T33 waste exemption: recover central heating oil by filtration

The T33 exemption allows you to filter central heating oil from disused tanks so that it can be reused.

Applies to England

Types of activity you can carry out

Includes filtering central heating oil from disused tanks so that the oil can be reused.

Types of activity you cannot carry out

You cannot:

  • treat any other types of oil by filtration
  • treat central heating oil for disposal
  • mix hazardous waste with other hazardous or non-hazardous waste

Types of waste you can treat

The waste codes are those listed in the List of Wastes (LoW) Regulations. You need to make sure your waste fits within the relevant waste code and description.

Waste code Type of waste
130701* Central heating oil only

*hazardous waste

Quantity of waste you can treat

You can treat up to 400 litres of central heating oil over any 7-day period.

Key conditions

The waste must be:

  • stored with secondary containment
  • treated in a location with sealed drainage

Register this exemption

You must register this exemption with the Environment Agency if you meet the requirements.


Hazardous waste – see How to classify different types of waste.

Secondary containment – a bund or any other system for preventing waste that has leaked from its main container from escaping from the place where it is stored or treated.

Sealed drainage – a drainage system with an impermeable surface that makes sure that:

  • no liquid will run off the surface apart from via the system
  • except where they may be lawfully discharged, all liquids entering the system are collected in a sealed sump
Published 28 April 2014