HP11: Mutagenic
Waste that can cause permanent changes (mutations) to genetic material.
What HP11 means
HP11 covers waste that can cause a mutation: a permanent change to the genetic material in a cell. WM3's rule for unidentified oil makes a waste HP7 and HP11 at the same level.
The HP11 thresholds
Each limit applies to any one substance. Nothing is added up, and there's no cut-off.
| Hazard statement | Makes the waste HP |
|---|---|
| H340 (mutagen, category 1A or 1B) | 0.1% or more |
| H341 (mutagen, category 2) | 1% or more |
For oil whose identity isn't known, total petroleum hydrocarbons of 0.1% or more make the waste HP11 (and HP7), unless tests show benzo[a]pyrene is below 0.01% of the oil.
Where you're likely to meet it
- Unleaded petrol, typically HP11 among other properties.
- Waste contaminated with oil of unknown identity at 0.1% or more, without marker tests.
- Cytotoxic and cytostatic medicines.
What it changes when the waste moves
A waste needs only one hazardous property to be hazardous waste. In England and Wales it then moves on a hazardous waste consignment note in place of a waste transfer note, and the note goes with the load to the site that receives it.
On Digital Waste Tracking, the site that receives a hazardous load records its HP codes alongside the EWC code (the six-digit code from the List of Wastes that says what a waste is).
Sources
- WM3: Waste classification technical guidance (v1.2.GB): Appendix C11, pages C39 to C40; oils, pages 28 to 30
- GOV.UK: Healthcare and related wastes, how to classify
- Annex III to the Waste Framework Directive (HP1 to HP15)
- GOV.UK: Hazardous waste consignment notes
- The Digital Waste Tracking (England) Regulations 2026: the paragraphs on hazardous properties and POPs, 15 and 16
This page explains the rules. Check the waste itself against WM3 before it moves.
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CarrierNote is on the GOV.UK software provider list, connected to DEFRA's Digital Waste Tracking service. Receiving sites are in scope from October 2026 and carriers from October 2027, and you can be recording to DEFRA's standard from your first load, whenever you start.