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06 07 04* Solutions and acids, for example contact acid

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: “solutions and acids, for example contact acid”

Where it sits: chapter 06 (wastes from inorganic chemical processes), section 06 07 (wastes from the MFSU of halogens and halogen chemical processes).

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 06 07

06 07 01* Wastes containing asbestos from electrolysis Hazardous
06 07 02* Activated carbon from chlorine production Hazardous
06 07 03* Barium sulphate sludge containing mercury Hazardous
06 07 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.

06 07 04* Solutions and acids, for example contact acid

What the hazard status means

Using this code

Other codes in section 06 07

Official sources