The table below gives total reported waste volumes and corresponding masses, total packaged waste volumes, and corresponding number of packages for each category of waste. The table presents the information at 1 April 2025 with estimated future arising up to 2136.
Total wastes at 1 April 2025 and estimated for future arisings – Reported volumes and masses
| Waste type | Reported Volume (m3) | Reported Mass (t) |
| High Level Waste (HLW)(1) | 1,150 | 2,820 |
| Intermediate Level Waste (ILW) | 315,000 | 364,000 |
| Low Level Waste (LLW) | 1,470,000 | 1,830,000 |
| Very Low Level Waste (VLLW) | 2,690,000(2) | 2,690,000 |
| Total | 4,470,000 | 4,880,000 |
(1) The volume and mass do not include waste from reprocessing overseas spent fuel that will be exported to the country of origin. It assumes substitution arrangements are implemented.
(2) Includes 2,650,000 m3 reported volume from facility decommissioning at Sellafield. However, the current best estimate, albeit based on limited decommissioning experience, is that 70% of this material may be ‘out of scope’ of regulatory control.
Key facts
The total volume of radioactive waste in stock at 1 April 2025 and estimated to arise in future from all sources is 4,300,000m3
At 1 April 2025 the total reported volume of waste is 174,000 m3
About 93% of the total waste volume is of low activity (LLW and VLLW)
About 72% of the total waste volume is at Sellafield
2025 UK data
Waste in stock
Waste at 1 April 2025 includes all radioactive materials that had been declared as waste and were being held at this date.
Waste forecasts
Estimates of future radioactive waste arisings are projections made by the organisations that operate sites.
Other radioactive wastes and materials
Certain radioactive wastes and materials are reported separately from the main Inventory of radioactive wastes