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Nucor Steel-Plymouth Division

Blast Furnaces And Steel Mills, Plymouth, Utah. NPDES permit UT0023850, in force until Jan 31, 2029. 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 A monthly (11 values)
Last report on file: September 2026
Oct 2024 – Sep 2025: 0 values over a limit, 0 required values missing, 3 of 13 reports late

Limits in force (11)

Parameter	Statistic	Limit	Months
Flow rate	daily maximum	≤ .72 MGD	all year
Oxygen, dissolved [DO]	daily minimum	≥ 5 mg/L	all year
pH	minimum	≥ 6.5 SU	all year
pH	daily maximum	≤ 9 SU	all year
Solids, total suspended	30-day average	≤ 25 mg/L	all year
Solids, total suspended	maximum weekly average	≤ 35 mg/L	all year
Selenium, total recoverable	maximum weekly average	≤ 22.83 ug/L	all year
Selenium, total recoverable	daily maximum	≤ 63.3 ug/L	all year
Oil and grease	daily maximum	≤ 10 mg/L	all year
Solids, total dissolved	daily maximum	≤ 7000 mg/L	all year
Oil and grease visual	instantaneous maximum	≤ 0 N=0;Y=1	all year

How strict are these limits?

Oil and grease, daily maximum 10 mg/L — stricter than 88% of 209 other minor industrial and other permits nationwide; 11% have the same limit
Solids, total suspended, 30-day average 25 mg/L — stricter than 79% of 1,338 other minor industrial and other permits nationwide; 2% have the same limit
Solids, total suspended, maximum weekly average 35 mg/L — stricter than 77% of 856 other minor industrial and other permits nationwide; 1% have the same limit

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/UT0023850 · MCP: https://passage-data.com/mcp