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04 02 20 Sludges from on-site effluent treatment other than those mentioned in 04 02 19

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

Not hazardous Mirror entry (non-hazardous side)

Official description: “sludges from on-site effluent treatment other than those mentioned in 04 02 19”

Where it sits: chapter 04 (wastes from the leather, fur and textile industries), section 04 02 (wastes from the textile industry).

What the hazard status means

This is one half of a “mirror” pair. You can only use this non-hazardous code once you have assessed the waste and shown it does not contain hazardous substances above the thresholds and has no hazardous properties. If you are not sure, it must be treated as hazardous.

Its mirror entry

04 02 19* Sludges from on-site effluent treatment containing hazardous substances Hazardous

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 04 02

04 02 09 Wastes from composite materials (impregnated textile, elastomer, plastomer) Not hazardous
04 02 10 Organic matter from natural products (for example grease, wax) Not hazardous
04 02 14* Wastes from finishing containing organic solvents Hazardous
04 02 15 Wastes from finishing other than those mentioned in 04 02 14 Not hazardous
04 02 16* Dyestuffs and pigments containing hazardous substances Hazardous
04 02 17 Dyestuffs and pigments other than those mentioned in 04 02 16 Not hazardous
04 02 19* Sludges from on-site effluent treatment containing hazardous substances Hazardous
04 02 21 Wastes from unprocessed textile fibres Not hazardous
04 02 22 Wastes from processed textile fibres Not hazardous
04 02 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.