California waste code 441 Yellow sludge built on sulfur, as from gas cleaning.

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Based on California Title 22 and DTSC guidance
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Sludges
Sulfur sludge

Sulfur characterizes the hazardous sludge.

Hazardous sludge characterized by sulfur. Sulfide in water-based liquid takes code 131 instead.

Is California code 441 hazardous waste?

Not from the code alone. Waste must first be found hazardous. Code 441 isn't a restricted code, but a restricted category that fits takes priority over it. A code that isn't restricted doesn't make waste non-hazardous.

When a shipment needs the Uniform Hazardous Waste Manifest, enter 441 in Item 13 for the waste line. Use one California code, plus the federal RCRA codes when the waste is federally hazardous.

RCRA waste meets a federal listing or characteristic, with no federal exclusion that applies. Non-RCRA waste is hazardous under California rules only. California presumes hazardous waste is RCRA unless the generator shows it isn't, so keep that determination.

What does California code 441 cover?

This code is for hazardous sludge marked by sulfur. It means sulfur as the sludge material, not a water-based liquid that merely holds sulfide anions.

Official wording: 22 CCR division 4.5, chapter 11, Appendix XII(b)

Is sulfur waste California code 441 or 131?

Code	When it fits
441	Process inputs or analysis identify sulfur as characterizing the sludge.
131	A water-based liquid has pH above 2 and below 12.5 and contains sulfide anions.

Physical form and chemical identity both matter. Sulfur in a sludge and sulfide anions in a qualifying water-based liquid are different cases.

Which wastes take California code 441?

Waste	When it’s 441
Sulfur sludge	Process inputs or analysis identify sulfur in the settled residue

Which codes sit beside California code 441?

Code	What it is
411	Alum or gypsum sludge
421	Lime sludge
431	Phosphate sludge
451	Sludge from degreasing
461	Paint sludge
471	Paper-processing sludge or pulp
481	Tetraethyl-lead sludge
491	Other hazardous sludge