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Dawson, Village of

Water Supply, Dawson, Illinois. NPDES permit IL0053431 expired Apr 30, 2025; its limits still apply. Last 12 months: over a limit 6 times (last September 2026), 20 required values missing, 4 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: form 0 monthly (10 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
15 values over a limit, 0 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
October 2025Chlorine, total residual, daily maximum.2 mg/L≤ .05 mg/L300%
October 2025pH, monthly maximum9.4 SU≤ 9 SU—
February 2026Chloride [as Cl], daily maximum7700 mg/L≤ 7200 mg/L7%
July 2026pH, monthly maximum9.2 SU≤ 9 SU—
August 2026pH, monthly maximum9.4 SU≤ 9 SU—
September 2026Chloride [as Cl], daily maximum22000 mg/L≤ 7200 mg/L206%

Limits in force (10)

ParameterStatisticLimitMonths
pHmonthly minimum≥ 6 SUall year
pHmonthly maximum≤ 9 SUall year
Solids, total suspended30-day average≤ 15 mg/Lall year
Solids, total suspendeddaily maximum≤ 30 mg/Lall year
Chloride [as Cl]daily maximum≤ 7200 mg/Lall year
Iron, total [as Fe]30-day average≤ 2 mg/Lall year
Iron, total [as Fe]daily maximum≤ 4 mg/Lall year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualdaily maximum≤ .05 mg/Lall year

How strict are these limits?

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/IL0053431 · MCP: https://passage-data.com/mcp