
Chlorine, total residual	daily maximum	≤ .079 lb/d	all year

How strict are these limits?

Nitrogen, nitrate total [as N], daily maximum 9.5 mg/L — stricter than 87% of 104 other minor industrial and other permits nationwide; 8% have the same limit
Cadmium, total [as Cd], daily maximum .0043 mg/L — stricter than 79% of 107 other minor industrial and other permits nationwide
Chlorine, total residual, 30-day average .011 mg/L — stricter than 76% of 106 other minor industrial and other permits in Iowa; 16% 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/IA0052975 · MCP: https://passage-data.com/mcp