California waste code 251 Distillation residue holding chlorinated or other halogenated organics.

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Based on California Title 22 and DTSC guidance
Nothing is stored

Organics
Still bottoms with halogenated organics

Hazardous distillation residue containing halogenated organic compounds.

Hazardous still bottoms containing halogenated organic compounds. Distillation residue without halogens takes code 252.

Is California code 251 hazardous waste?

Not from the code alone. The material must first be determined hazardous. California code 251 is not restricted, and a restricted code takes priority over it. A non-restricted code doesn't make a waste non-hazardous.

If the shipment needs the Uniform Hazardous Waste Manifest, enter 251 in Item 13 for the waste line. Use one California code, plus any federal RCRA codes when the waste is federally hazardous.

Waste is RCRA waste when it meets a federal listing or characteristic and no federal exclusion 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 251 cover?

This is for hazardous residue left at the bottom of a still after distillation, when halogenated organic compounds are present. It needs both the distillation source and the residue's composition.

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

Is still-bottom residue with halogens California code 251?

Code	When it fits
251	Distillation produced the residue and halogenated organic compounds are present.
252	Distillation produced the hazardous residue with no halogenated organic compounds.

Use process records and composition evidence. Dark color or sludge form doesn't show halogenated-organic content. For solid or sludge residues, code 751 may take priority, but its published units conflict, so confirm them.

Which wastes take California code 251?

Waste	When it’s 251
Halogenated still bottoms	Distillation residue holds organic compounds with chlorine, fluorine, bromine or iodine.

Which codes sit beside California code 251?

Code	What it is
222	Oil-water separator sludge
223	Other oily hazardous waste
231	Pesticide rinse water
232	Pesticide and pesticide-production waste
241	Tank-bottom waste
261	PCB-containing material
271	Unreacted resin and monomers
272	Polymeric resin waste