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Amerize Cement Inc.

Cement, Hydraulic, Mason City, Iowa. NPDES permit IA0071951, in force until May 31, 2027. Last 12 months: over a limit 3 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due: About 15 days after each period: form A monthly (6 values)
Renewal application due: Dec 2, 2026 · 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

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period ending	Parameter	Reported	Limit	Over by
July 2026	Solids, total suspended, 30-day average	32	≤ 30 mg/L	7%
July 2026	Solids, total suspended, daily maximum	222.1295	≤ 195.9 lb/d	13%
July 2026	Solids, total suspended, daily maximum	64	≤ 45 mg/L	42%

Limits in force (6)

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
Solids, total suspended	30-day average	≤ 130.6 lb/d	all year
Solids, total suspended	daily maximum	≤ 195.9 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
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 5 Stone, Clay, Glass and Concrete Products 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/IA0071951 · MCP: https://passage-data.com/mcp