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South Sangamon Water Commission

Water Supply, Rochester, Illinois. NPDES permit IL0079251, in force until Apr 30, 2027. Last 12 months: over a limit 4 times (last August 2026), 4 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due: About 25 days after each period: form 0 monthly (12 values)
Renewal application due: Nov 1, 2026 · 180 days before expiry; your permit may set another date
Last report on file: August 2026
Oct 2024 – Sep 2025: 4 values over a limit, 0 required values missing, 4 of 12 reports late

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

Period ending	Parameter	Reported	Limit	Over by
October 2025	Chloride, daily maximum	760 mg/L	≤ 500 mg/L	52%
November 2025	Chloride, daily maximum	960 mg/L	≤ 500 mg/L	92%
May 2026	Chloride, daily maximum	850 mg/L	≤ 500 mg/L	70%
August 2026	Manganese, total [as Mn], 30-day average	1.9 mg/L	≤ 1 mg/L	90%

Limits in force (12)

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
Iron, total [as Fe]	30-day average	≤ 2 mg/L	all year
Iron, total [as Fe]	daily maximum	≤ 4 mg/L	all year
Manganese, total [as Mn]	30-day average	≤ 1 mg/L	all year
Manganese, total [as Mn]	daily maximum	≤ 2 mg/L	all year
Chloride	daily maximum	≤ 500 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
Chlorine, total residual	daily maximum	≤ .05 mg/L	all year

How strict are these limits?

Manganese, total [as Mn], 30-day average 1 mg/L — stricter than 75% of 40 other minor industrial and other permits in Illinois; 25% have the same limit
Chloride, daily maximum 500 mg/L — stricter than 70% of 252 other minor industrial and other permits nationwide
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

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/IL0079251 · MCP: https://passage-data.com/mcp