California waste code 241 Sludge & residue scraped from the bottom of a tank.

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Based on California Title 22 and DTSC guidance
Nothing is stored

Organics
Tank-bottom waste

Hazardous residue removed from the bottom of a tank.

Hazardous residue removed from the bottom of a storage tank. The tank and the form of the residue set it apart from other sludge.

Is California code 241 hazardous waste?

Not from the code alone. The material must first be determined hazardous. California code 241 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 241 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 241 cover?

This is for hazardous residue that built up at the bottom of a tank and was removed from it. The tank source is essential. A sludge-like consistency alone isn't enough.

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

Is tank-bottom residue California code 241?

Code	When it fits
241	The hazardous residue built up at the bottom of a tank and was removed from it.
Another sludge code	A different process produced the sludge, or it wasn't tank-bottom residue.

Identify the equipment and where the residue collected. Appearance alone doesn't decide this source-specific code.

Which wastes take California code 241?

Waste	When it’s 241
Tank bottom waste	The residue was removed from the bottom of a tank.

Which codes sit beside California code 241?

Code	What it is
222	Oil-water separator sludge
223	Other oily hazardous waste
231	Pesticide rinse water
232	Pesticide and pesticide-production waste
251	Still bottoms with halogenated organics
252	Other still-bottom waste
261	PCB-containing material
271	Unreacted resin and monomers