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St Marys Cement U.S. LLC

Cement, Hydraulic, Detroit, Michigan. NPDES permit MI0004243, in force until Oct 1, 2028. Last 12 months: over a limit 5 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 21 days after each period: outfall 001 form A monthly (7 values), outfall 002 form A monthly (7 values), outfall INT form 1 monthly (2 values)
Renewal application due
Apr 4, 2028 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
7 values over a limit, 0 required values missing, 0 of 36 reports late

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

Period endingOutfallParameterReportedLimit
December 2025001pH, daily maximum9.5≤ 9 SU
December 2025002pH, daily maximum9.3≤ 9 SU
February 2026002pH, daily maximum9.17≤ 9 SU
April 2026001pH, daily maximum11.4≤ 9 SU
June 2026001pH, daily maximum9.99≤ 9 SU

Limits in force (16)

ParameterStatisticLimitMonthsOutfall
pHdaily minimum≥ 6.5 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendeddaily maximum≤ 50 mg/Lall year001
Solids, total suspendeddaily maximumreport only (lb/d)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Outfall observation,visual, y/n responsevaluereport only (N=0;Y=1)all year001
pHdaily minimum≥ 6.5 SUall year002
pHdaily maximum≤ 9 SUall year002
Solids, total suspendeddaily maximum≤ 50 mg/Lall year002
Solids, total suspendeddaily maximumreport only (lb/d)all year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Outfall observation,visual, y/n responsevaluereport only (N=0;Y=1)all year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all yearINT
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all yearINT

How strict are these limits?

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

Same industry: the 7 Stone, Clay, Glass and Concrete Products 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/MI0004243 · MCP: https://passage-data.com/mcp