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Guardian Industries LLC

Flat Glass, Carleton, Michigan. NPDES permit MI0037001, in force until Oct 1, 2027. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 21 days after each period: form A monthly (28 values), form B monthly (6 values), form C monthly (6 values), form D monthly (7 values), form E monthly (7 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
5 values over a limit, 0 required values missing, 0 of 60 reports late

Limits in force (54)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year
Oxygen, dissolved [DO]daily minimum≥ 5 mg/Lall year
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 20 mg/Lall year
Solids, total suspendedmonthly average≤ 20 mg/Lall year
Solids, total suspendedmonthly average≤ 20 mg/Lall year
Solids, total suspendeddaily maximum≤ 30 mg/Lall year
Solids, total suspendeddaily maximum≤ 30 mg/Lall year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Solids, total suspendeddaily maximum≤ 30 mg/Lall year
Solids, total suspendedmonthly averagereport only (lb/d)all year
Solids, total suspendedmonthly averagereport only (lb/d)all year
Solids, total suspendedmonthly average≤ 58 lb/dall year
Solids, total suspendeddaily maximumreport only (lb/d)all year
Solids, total suspendeddaily maximumreport only (lb/d)all year
Solids, total suspendeddaily maximum≤ 1.2 lb/dall year
Solids, total suspendeddaily maximum≤ 1.6 lb/dall year
Solids, total suspendeddaily maximum≤ 87 lb/dall year
Oil & Greasedaily maximumreport only (mg/L)all year
Oil & Greasedaily maximumreport only (mg/L)all year
Oil & Greasedaily maximum≤ .84 lb/dall year
Oil & Greasedaily maximum≤ 1.1 lb/dall year
Phosphorus, total [as P]monthly average≤ 1 mg/Lall year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]monthly average≤ 2.9 lb/dall year
Phosphorus, total [as P]daily maximumreport only (lb/d)all year
Chloride [as Cl]daily maximumreport only (ug/L)all year
Sulfate, total [as SO4]daily maximumreport only (ug/L)all year
Silver, total [as Ag]daily maximumreport only (ug/L)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)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
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport 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 residualdaily maximum≤ 38 ug/Lall year
Chlorine, total residualdaily maximum≤ 38 ug/Lall year
Production divided by days operated mo.monthly totalreport only (ton/d)all year
Solids, total dissolvedmonthly average≤ 500 mg/Lall year
Solids, total dissolveddaily maximum≤ 750 mg/Lall year
Solids, total dissolvedmonthly average≤ 1500 lb/dall year
Solids, total dissolveddaily maximum≤ 2200 lb/dall year
Mercury, total [as Hg]monthly averagereport only (ng/L)all year
Mercury, total [as Hg]daily maximumreport only (ng/L)all year
Mercury, total [as Hg]monthly averagereport only (lb/d)all year
Mercury, total [as Hg]daily maximumreport only (lb/d)all 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 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/MI0037001 · MCP: https://passage-data.com/mcp