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St. Charles County PWSD #2

Water Supply, major discharger, Defiance, Missouri. NPDES permit MO0087718, in force until Jul 31, 2030. Last 12 months: over a limit once (last July 2026), 3 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form M monthly (15 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 2 reports late

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

Period endingParameterReportedLimitOver by
July 2026Solids, total suspended, daily maximum13150≤ 12268 mg/L7%

Limits in force (15)

ParameterStatisticLimitMonths
pHminimum≥ 6 SUall year
pHmaximum≤ 10.5 SUall year
Solids, total suspendeddaily maximum≤ 12268 mg/Lall year
Solids, total suspendedmonthly average≤ 10131 mg/Lall year
Solids, total suspendeddaily maximumreport only (lb/d)all year
Solids, total suspendedmonthly averagereport only (lb/d)all year
Solids, settleabledaily maximumreport only (mL/L)all year
Solids, settleablemonthly averagereport only (mL/L)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Chlorine, total residualdaily maximumreport only (ug/L)all year
Chlorine, total residualmonthly averagereport only (ug/L)all year
Water treatment additivesdaily maximumreport only (lb/d)all year
Water treatment additivesmonthly averagereport only (lb/d)all year
Outfall observation,visual, y/n responsedaily maximumreport only (pass=0;fail=1)all year

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

Same industry: the 18 Water Supply permits in Missouri.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MO0087718 · MCP: https://passage-data.com/mcp