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Nucor Steel Connecticut, Inc.

Blast Furnaces And Steel Mills, Wallingford, Connecticut. NPDES permit CT0026794 expired Jul 31, 2026; its limits still apply. Last 12 months: no values over a limit, 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form 1 monthly (45 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 33 required values missing, 5 of 12 reports late

Limits in force (56)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheitinstantaneous maximumreport only (deg F)all year
Flow ratemonthly average≤ 30000 gal/dall year
Conductivityinstantaneous maximumreport only (umho/cm)all year
BOD, 5-day, 20 deg. Cdaily maximum≤ 15 mg/LFeb, May, Aug, Nov
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)Jan, Mar, Apr, Jun, Jul, Sep, Oct, Dec
pHinstantaneous minimum≥ 6 SUall year
pHinstantaneous maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 20 mg/Lall year
Solids, total suspendeddaily maximum≤ 30 mg/Lall year
Solids, total suspendedmonthly average≤ 2.271 kg/dall year
Solids, total suspendeddaily maximum≤ 3.406 kg/dall year
Oil & Greasemonthly average≤ 10 mg/Lall year
Oil & Greasedaily maximumreport only (mg/L)all year
Oil & Greasemonthly average≤ 1.135 kg/dall year
Oil & Greasedaily maximumreport only (kg/d)all year
Cadmium, total [as Cd]monthly average≤ .007 mg/LFeb, May, Aug, Nov
Cadmium, total [as Cd]monthly averagereport only (mg/L)Jan, Mar, Apr, Jun, Jul, Sep, Oct, Dec
Cadmium, total [as Cd]daily maximum≤ .014 mg/LFeb, May, Aug, Nov
Cadmium, total [as Cd]daily maximumreport only (mg/L)Jan, Mar, Apr, Jun, Jul, Sep, Oct, Dec
Chromium, total [as Cr]monthly average≤ 1 mg/LFeb, May, Aug, Nov
Chromium, total [as Cr]monthly averagereport only (mg/L)Jan, Mar, Apr, Jun, Jul, Sep, Oct, Dec
Chromium, total [as Cr]daily maximum≤ 2 mg/LFeb, May, Aug, Nov
Chromium, total [as Cr]daily maximumreport only (mg/L)Jan, Mar, Apr, Jun, Jul, Sep, Oct, Dec
Copper, total [as Cu]monthly average≤ .32 mg/Lall year
Copper, total [as Cu]daily maximum≤ .65 mg/Lall year
Iron, total [as Fe]monthly average≤ 3 mg/LFeb, May, Aug, Nov
Iron, total [as Fe]monthly averagereport only (mg/L)Jan, Mar, Apr, Jun, Jul, Sep, Oct, Dec
Iron, total [as Fe]daily maximum≤ 5 mg/LFeb, May, Aug, Nov
Iron, total [as Fe]daily maximumreport only (mg/L)Jan, Mar, Apr, Jun, Jul, Sep, Oct, Dec
Lead, total [as Pb]monthly average≤ .069 mg/Lall year
Lead, total [as Pb]daily maximum≤ .138 mg/Lall year
Nickel, total [as Ni]monthly average≤ 1 mg/Lall year
Nickel, total [as Ni]daily maximum≤ 2 mg/Lall year
Zinc, total [as Zn]monthly average≤ .72 mg/Lall year
Zinc, total [as Zn]daily maximum≤ 1.73 mg/Lall year
Aluminum, total [as Al]monthly average≤ 1.48 mg/Lall year
Aluminum, total [as Al]daily maximum≤ 3.99 mg/Lall year
Aluminum, total [as Al]monthly average≤ .168 kg/dall year
Aluminum, total [as Al]daily maximum≤ .453 kg/dall year
Di[2-ethylhexyl] phthalate [DEHP]daily maximumreport only (mg/L)Feb, May, Aug, Nov
Di[2-ethylhexyl] phthalate [DEHP]daily maximumreport only (mg/L)Jan, Mar, Apr, Jun, Jul, Sep, Oct, Dec
Flow, maximum during 24 hr perioddaily maximum≤ 50000 gal/dall year
Chlorine, total residualmonthly average≤ .048 mg/Lall year
Chlorine, total residualdaily maximum≤ .144 mg/Lall year
Chlorine, total residualmonthly average≤ 5.5 g/dall year
Chlorine, total residualdaily maximum≤ 16.3 g/dall year
E. coliinstantaneous maximumreport only (#/100mL)Feb, May, Aug, Nov
pH, maximuminstantaneous maximum≤ 9 SUall year
pH, minimuminstantaneous minimum≥ 6 SUall year
Flowdaily maximum≤ 50000 gal/dall year
NOEC Static Renewal 7Day Chronic Ceriodaphnia dubiainstantaneous minimumreport only (%)Jul–Sep
NOEC Static Renewal 7Day Chronic Pimephales promelasinstantaneous minimumreport only (%)Jul–Sep
NOAEL Static 48Hr Acute D. pulexinstantaneous minimum≥ 36 %Feb, May, Aug, Nov
NOAEL Static 48Hr Acute D. pulexinstantaneous minimumreport only (%)Jan, Mar, Apr, Jun, Jul, Sep, Oct, Dec
NOAEL Static 48Hr Acute Pimephales promelasinstantaneous minimumreport only (%)Jan, Mar, Apr, Jun, Jul, Sep, Oct, Dec
NOAEL Static 48Hr Acute Pimephales promelasinstantaneous minimum≥ 36 %Feb, May, Aug, Nov

How strict are these limits?

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

Same industry: the 3 Primary Metal Industries permits in Connecticut.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/CT0026794 · MCP: https://passage-data.com/mcp