California waste code 571 Ash left over from furnaces, boilers & retorts.

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Based on California Title 22 and DTSC guidance
Nothing is stored

Miscellaneous
Fly, bottom or retort ash

Hazardous ash remaining after any applicable source-specific exclusion.

Hazardous fly ash, bottom ash and retort ash. The combustion or retort unit and the ash form set it apart.

Is California code 571 hazardous waste?

Not from the code alone. Waste must first be found hazardous. Code 571 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 571 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 571 cover?

This code is for hazardous fly ash carried out of combustion, ash settled at the bottom of a furnace, and ash from a retorting process. A federal fuel-combustion or mineral-processing exclusion covers only its stated source and conditions, and California hazards can remain.

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

Is furnace ash California code 571, 581 or 591?

Code	When it fits
571	Combustion or retorting produced fly ash, furnace-bottom ash or retort ash.
581	A gas scrubber produced the hazardous liquid, sludge or solid.
591	Fabric filters in a baghouse collected the hazardous dust or residue.

The alphabetical Appendix XII table has a typo. It says “ad” where the numerical table says “and.”

Which wastes take California code 571?

Waste	When it’s 571
Fly ash	Combustion produced particles carried out with the flue gas
Bottom ash	Combustion residue settled at the furnace bottom
Retort ash	The ash came from a retorting process

Which codes sit beside California code 571?

Code	What it is
521	Mud from drilling
531	Chemical toilet waste
541	Photographic processing chemicals
551	Discarded laboratory chemicals
561	Discarded detergent or soap
611	Hazardous contaminated soil
612	Collected household hazardous waste
613	Vehicle-shredder residue