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Hawkins, Inc.

Industrial Inorganic Chemicals, Camanche, Iowa. NPDES permit IA0068101 expired May 31, 2026; its limits still apply. Last 12 months: no values over a limit, 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due: About 15 days after each period: form A monthly (10 values)
Last report on file: September 2026
Oct 2024 – Sep 2025: 0 values over a limit, 0 required values missing, 3 of 12 reports late

Limits in force (10)

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	≤ 390.8 lb/d	all year
Solids, total suspended	daily maximum	≤ 568.2 lb/d	all year
Chlorine, total residual	30-day average	≤ .067 mg/L	all year
Chlorine, total residual	daily maximum	≤ .067 mg/L	all year
Chlorine, total residual	30-day average	≤ .83 lb/d	all year
Chlorine, total residual	daily maximum	≤ .83 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
Chlorine, total residual, daily maximum .067 mg/L — stricter than 27% of 107 other minor industrial and other permits in Iowa

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

Same industry: the 57 Chemicals and Allied Products permits in Iowa.

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Your permit document is the final word. As JSON: /api/v1/permits/IA0068101 · MCP: https://passage-data.com/mcp