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Decatur, City of

Water Supply, Maroa, Illinois. NPDES permit IL0069736, in force until Dec 31, 2030. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due: About 25 days after each period: form 0 monthly (9 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 (9)

Parameter	Statistic	Limit	Months
pH	monthly minimum	≥ 6.5 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
Iron, total [as Fe]	30-day average	≤ 2 mg/L	all year
Iron, total [as Fe]	daily maximum	≤ 4 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
Flow, total	monthly total	report only (Mgal/mo)	all year

How strict are these limits?

Iron, total [as Fe], 30-day average 2 mg/L — stricter than 45% of 121 other minor industrial and other permits in Illinois; 54% have the same limit
Iron, total [as Fe], daily maximum 4 mg/L — stricter than 44% of 124 other minor industrial and other permits in Illinois; 52% have the same limit
pH, monthly minimum at least 6.5 SU — stricter than 38% of 286 other minor industrial and other permits in Illinois; 61% have the same limit

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

Same industry: the 30 Water Supply 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/IL0069736 · MCP: https://passage-data.com/mcp