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Green Oak Charter Township

Water Supply, South Lyon, Michigan. NPDES permit MI0058238, in force until Oct 1, 2027. Last 12 months: no values over a limit, 20 required values missing, 6 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 21 days after each period: form A monthly (20 values)
Renewal application due
Apr 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 40 required values missing, 3 of 12 reports late

Limits in force (20)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimumreport only (mg/L)all year
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendeddaily maximum≤ 50 mg/Lall year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Chloride [as Cl]daily maximumreport only (ug/L)all year
Arsenic, total [as As]daily maximumreport only (ug/L)all year
Iron, total [as Fe]monthly average≤ 5 mg/Lall year
Iron, total [as Fe]daily maximumreport only (mg/L)all 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≤ 38 ug/Lall year
Chlorine, total residualinstantaneous maximum= 300 ug/Lall year
Chlorine, total residualdaily maximum≤ 200 ug/Lall year
Flow, totalweekly totalreport only (Mgal)all year
Solids, total dissolveddaily maximumreport only (mg/L)all year
Chlorination durationdaily maximumreport only (min/d)all year
Chlorination durationdaily maximum= 160 min/dall year
Outfall observation,visual, y/n responsevaluereport only (N=0;Y=1)all year

How strict are these limits?

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

Same industry: the 6 Water Supply permits in Michigan.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MI0058238 · MCP: https://passage-data.com/mcp