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Steel Dynamics Columbus LLC

Blast Furnaces And Steel Mills, Columbus, Mississippi. NPDES permit MS0059994, in force until Mar 31, 2027. Last 12 months: no values over a limit, 3 of 34 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (4 values), outfall 101 form A monthly (44 values), outfall 102 form A monthly (2 values), outfall 002 form Y yearly
Renewal application due
Oct 2, 2026 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 3 of 37 reports late

Limits in force (54)

ParameterStatisticLimitMonthsOutfall
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall 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
pHdaily minimum≥ 6 SUall year002
pHdaily maximum≤ 9 SUall year002
Flow, in conduit or thru treatment plantannual averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
pHdaily minimum≥ 6 SUall year101
pHdaily maximum≤ 9 SUall year101
Solids, total suspendedmonthly averagereport only (mg/L)all year101
Solids, total suspendeddaily maximumreport only (mg/L)all year101
Solids, total suspendedmonthly average≤ 599 lb/dall year101
Solids, total suspendeddaily maximum≤ 1531 lb/dall year101
Oil & Greasemonthly averagereport only (mg/L)all year101
Oil & Greasedaily maximumreport only (mg/L)all year101
Oil & Greasemonthly average≤ 104 lb/dall year101
Oil & Greasedaily maximum≤ 400 lb/dall year101
Iron, total recoverablemonthly averagereport only (mg/L)all year101
Iron, total recoverabledaily maximumreport only (mg/L)all year101
Iron, total recoverablemonthly average≤ 25.7 lb/dall year101
Iron, total recoverabledaily maximum≤ 51.3 lb/dall year101
Zinc, total recoverablemonthly averagereport only (mg/L)all year101
Zinc, total recoverabledaily maximumreport only (mg/L)all year101
Zinc, total recoverablemonthly average≤ 5.4 lb/dall year101
Zinc, total recoverabledaily maximum≤ 16.2 lb/dall year101
Lead, total recoverablemonthly averagereport only (mg/L)all year101
Lead, total recoverabledaily maximumreport only (mg/L)all year101
Lead, total recoverablemonthly average≤ 3.7 lb/dall year101
Lead, total recoverabledaily maximum≤ 11 lb/dall year101
Chromium, total recoverablemonthly averagereport only (mg/L)all year101
Chromium, total recoverabledaily maximumreport only (mg/L)all year101
Chromium, total recoverablemonthly average≤ .064 lb/dall year101
Chromium, total recoverabledaily maximum≤ .156 lb/dall year101
Copper, total recoverablemonthly averagereport only (mg/L)all year101
Copper, total recoverabledaily maximumreport only (mg/L)all year101
Copper, total recoverablemonthly average≤ .226 lb/dall year101
Copper, total recoverabledaily maximum≤ .474 lb/dall year101
Tetrachloroethylenemonthly averagereport only (mg/L)all year101
Tetrachloroethylenedaily maximumreport only (mg/L)all year101
Tetrachloroethylenemonthly averagereport only (lb/d)all year101
Tetrachloroethylenedaily maximum≤ .0732 lb/dall year101
Naphthalenemonthly averagereport only (mg/L)all year101
Naphthalenedaily maximumreport only (mg/L)all year101
Naphthalenemonthly averagereport only (lb/d)all year101
Naphthalenedaily maximum≤ .0488 lb/dall year101
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year101
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year101
Cyanide, total recoverablemonthly averagereport only (mg/L)all year101
Cyanide, total recoverabledaily maximumreport only (mg/L)all year101
Cyanide, total recoverablemonthly average≤ .035 lb/dall year101
Cyanide, total recoverabledaily maximum≤ .087 lb/dall year101
pHminimum≥ 7.5 SUall year102
pHmaximum≤ 9 SUall year102

How strict are these limits?

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

Same industry: the 4 Primary Metal Industries permits in Mississippi.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MS0059994 · MCP: https://passage-data.com/mcp