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City of Allegan

Water Supply, Allegan, Michigan. NPDES permit MI0058703 expired Oct 1, 2025; its limits still apply. Last 12 months: over a limit 4 times (last September 2026), 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 21 days after each period: form A monthly (17 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
6 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
December 2025TU Static 24 Hr Acute Daphnia magna, daily maximum1.4≤ 1 tox acute40%
May 2026TU Static 24 Hr Acute Daphnia magna, daily maximum1.65≤ 1 tox acute65%
June 2026TU Static 24 Hr Acute Daphnia magna, daily maximum1.26≤ 1 tox acute26%
September 2026TU Static 24 Hr Acute Daphnia magna, daily maximum1.26≤ 1 tox acute26%

Limits in force (17)

ParameterStatisticLimitMonths
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
Phosphorus, total [as P]daily maximumreport only (lb/d)all year
Chloride [as Cl]daily maximumreport only (mg/L)all year
Sulfate, total [as SO4]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
Toxicity [acute], Ceriodaphnia dubiadaily maximum≤ 1 tox acuteall year
Solids, total dissolveddaily maximumreport only (mg/L)all year
Outfall observation,visual, y/n responsevaluereport only (N=0;Y=1)all year
Toxic Units Static 24 Hr Acute Ceriodaphnia dubiadaily maximum≤ 1 tox acuteall year
TU Static 24 Hr Acute Daphnia magnadaily maximum≤ 1 tox acuteall year
TU Static 24 Hr Acute Pimephales promelasdaily maximum≤ 1 tox acuteall 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.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MI0058703 · MCP: https://passage-data.com/mcp