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City of Davison

Water Supply, Davison, Michigan. NPDES permit MI0057427, in force until Oct 1, 2028. Last 12 months: over a limit 8 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 21 days after each period: form A monthly (21 values)
Renewal application due
Apr 4, 2028 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
19 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 2025Toxicity, choice of species, monthly average2.1≤ 1.5 tox chronic40%
November 2025Toxicity [acute], Ceriodaphnia dubia, daily maximum1.2≤ 1 tox acute20%
November 2025Toxicity, choice of species, monthly average2.1≤ 1.5 tox chronic40%
December 2025Toxicity, choice of species, monthly average2.1≤ 1.5 tox chronic40%
April 2026Solids, total dissolved, daily maximum2000≤ 1700 mg/L18%
April 2026Toxicity, choice of species, monthly average2.13≤ 1.5 tox chronic42%
May 2026Solids, total dissolved, monthly average1540≤ 1500 mg/L3%
September 2026Toxicity, choice of species, monthly average2.13≤ 1.5 tox chronic42%

Limits in force (21)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 3 mg/Lall 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
Chloride [as Cl]daily maximumreport only (mg/L)all year
Sulfate, total [as SO4]daily maximumreport only (mg/L)all year
Toxicity, choice of speciesmonthly average≤ 1.5 tox chronicall year
Toxicity, choice of speciesdaily maximumreport only (tox chronic)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 dissolvedmonthly average≤ 1500 mg/Lall year
Solids, total dissolveddaily maximum≤ 1700 mg/Lall year
Solids, total dissolvedmonthly average≤ 3100 lb/dall year
Solids, total dissolveddaily maximum≤ 3500 lb/dall year
Outfall observation,visual, y/n responsevaluereport only (N=0;Y=1)all year
TU Static 24 Hr Acute Pimephales promelasdaily maximum≤ 1 tox acuteall year
Static 48 Hr Chronic Pimphales Promelasmonthly average≤ 1.5 tox chronicall year
Static 48 Hr Chronic Pimphales Promelasdaily maximumreport only (tox chronic)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.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MI0057427 · MCP: https://passage-data.com/mcp