HP11: Mutagenic
Waste which may cause a mutation, that is a permanent change in the amount or structure of the genetic material in a cell.
What this usually means in practice
HP11 is the mutagenicity category and applies where the waste can cause permanent genetic changes in cells. In practice it depends on the presence and concentration of specific mutagenic substances rather than broad assumptions.
Definition
Exact definition wording taken from WM3 Appendix C / Annex III for this hazardous property.
waste which may cause a mutation, that is a permanent change in the amount or structure of the genetic material in a cell
What to check when assessing this property
Use the official definition, composition data and waste-process knowledge together. These points are meant to help frame the assessment, not replace WM3.
- Look for H340 and H341 classifications in the component substances.
- Pay attention to residues from chemical manufacture, laboratory processes and contaminated materials carrying mutagenic compounds.
- Where data is incomplete, do not ignore historical contamination routes that may introduce low-concentration but high-concern substances.
Supporting points
Additional points shown where the official definition or WM3 guidance breaks the hazard into categories or clarifications.
- H340 Muta. 1A or 1B triggers HP11 at 0.1% or more; H341 Muta. 2 triggers HP11 at 1.0% or more.
How to use this page
Hazardous properties explain why a waste may be hazardous. They sit alongside EWC classification and they do not replace formal WM3 assessment or site acceptance checks.
1. Start with the waste
Identify the likely EWC entry, the process that produced the waste and whether it is part of a mirror-entry assessment.
2. Check the hazard evidence
Use composition data, SDSs, testing, pH, flash point and process knowledge as relevant to the property in question.
3. Confirm the final outcome
Confirm the conclusion against WM3 and any permit-specific or site-specific acceptance requirements before relying on it.
Wording is based on Annex III of the consolidated Waste Framework Directive opens in a new tab and should be used alongside Waste classification technical guidance (WM3, 3rd edition, 2021) — GOV.UK opens in a new tab.