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Blast Furnaces And Steel Mills, major discharger, Dearborn, Michigan. NPDES permit MI0043524 expired Oct 1, 2016; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) | all year | 001 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 001 |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | May–Sep | 001 |
| pH | daily minimum | ≥ 6.5 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 001 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 001 |
| Solids, total suspended | monthly average | report only (lb/d) | all year | 001 |
| Solids, total suspended | daily maximum | report only (lb/d) | all year | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 001 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 001 |
| Solids, total suspended | monthly average | report only (lb/d) | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 12100 lb/d | all year | 001 |
| Solids, total suspended | monthly average | ≤ 4700 lb/d | all year | 001 |
| Solids, total suspended | daily maximum | report only (lb/d) | all year | 001 |
| Oil & Grease | monthly average | report only (mg/L) | all year | 001 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | 001 |
| Oil & Grease | monthly average | report only (lb/d) | all year | 001 |
| Oil & Grease | daily maximum | ≤ 3300 lb/d | all year | 001 |
| Cadmium, total [as Cd] | daily maximum | report only (ug/L) | all year | 001 |
| Cadmium, total [as Cd] | daily maximum | report only (lb/d) | all year | 001 |
| Copper, total [as Cu] | monthly average | report only (ug/L) | all year | 001 |
| Copper, total [as Cu] | daily maximum | report only (ug/L) | all year | 001 |
| Copper, total [as Cu] | monthly average | report only (lb/d) | all year | 001 |
| Copper, total [as Cu] | daily maximum | report only (lb/d) | all year | 001 |
| Lead, total [as Pb] | monthly average | ≤ 10 ug/L | all year | 001 |
| Lead, total [as Pb] | daily maximum | report only (ug/L) | all year | 001 |
| Lead, total [as Pb] | monthly average | ≤ 5.7 lb/d | all year | 001 |
| Lead, total [as Pb] | daily maximum | ≤ 17 lb/d | all year | 001 |
| Silver, total [as Ag] | monthly average | report only (ug/L) | all year | 001 |
| Silver, total [as Ag] | daily maximum | report only (ug/L) | all year | 001 |
| Silver, total [as Ag] | monthly average | report only (lb/d) | all year | 001 |
| Silver, total [as Ag] | daily maximum | report only (lb/d) | all year | 001 |
| Zinc, total [as Zn] | monthly average | report only (ug/L) | all year | 001 |
| Zinc, total [as Zn] | daily maximum | report only (ug/L) | all year | 001 |
| Zinc, total [as Zn] | monthly average | report only (lb/d) | all year | 001 |
| Zinc, total [as Zn] | daily maximum | report only (lb/d) | all year | 001 |
| Zinc, total [as Zn] | monthly average | report only (ug/L) | all year | 001 |
| Zinc, total [as Zn] | daily maximum | report only (ug/L) | all year | 001 |
| Zinc, total [as Zn] | monthly average | report only (lb/d) | all year | 001 |
| Zinc, total [as Zn] | daily maximum | report only (lb/d) | all year | 001 |
| Zinc, total [as Zn] | monthly average | report only (ug/L) | all year | 001 |
| Zinc, total [as Zn] | daily minimum | report only (ug/L) | all year | 001 |
| Zinc, total [as Zn] | monthly average | ≤ 9 lb/d | all year | 001 |
| Zinc, total [as Zn] | daily maximum | ≤ 25 lb/d | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Chlorine, total residual | daily maximum | report only (ug/L) | all year | 001 |
| Mercury, total [as Hg] | monthly average | report only (ng/L) | Jan, Apr, Jul, Oct | 001 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | Jan, Apr, Jul, Oct | 001 |
| Mercury, total [as Hg] | monthly average | report only (lb/d) | Jan, Apr, Jul, Oct | 001 |
| Mercury, total [as Hg] | daily maximum | report only (lb/d) | Jan, Apr, Jul, Oct | 001 |
| Mercury, total [as Hg] | 12-month average | ≤ 4 ng/L | Jan, Apr, Jul, Oct | 001 |
| Mercury, total [as Hg] | 12-month average | ≤ .0034 lb/d | Jan, Apr, Jul, Oct | 001 |
| Outfall observation,visual, y/n response | value | report only (N=0;Y=1) | all year | 001 |
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) | all year | 002 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 002 |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | May–Sep | 002 |
| pH | daily minimum | ≥ 6.5 SU | all year | 002 |
| pH | daily maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 002 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 002 |
| Solids, total suspended | monthly average | report only (lb/d) | all year | 002 |
| Solids, total suspended | monthly average | ≤ 700 lb/d | all year | 002 |
| Solids, total suspended | monthly average | ≤ 47 lb/d | all year | 002 |
| Solids, total suspended | daily maximum | report only (lb/d) | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 1850 lb/d | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 130 lb/d | all year | 002 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | 002 |
| Oil & Grease | monthly average | ≤ 160 lb/d | all year | 002 |
| Oil & Grease | daily maximum | ≤ 490 lb/d | all year | 002 |
| Oil & Grease | daily maximum | report only (lb/d) | all year | 002 |
| Lead, total [as Pb] | monthly average | ≤ .6 lb/d | all year | 002 |
| Lead, total [as Pb] | monthly average | ≤ .62 lb/d | all year | 002 |
| Lead, total [as Pb] | daily maximum | ≤ 1.7 lb/d | all year | 002 |
| Lead, total [as Pb] | daily maximum | ≤ 1.9 lb/d | all year | 002 |
| Silver, total [as Ag] | monthly average | ≤ 1.1 ug/L | all year | 002 |
| Silver, total [as Ag] | daily maximum | report only (ug/L) | all year | 002 |
| Silver, total [as Ag] | monthly average | ≤ .13 lb/d | all year | 002 |
| Silver, total [as Ag] | daily maximum | report only (lb/d) | all year | 002 |
| Zinc, total [as Zn] | monthly average | ≤ .84 lb/d | all year | 002 |
| Zinc, total [as Zn] | monthly average | ≤ .93 lb/d | all year | 002 |
| Zinc, total [as Zn] | daily maximum | ≤ 2.5 lb/d | all year | 002 |
| Zinc, total [as Zn] | daily maximum | ≤ 2.8 lb/d | all year | 002 |
| Cyanide [A] | monthly average | report only (ug/L) | all year | 002 |
| Cyanide [A] | daily maximum | report only (ug/L) | all year | 002 |
| Cyanide [A] | monthly average | report only (lb/d) | all year | 002 |
| Cyanide [A] | daily maximum | report only (lb/d) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Chlorine, total residual | daily maximum | report only (ug/L) | all year | 002 |
| Production divided by days operated mo. | monthly average | report only (ton/d) | all year | 002 |
| Production divided by days operated mo. | daily maximum | report only (ton/d) | all year | 002 |
| Mercury, total [as Hg] | monthly average | report only (ng/L) | Jan, Apr, Jul, Oct | 002 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | Jan, Apr, Jul, Oct | 002 |
| Mercury, total [as Hg] | monthly average | report only (lb/d) | Jan, Apr, Jul, Oct | 002 |
| Mercury, total [as Hg] | daily maximum | report only (lb/d) | Jan, Apr, Jul, Oct | 002 |
| Mercury, total [as Hg] | 12-month average | ≤ 4 ng/L | all year | 002 |
| Mercury, total [as Hg] | 12-month average | ≤ .00047 lb/d | all year | 002 |
| Outfall observation,visual, y/n response | value | report only (N=0;Y=1) | all year | 002 |
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) | all year | 004 |
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) | all year | 004 |
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) | all year | 004 |
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) | all year | 004 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 004 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 004 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 004 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 004 |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | May–Sep | 004 |
| pH | daily minimum | ≥ 6.5 SU | all year | 004 |
| pH | daily minimum | ≥ 6.5 SU | all year | 004 |
| pH | daily minimum | ≥ 6.5 SU | all year | 004 |
| pH | daily minimum | ≥ 6.5 SU | all year | 004 |
| pH | daily maximum | ≤ 9 SU | all year | 004 |
| pH | daily maximum | ≤ 9 SU | all year | 004 |
| pH | daily maximum | ≤ 9 SU | all year | 004 |
| pH | daily maximum | ≤ 9 SU | all year | 004 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 004 |
| Solids, total suspended | daily maximum | ≤ 70 mg/L | all year | 004 |
| Solids, total suspended | monthly average | ≤ 13 lb/d | all year | 004 |
| Solids, total suspended | monthly average | ≤ 370 lb/d | all year | 004 |
| Solids, total suspended | daily maximum | ≤ 29 lb/d | all year | 004 |
| Solids, total suspended | daily maximum | ≤ 1100 lb/d | all year | 004 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | 004 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | 004 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | 004 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 004 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 190 lb/d | all year | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 380 lb/d | all year | 004 |
| Cyanide, total [as CN] | monthly average | ≤ 13 lb/d | all year | 004 |
| Cyanide, total [as CN] | daily maximum | ≤ 25 lb/d | all year | 004 |
| Copper, total [as Cu] | daily maximum | report only (ug/L) | Jan, Apr, Jul, Oct | 004 |
| Copper, total [as Cu] | daily maximum | report only (lb/d) | Jan, Apr, Jul, Oct | 004 |
| Lead, total [as Pb] | monthly average | ≤ 1.3 lb/d | all year | 004 |
| Lead, total [as Pb] | daily maximum | ≤ 3.8 lb/d | all year | 004 |
| Thallium, total [as Tl] | monthly average | ≤ 4.4 ug/L | all year | 004 |
| Thallium, total [as Tl] | daily maximum | report only (ug/L) | all year | 004 |
| Thallium, total [as Tl] | monthly average | ≤ 13 lb/d | all year | 004 |
| Thallium, total [as Tl] | daily maximum | report only (lb/d) | all year | 004 |
| Zinc, total [as Zn] | monthly average | ≤ 1.9 lb/d | all year | 004 |
| Zinc, total [as Zn] | daily maximum | ≤ 5.7 lb/d | all year | 004 |
| Selenium, total [as Se] | monthly average | ≤ 5.7 ug/L | all year | 004 |
| Selenium, total [as Se] | daily maximum | report only (ug/L) | all year | 004 |
| Selenium, total [as Se] | monthly average | ≤ 17 lb/d | all year | 004 |
| Selenium, total [as Se] | daily maximum | report only (lb/d) | all year | 004 |
| Cyanide [A] | monthly average | report only (ug/L) | all year | 004 |
| Cyanide [A] | daily maximum | report only (ug/L) | all year | 004 |
| Cyanide [A] | daily maximum | report only (ug/L) | Jan, Apr, Jul, Oct | 004 |
| Cyanide [A] | daily maximum | report only (ug/L) | all year | 004 |
| Cyanide [A] | monthly average | report only (lb/d) | all year | 004 |
| Cyanide [A] | daily maximum | report only (lb/d) | all year | 004 |
| Cyanide [A] | daily maximum | report only (lb/d) | Jan, Apr, Jul, Oct | 004 |
| Cyanide [A] | daily maximum | report only (lb/d) | all year | 004 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 004 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 004 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 004 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 004 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 004 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 004 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 004 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 004 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 004 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 004 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 004 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 004 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 004 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 004 |
| Chlorine, total residual | daily maximum | report only (ug/L) | all year | 004 |
| Chlorine, total residual | daily maximum | report only (ug/L) | all year | 004 |
| Chlorine, total residual | daily maximum | report only (ug/L) | all year | 004 |
| Chlorine, total residual | daily maximum | report only (ug/L) | all year | 004 |
| Chlorine, total residual | daily maximum | ≤ 2.1 lb/d | all year | 004 |
| Production divided by days operated mo. | monthly average | report only (ton/d) | all year | 004 |
| Production divided by days operated mo. | daily maximum | report only (ton/d) | all year | 004 |
| Mercury, total [as Hg] | monthly average | report only (ng/L) | Jan, Apr, Jul, Oct | 004 |
| Mercury, total [as Hg] | monthly average | report only (ng/L) | Jan, Apr, Jul, Oct | 004 |
| Mercury, total [as Hg] | monthly average | report only (ng/L) | all year | 004 |
| Mercury, total [as Hg] | monthly average | report only (ng/L) | all year | 004 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | Jan, Apr, Jul, Oct | 004 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | Jan, Apr, Jul, Oct | 004 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | 004 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | 004 |
| Mercury, total [as Hg] | monthly average | report only (lb/d) | Jan, Apr, Jul, Oct | 004 |
| Mercury, total [as Hg] | monthly average | report only (lb/d) | Jan, Apr, Jul, Oct | 004 |
| Mercury, total [as Hg] | monthly average | report only (lb/d) | all year | 004 |
| Mercury, total [as Hg] | monthly average | report only (lb/d) | all year | 004 |
| Mercury, total [as Hg] | daily maximum | report only (lb/d) | Jan, Apr, Jul, Oct | 004 |
| Mercury, total [as Hg] | daily maximum | report only (lb/d) | Jan, Apr, Jul, Oct | 004 |
| Mercury, total [as Hg] | daily maximum | report only (lb/d) | all year | 004 |
| Mercury, total [as Hg] | daily maximum | report only (lb/d) | all year | 004 |
| Mercury, total [as Hg] | 12-month average | ≤ 7 ng/L | all year | 004 |
| Mercury, total [as Hg] | 12-month average | ≤ 6 ng/L | all year | 004 |
| Mercury, total [as Hg] | 12-month average | ≤ 5 ng/L | Jan, Apr, Jul, Oct | 004 |
| Mercury, total [as Hg] | 12-month average | ≤ 5 ng/L | Jan, Apr, Jul, Oct | 004 |
| Mercury, total [as Hg] | 12-month average | ≤ .0003 lb/d | all year | 004 |
| Mercury, total [as Hg] | 12-month average | ≤ .017 lb/d | all year | 004 |
| Mercury, total [as Hg] | 12-month average | ≤ .0013 lb/d | Jan, Apr, Jul, Oct | 004 |
| Mercury, total [as Hg] | 12-month average | ≤ .0011 lb/d | Jan, Apr, Jul, Oct | 004 |
| Outfall observation,visual, y/n response | value | report only (N=0;Y=1) | all year | 004 |
| Outfall observation,visual, y/n response | value | report only (N=0;Y=1) | all year | 004 |
| Outfall observation,visual, y/n response | value | report only (N=0;Y=1) | all year | 004 |
| Outfall observation,visual, y/n response | value | report only (N=0;Y=1) | all year | 004 |
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) | all year | 006 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 006 |
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | May–Sep | 006 |
| pH | daily minimum | ≥ 6.5 SU | all year | 006 |
| pH | daily maximum | ≤ 9 SU | all year | 006 |
| Silver, total [as Ag] | monthly average | ≤ .86 ug/L | all year | 006 |
| Silver, total [as Ag] | daily maximum | report only (ug/L) | all year | 006 |
| Silver, total [as Ag] | monthly average | ≤ 1.1 lb/d | all year | 006 |
| Silver, total [as Ag] | daily maximum | report only (lb/d) | all year | 006 |
| Cyanide [A] | monthly average | ≤ 6.2 ug/L | all year | 006 |
| Cyanide [A] | daily maximum | report only (ug/L) | all year | 006 |
| Cyanide [A] | monthly average | ≤ 7.7 lb/d | all year | 006 |
| Cyanide [A] | daily maximum | report only (lb/d) | all year | 006 |
| Naphthalene | monthly average | ≤ 16 ug/L | all year | 006 |
| Naphthalene | daily maximum | report only (ug/L) | all year | 006 |
| Naphthalene | monthly average | ≤ 20 lb/d | all year | 006 |
| Naphthalene | daily maximum | report only (lb/d) | all year | 006 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 006 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 006 |
| Chlorine, total residual | daily maximum | report only (ug/L) | all year | 006 |
| Mercury, total [as Hg] | monthly average | report only (ng/L) | all year | 006 |
| Mercury, total [as Hg] | daily maximum | report only (ng/L) | all year | 006 |
| Mercury, total [as Hg] | monthly average | report only (lb/d) | all year | 006 |
| Mercury, total [as Hg] | daily maximum | report only (lb/d) | all year | 006 |
| Mercury, total [as Hg] | 12-month average | ≤ 7 ng/L | all year | 006 |
| Mercury, total [as Hg] | 12-month average | ≤ .009 lb/d | all year | 006 |
| Outfall observation,visual, y/n response | value | report only (N=0;Y=1) | all year | 006 |
Cited limits by parameter: Michigan's rules and the federal ones.
Same industry: the 9 Primary Metal Industries 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/MI0043524 · MCP: https://passage-data.com/mcp