- List of Waste code
- 20 03 04
- WM3 entry type
- Absolute non-hazardous
- Official description
- Septic tank sludge
- Jurisdiction note
- WM3 GB reference; check national requirements for the site
Septic tank sludge under 20 03 04
WM3 lists 20 03 04 for septic tank sludge and classifies it as an absolute non-hazardous entry. The description is tied to the source of the waste, so it should not be used for every liquid collected by a sewage tanker or every material removed from an underground tank.
The system type and the source of the material should be confirmed from reliable site information. A local name for a tank is not enough if it is unclear whether the waste is actually septic tank sludge.
Waste classification and site hazards
An absolute non-hazardous entry does not mean the work is free from other hazards. Sewage and tank work can involve biological exposure and confined spaces, which are controlled separately from the waste classification.
Off-site movement still has to meet the carrier, documentation and receiving-site requirements that apply in the relevant jurisdiction, with an accurate description of the waste.
Unusual inputs to the system
Industrial chemicals, unusual cleaning wastes or other atypical inputs may mean the material no longer fits the septic tank sludge description and needs a different code or assessment. The source should be checked rather than assuming every collection from a tank is routine septic sludge.
Product information, incident history and analytical results, where available, can help resolve uncertainty about what has entered the system and how the waste should be described.
Collection records for septic tank sludge
Useful records identify the tank location and system type, the collection date and quantity where known, and the carrier and receiving facility. Emptying the tank is separate from assessing a drainage field or repairing other parts of the drainage system.