UK Spill Containment Regulations — The Complete Guide (EA, HSE, COSHH, ADR)

Last updated: April 2026

Spill containment law in the UK is not found in a single Act or Regulation — it is a patchwork of overlapping obligations arising from environmental law, health and safety legislation, transport regulations, and agency guidance notes. Understanding how these frameworks interact is essential for any business that stores, uses, or transports liquid chemicals or oils.

This guide provides a definitive overview of every major piece of UK legislation and guidance that governs spill containment, from the Environment Agency's Pollution Prevention Guidance (PPG) through to the ADR transport regulations, explaining who enforces each framework, what they require, and what happens when businesses fall short.

Environment Agency — Pollution Prevention Guidance (PPG)

The Environment Agency (EA) is the primary environmental regulator in England. Its Pollution Prevention Guidance (PPG) notes are not statutory instruments, but they represent the EA's interpretation of regulatory requirements and are treated by courts as the standard of good practice. Deviation from PPG guidance significantly weakens your legal defence in the event of a pollution incident.

PPG2 — Above Ground Oil Storage

PPG2 is the most directly relevant guidance for businesses storing liquid fuels and oils. It requires:

• Secondary containment (bunding) capable of holding 110% of the largest container, or 25% of the total volume stored — whichever is greater
• Bund bases and walls impermeable to the stored substance
• No drain valve or pipe through the bund base unless fitted with an automatic closing mechanism
• Regular inspection and maintenance of bund integrity
• Pumps, valves, and sight gauges positioned within the bunded area

PPG22 — Incident Response

PPG22 deals with planning and responding to spills and incidents. It recommends that sites with significant liquid storage maintain an on-site spill response plan, appropriate containment equipment, and trained personnel capable of implementing the plan without delay. Browse our spill kits and portable bunds for compliant response equipment.

PPG26 — Safe Storage

PPG26 addresses above-ground storage of bulk liquids more broadly. Key requirements include site drainage management (no direct discharge to surface water), inspection regimes for storage tanks and secondary containment, and appropriate signage.

COSHH Regulations 2002 — Secondary Containment Requirements

The Control of Substances Hazardous to Health Regulations 2002 (SI 2002/2677) govern spill containment from a worker safety perspective. Regulation 7 requires that exposure to hazardous substances be prevented or adequately controlled using engineering controls as the first priority. Secondary containment — bunded pallets, spill trays, and bunded stores — is the principal engineering control for liquid chemical storage.

The COSHH Approved Code of Practice (ACoP L5) provides detailed guidance on adequate engineering controls for chemical storage. HSE inspectors apply this ACoP when assessing compliance, and departure from it places the burden of proof on the employer to demonstrate that an equivalent level of protection has been achieved.

Control of Pollution Act 1974

The Control of Pollution Act 1974 (CPA) provides the EA and local authorities with broad powers to address water and land pollution. Section 31 makes it an offence to cause or knowingly permit polluting matter to enter controlled waters — rivers, lakes, groundwater, coastal waters, and estuaries. The CPA established the legal framework subsequently strengthened by the Water Resources Act 1991 and the Environment Act 2021.

Of particular relevance to spill containment: the CPA underpins the Control of Pollution (Oil Storage) (England) Regulations 2001, which impose specific secondary containment requirements on oil storage above 200 litres on farms, and above 200 litres in other commercial settings unless stored in purpose-built above-ground fuel tanks.

Water Resources Act 1991

The Water Resources Act 1991 (WRA) is the primary legislation under which the EA prosecutes pollution incidents in England and Wales. Section 85 (now effectively replaced by the Environmental Permitting Regulations 2016 but carrying the same substance) makes it a criminal offence to:

• Cause any poisonous, noxious, or polluting matter to enter controlled waters
• Knowingly permit such entry to continue

Critically, under the WRA, causing pollution is a strict liability offence — no intent or negligence needs to be proven by the EA. If a chemical spill from your site reaches a river or watercourse, you are prima facie guilty, regardless of whether you took reasonable precautions. The only mitigation is demonstrating that you had adequate containment in place and responded appropriately to a genuinely unforeseeable event.

This is why secondary containment is not optional: it is your primary legal defence against WRA prosecution in the event of any liquid storage failure.

ADR — Transport of Dangerous Goods by Road

The European Agreement Concerning the International Carriage of Dangerous Goods by Road (ADR), implemented in the UK through the Carriage of Dangerous Goods and Use of Transportable Pressure Equipment Regulations 2009 (CDG Regulations), governs the transport of hazardous chemicals on public roads. Key spill containment requirements under ADR include:

• Vehicles must carry appropriate spill response equipment (absorbent material, drain plugs, shovels, collecting vessels)
• The quantity of absorbent required depends on the quantity and class of dangerous goods being transported
• Drivers must hold a valid ADR certificate for the classes of goods they carry
• Transport documents (including emergency action codes) must be carried in the cab
• Labelling of packages and vehicles must comply with UN placarding requirements

ADR applies to road transport. For internal site transport — moving drums and IBCs by forklift within your premises — the CDG Regulations do not apply, but your COSHH risk assessment must address the risks of internal handling and transfer.

HSE Enforcement — What Inspectors Look For

HSE inspectors have powers under the Health and Safety at Work etc. Act 1974 to enter premises, inspect, take samples, and issue enforcement notices. During a site inspection focused on liquid chemical storage and containment, inspectors will assess:

• Bund integrity: Cracks, corrosion, penetrations through the bund base or walls, accumulation of rainwater or product in the sump
• Bund capacity: Is it demonstrably 110% of the largest container? Inspectors may calculate this on site
• COSHH risk assessments: Present, current, substance-specific, and signed off by a competent person
• Spill response equipment: Correct type, adequate capacity, accessible, fully stocked
• Emergency procedures: Posted at storage areas; staff can explain what to do in the event of a spill
• Drainage controls: Evidence that drains in chemical storage areas are either bunded, plugged, or have interceptors installed
• Maintenance records: Evidence of periodic inspection of storage equipment and containment

Penalties and Prosecution Cases

In addition to criminal penalties, the EA can require remediation at the polluter's expense — costs that routinely run to tens or hundreds of thousands of pounds for contaminated land or watercourse cleanup. Civil claims by third parties (fisheries, water companies, downstream landowners) add further liability.

What Your Site Needs — A Regulatory Summary

For most commercial sites storing liquid chemicals or oils in the UK, the minimum compliance baseline requires:

1. Secondary containment (bunded pallets, spill trays, or bunded stores) at 110% of the largest container
2. Impermeable bund construction — no unplugged floor drains inside the bund
3. COSHH risk assessment covering all hazardous liquids stored
4. Spill response kit appropriate to the substances and volumes present
5. Staff training in spill response procedures
6. Regular inspection and maintenance records for all containment equipment
7. Site drainage management — no direct discharge to surface water drains

Our range of drum spill pallets, IBC bund pallets, portable bunds, and spill kits are designed to meet these requirements across all common storage configurations.