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19 11 01* Spent filter clays

EWC / List of Waste code · Last checked 21 October 2026 · Applies across the UK (England, Wales, Scotland and Northern Ireland)

Hazardous Absolute hazardous entry

Official description: “spent filter clays”

Where it sits: chapter 19 (wastes from waste management facilities, off-site waste water treatment plants and the preparation of water intended for human consumption and water for industrial use), section 19 11 (wastes from oil regeneration).

What the hazard status means

Waste that matches this description is always hazardous waste, whatever the amount of hazardous substances in it. You do not need to test it to decide whether it is hazardous, but you still need to know its hazardous properties to fill in the paperwork.

Using this code

Write the code on the paperwork when waste is passed on: a waste transfer note for non-hazardous waste, or a consignment note for hazardous waste (called special waste in Scotland).
Choose the code from where the waste came from first (the chapter), then what it is. If a load is mixed, you may need more than one code.
The waste must go to a site whose permit allows that code. A registered carrier can tell you which codes they accept: check a waste carrier.
Businesses have a duty of care to describe their waste correctly.

Other codes in section 19 11

19 11 02* Acid tars Hazardous
19 11 03* Aqueous liquid wastes Hazardous
19 11 04* Wastes from cleaning of fuel with bases Hazardous
19 11 05* Sludges from on-site effluent treatment containing hazardous substances Hazardous
19 11 06 Sludges from on-site effluent treatment other than those mentioned in 19 11 05 Not hazardous
19 11 07* Wastes from flue-gas cleaning Hazardous
19 11 99 Wastes not otherwise specified Not hazardous

This page explains the code in plain English. It is not a classification of your waste. The official List of Waste and the classification guidance decide which code applies, and you are responsible for the code you use.

19 11 01* Spent filter clays

What the hazard status means

Using this code

Other codes in section 19 11

Official sources