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19 08 12 Sludges from biological treatment of industrial waste water other than those mentioned in 19 08 11

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 biological treatment of industrial waste water other than those mentioned in 19 08 11”

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 08 (wastes from waste water treatment plants not otherwise specified).

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

19 08 11* Sludges containing hazardous substances from biological treatment of industrial waste water 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 19 08

19 08 01 Screenings Not hazardous
19 08 02 Waste from desanding Not hazardous
19 08 05 Sludges from treatment of urban waste water Not hazardous
19 08 06* Saturated or spent ion exchange resins Hazardous
19 08 07* Solutions and sludges from regeneration of ion exchangers Hazardous
19 08 08* Membrane system waste containing heavy metals Hazardous
19 08 09 Grease and oil mixture from oil/water separation containing only edible oil and fats Not hazardous
19 08 10* Grease and oil mixture from oil/water separation other than those mentioned in 19 08 09 Hazardous
19 08 11* Sludges containing hazardous substances from biological treatment of industrial waste water Hazardous
19 08 13* Sludges containing hazardous substances from other treatment of industrial waste water Hazardous
19 08 14 Sludges from other treatment of industrial waste water other than those mentioned in 19 08 13 Not hazardous
19 08 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.