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Nucor Corporation-Nucor Steel Hickman Mill

Blast Furnaces And Steel Mills, major discharger, Blytheville, Arkansas. NPDES permit AR0045977, in force until Sep 30, 2028. Last 12 months: over a limit 2 times (last February 2026), 2 of 28 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 002 form A monthly (23 values), outfall 004 form A2 monthly (28 values), outfall TX4 form Q quarterly (12 values)
Renewal application due
Apr 3, 2028 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 1 of 28 reports late

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

Period endingParameterReportedLimitOver by
October 2025Nitrogen, ammonia total [as N], daily maximum< 17.9 mg/L≤ 7.5 mg/L139%
February 2026Solids, total suspended, daily maximum46 mg/L≤ 30 mg/L53%

Limits in force (75)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]instantaneous minimum≥ 2 mg/Lall year002
pHminimum≥ 6 SUall year002
pHmaximum≤ 9 SUall year002
Solids, total suspendedmonthly average≤ 20 mg/Lall year002
Solids, total suspendeddaily maximum≤ 30 mg/Lall year002
Solids, total suspendedmonthly average≤ 5 lb/dall year002
Solids, total suspendeddaily maximum≤ 7.5 lb/dall year002
Oil & Greasemonthly average≤ 10 mg/Lall year002
Oil & Greasedaily maximum≤ 15 mg/Lall year002
Oil & Greasemonthly average≤ 2.5 lb/dall year002
Oil & Greasedaily maximum≤ 3.8 lb/dall year002
Nitrogen, ammonia total [as N]monthly average≤ 5 mg/LMay–Oct002
Nitrogen, ammonia total [as N]monthly average≤ 10 mg/LJan, Feb, Mar, Nov, Dec002
Nitrogen, ammonia total [as N]monthly average≤ 5.2 mg/LApr002
Nitrogen, ammonia total [as N]daily maximum≤ 7.5 mg/LMay–Oct002
Nitrogen, ammonia total [as N]daily maximum≤ 14.7 mg/LJan, Feb, Mar, Nov, Dec002
Nitrogen, ammonia total [as N]daily maximum≤ 5.2 mg/LApr002
Nitrogen, ammonia total [as N]monthly average≤ 1.3 lb/dMay–Oct002
Nitrogen, ammonia total [as N]monthly average≤ 2.5 lb/dJan, Feb, Mar, Nov, Dec002
Nitrogen, ammonia total [as N]monthly average≤ 1.3 lb/dApr002
Nitrogen, ammonia total [as N]daily maximum≤ 1.9 lb/dMay–Oct002
Nitrogen, ammonia total [as N]daily maximum≤ 3.7 lb/dJan, Feb, Mar, Nov, Dec002
Nitrogen, ammonia total [as N]daily maximum≤ 1.3 lb/dApr002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Coliform, fecal general30-day geometric mean≤ 1000 #/100mLall year002
Coliform, fecal general7-day geometric mean≤ 2000 #/100mLall year002
BOD, carbonaceous [5 day, 20 C]monthly average≤ 20 mg/LJan, Feb, Mar, Apr, Nov, Dec002
BOD, carbonaceous [5 day, 20 C]monthly average≤ 15 mg/LMay–Oct002
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 30 mg/LJan, Feb, Mar, Apr, Nov, Dec002
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 23 mg/LMay–Oct002
BOD, carbonaceous [5 day, 20 C]monthly average≤ 5 lb/dJan, Feb, Mar, Apr, Nov, Dec002
BOD, carbonaceous [5 day, 20 C]monthly average≤ 3.8 lb/dMay–Oct002
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 7.5 lb/dJan, Feb, Mar, Apr, Nov, Dec002
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 5.8 lb/dMay–Oct002
pHminimum≥ 6 SUall year004
pHmaximum≤ 9 SUall year004
Solids, total suspendedmonthly averagereport only (mg/L)all year004
Solids, total suspendeddaily maximumreport only (mg/L)all year004
Solids, total suspendedmonthly average≤ 656.9 lb/dall year004
Solids, total suspendeddaily maximum≤ 1669.3 lb/dall year004
Oil & Greasemonthly average≤ 10 mg/Lall year004
Oil & Greasedaily maximum≤ 15 mg/Lall year004
Oil & Greasemonthly average≤ 110.1 lb/dall year004
Oil & Greasedaily maximum≤ 180.1 lb/dall year004
Nickel, total recoverablemonthly averagereport only (ug/L)all year004
Nickel, total recoverabledaily maximumreport only (ug/L)all year004
Nickel, total recoverablemonthly average≤ .6 lb/dall year004
Nickel, total recoverabledaily maximum≤ 1.1 lb/dall year004
Zinc, total recoverablemonthly averagereport only (ug/L)all year004
Zinc, total recoverabledaily maximumreport only (ug/L)all year004
Zinc, total recoverablemonthly average≤ 3.1 lb/dall year004
Zinc, total recoverabledaily maximum≤ 9.4 lb/dall year004
Lead, total recoverablemonthly averagereport only (ug/L)all year004
Lead, total recoverabledaily maximumreport only (ug/L)all year004
Lead, total recoverablemonthly average≤ 2.2 lb/dall year004
Lead, total recoverabledaily maximum≤ 6.7 lb/dall year004
Chromium, total recoverablemonthly averagereport only (ug/L)all year004
Chromium, total recoverabledaily maximumreport only (ug/L)all year004
Chromium, total recoverablemonthly average≤ .1 lb/dall year004
Chromium, total recoverabledaily maximum≤ .3 lb/dall year004
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year004
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year004
Whole effluent toxicity - retest #148-hour minimumreport only (pass=0;fail=1)all yearTX4
Whole effluent toxicity - retest #248-hour minimumreport only (pass=0;fail=1)all yearTX4
WET, sublethal retest #148-hour minimumreport only (pass=0;fail=1)all yearTX4
WET, sublethal retest #248-hour minimumreport only (pass=0;fail=1)all yearTX4
Whole Effluent Toxicity - Retest #348-hour minimumreport only (pass=0;fail=1)all yearTX4
Whole Effluent Toxicity, Sub-Lethal Retest #348-hour minimumreport only (pass=0;fail=1)all yearTX4
Low Flow Pass/Fail Static Renewal 48Hr Acute Daphnia pulex48-hour minimumreport only (pass=0;fail=1)all yearTX4
LF Pass/Fail Static Renewal 48Hr Acute Pimephales promelas48-hour minimumreport only (pass=0;fail=1)all yearTX4
NOAEC Lethal Statis Renewal 48 Hr Acute Daphnia pulex48-hour minimumreport only (%)all yearTX4
NOAEC Lethal Static Renewal 48Hr acute Pimephales promelas48-hour minimumreport only (%)all yearTX4
Coef Of Var Static Renewal 48Hr Acute D. pulex48-hour minimumreport only (%)all yearTX4
Coef Of Var Static Renewal 48Hr Acute Pimephales promelas48-hour minimumreport only (%)all yearTX4

How strict are these limits?

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

Same industry: the 10 Primary Metal Industries permits in Arkansas.

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Your permit document is the final word. As JSON: /api/v1/permits/AR0045977 · MCP: https://passage-data.com/mcp