Land contamination: risk management

How to assess if there's unacceptable risk, decide which options are the most suitable to manage the risk and implement remediation if needed.


This guidance is based on the Model procedures for the management of land contamination - contaminated land report (CLR11). The scope, framework and purpose remain the same.

The Environment Agency asked for feedback for 6 months in June 2019. We thank everyone who responded.

We are currently looking at the feedback and will republish in early 2020. We will withdraw CLR11 when this updated guidance is published.

To find more information see the CL:AIRE news item.

Manage land contamination

Land contamination can cause unacceptable risks to the environment and to people.

Dealing with land contamination helps make the environment clean and safe. Through regeneration it can:

  • enhance the health and well-being of all
  • add to the economic, ecological and amenity value of the area

Use the principles in this guidance to:

  • assess the risks
  • make appropriate decisions
  • take action where necessary

You can use this guide in a range of regulatory and management contexts such as voluntary remediation, planning, assessing liabilities or under the Part 2A contaminated land regime.

The Environment Agency expects you to follow this guide if you’re managing the risks from land contamination.

  1. Before you start What you need to know before you start the risk management process.
  2. Stage 1: Risk assessment How to do a land contamination risk assessment (RA).
  3. Stage 2: Options appraisal How to do a land contamination options appraisal (OA).
  4. Stage 3: Remediation How to develop a remediation strategy, implement it and verify remediation has worked.
  5. Site investigation How to plan for a site investigation.
  6. Reporting requirements The reports you must produce and the information they can include.