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City of Ralston

Water Supply, Ralston, Iowa. NPDES permit IA0082392, in force until Apr 30, 2028. 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 (3 values)
Renewal application due: Nov 2, 2027 · 180 days before expiry; your permit may set another date
Last report on file: August 2026
Oct 2024 – Sep 2025: 0 values over a limit, 0 required values missing, 0 of 12 reports late

Limits in force (3)

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

New limits from May 1, 2027

Parameter	New limit	New or tighter	Median, last 12 months	× new limit
Chlorine, total residual, 30-day average	0.00015 lb/d	new	—	—
Chlorine, total residual, 30-day average	0.011 mg/L	new	—	—
Chlorine, total residual, daily maximum	0.019 mg/L	new	—	—
Chlorine, total residual, daily maximum	0.00025 lb/d	new	—	—
Iron, total [as Fe], 30-day average	1 mg/L	new	—	—
Iron, total [as Fe], 30-day average	0.013 lb/d	new	—	—
Iron, total [as Fe], daily maximum	1 mg/L	new	—	—
Iron, total [as Fe], daily maximum	0.013 lb/d	new	—	—

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
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

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/IA0082392 · MCP: https://passage-data.com/mcp