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Stark Materials, Inc

Heavy Construction, Downs, Illinois. NPDES permit IL0078824 expired Apr 30, 2020; its limits still apply. Last 12 months: no values over a limit, 14 required values missing, 3 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due: About 15 days after each period: form 0 monthly (7 values)
Last report on file: June 2026
Oct 2024 – Sep 2025: 0 values over a limit, 0 required values missing, 4 of 12 reports late

Limits in force (7)

Parameter	Statistic	Limit	Months
pH	monthly minimum	≥ 6 SU	all year
pH	monthly maximum	≤ 9 SU	all year
Solids, total suspended	30-day average	≤ 15 mg/L	all year
Solids, total suspended	daily maximum	≤ 30 mg/L	all year
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year
Offensive Conditions	value	report only (N=0;Y=1)	all year

How strict are these limits?

Solids, total suspended, 30-day average 15 mg/L — stricter than 37% of 259 other minor industrial and other permits in Illinois; 48% have the same limit
Solids, total suspended, daily maximum 30 mg/L — stricter than 20% of 508 other minor industrial and other permits in Illinois; 24% have the same limit

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

Same industry: the 3 Heavy Construction permits in Illinois.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IL0078824 · MCP: https://passage-data.com/mcp