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10 12 13 Sludge from on-site effluent treatment

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

Not hazardous Absolute non-hazardous entry

Official description: “sludge from on-site effluent treatment”

Where it sits: chapter 10 (wastes from thermal processes), section 10 12 (wastes from manufacture of ceramic goods, bricks, tiles and construction products).

What the hazard status means

Waste that matches this description is not hazardous waste. Check that nothing hazardous has been mixed in: a load that contains hazardous waste needs a different code.

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 10 12

10 12 01 Waste preparation mixture before thermal processing Not hazardous
10 12 03 Particulates and dust Not hazardous
10 12 05 Sludges and filter cakes from gas treatment Not hazardous
10 12 06 Discarded moulds Not hazardous
10 12 08 Waste ceramics, bricks, tiles and construction products (after thermal processing) Not hazardous
10 12 09* Solid wastes from gas treatment containing hazardous substances Hazardous
10 12 10 Solid wastes from gas treatment other than those mentioned in 10 12 09 Not hazardous
10 12 11* Wastes from glazing containing heavy metals Hazardous
10 12 12 Wastes from glazing other than those mentioned in 10 12 11 Not hazardous
10 12 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.

10 12 13 Sludge from on-site effluent treatment

What the hazard status means

Using this code

Other codes in section 10 12

Official sources