What is the Contaminated Land Law in the UK?

The UK has a legal framework in place designed to deal with land contamination, protect public health and to safeguard the environment. Contaminated land is a hot topic as it can pose risks to human health, ecosystems, and water quality, and with the increasing demand for land redevelopment and housing it needs to be addressed.

Contaminated land refers to land where harmful substances are present in amounts that can pose risks to human health or damage the environment. These substances may include chemicals, asbestos, heavy metals, hydrocarbons, or waste products that have seeped into the ground over time. Contamination may arise from historical industrial processes, mining, waste disposal or accidental spillage.

Contaminated land is defined (under Part 2A of the Environmental Protection Act 1990) as land that is causing, or could cause significant harm to people, property or protected species, or pollution of controlled waters (rivers and lakes etc) because of substances in or under it.

Part 2A of the Environment Protection Act 1990

Part 2A of the Environmental Protection Act 1990 (mentioned above) is the cornerstone of contaminated land regulations in the UK. This was introduced in 2000, providing a systematic approach to identifying, managing and remediating contaminated land sites.

• The Role of Local Authorities – Local councils must identify and inspect land within their jurisdiction to determine whether it is contaminated.
• The Role of the Environment Agency – The Environment Agency supports local authorities and takes cases where large scale contamination is detected, and especially where controlled waters are at risk.
• Liability Framework – Responsibility for addressing contamination is the polluter, or if they are not identified then with the landowner or occupier.

Environmental Damage Regulations

The Environmental Damage (Prevention and Remediation) Regulations 2015 are based on the EU Environmental Liability Directive and focus on preventing and repairing significant environmental damage. They are particularly relevant when contamination causes harm to habitats, human health, or protected species.

Town and Country Planning Act 1990

The planning system must ensure that redevelopment is safe, so developers have to:

• Conduct site investigations to identify contamination risks.
• Propose remediation plans to address any hazards before construction begins.

Water Resources Act 1991

The Water Resources Act 1991 gives authorities the power to intervene if land contamination is likely to affect rivers, lakes, or groundwater.

There are various responsibilities for landowners, occupiers and developers when dealing with contaminated land. These include:

• Risk Assessments – Assessments must be conducted to identify whether there are any contamination risks, before development can begin. These include soil and groundwater sampling.
• Remediation Notices – Authorities can issue notices making responsible parties to undertake cleanup operations.
• Planning Conditions – When contaminated land is due for redevelopment, planning permissions may include conditions for remediation, making sure the site is safe for purpose.

The UK follows the ‘polluter pays’ principle, making those responsible for contamination bear the cost of remediation. Under Part 2A, liability is categorised as:

• Class A Persons – This is the original polluter who caused or knowingly allowed the contamination.
• Class B Persons – This is the current owner or occupier of the land, if the polluter cannot be identified or held accountable.

In cases where liability cannot be proven, remediations may rely on public funding. This may apply to cases where no responsible party exists due to historical contamination.

Remediation is a crucial step in managing contaminated land making sure it’s safe for use and poses no risk to the environment. The process involves several stages:

Site Investigation

Before remediation can begin, a detailed investigation to assess the extent and nature of the contamination must be completed. This involves

• Phase 1 – Desktop Study: Review of the historical land use and records to identify potential sources of contamination.
• Phase 2 – Intrusive Investigation: Collection of soil, water, and air samples to test contamination levels.

Risk Assessment

Using the data from the site investigations, risk assessments are carried out to evaluate the potential impact on human health, ecosystems, and controlled waters. This will determine the urgency and type of remediation required.

Selection of Remediation Techniques

The chosen remediation method depends on various factors such as the type of contaminant, site conditions, and the future us of the land. The techniques used can include:

• Excavation and Removal – The contaminated soil is excavated and transported to a licensed landfill site for disposal.
• Soil Washing – A process that removes contaminants from soil as particles using water or chemical agents.
• Bioremediation – This process uses microorganisms to break down organic pollutants into non-toxic substances.
• In-Situ Treatment – Techniques like air sparging or chemical oxidation are applied directly to the contaminated site without excavation.
• Capping and Containment – This process covers contaminated material with a protective layer to prevent exposure and leaching.

Implementation of Remediation

When the remediation plans are approved by regulatory authorities, they are implemented – monitoring is often carried out during and after the process to ensure effectiveness.

Validation and Certification

After remediation, the site can then be re-assessed to make sure that contamination levels are below the maximum regulatory standards. A validation report is submitted to the relevant local authority, showing that the site is safe and can be used for its intended purpose.

There is a strong emphasis on sustainability, and with increasing awareness of environmental, the management of contaminated land is ever evolving. Technology is offering new ways to tackle complex contamination and policy initiatives are pushing for the reuse of brownfield land to reduce the pressure on greenfield development.

Managing contaminated land requires efforts between regulators, landowners, developers, and environmental professionals. But with all involved carrying out their legal obligations, the UK can continue to tackle these pressing issues while supporting sustainable development.