A clear, practical guide to your legal duties, reporting requirements and the right first response under UK environmental law.
A chemical or oil spill on a commercial site isn’t just an operational issue—it triggers legal responsibilities immediately. From the moment it happens, UK law expects the site operator to take prompt, reasonable steps to control the spill and notify the right bodies where required, even if the cause was equipment failure or a third party.
Many businesses only discover how wide these duties are when the Environment Agency gets involved. Acting early can reduce disruption and protect your reputation—waiting can quickly increase cost, risk and scrutiny.
This guide explains what the law expects, what to do first, and how to put the right controls in place to reduce risk next time.
Why chemical and oil spills are a legal matter
UK environmental law takes a strict approach to pollution of land, surface water and groundwater. The underlying principle is that the polluter pays—and in practice, the site operator can be held responsible even where a third party or equipment failure caused the spill.
The Environment Agency (EA) has wide enforcement powers, including:
- Issuing enforcement and stop notices requiring immediate remediation
- Serving remediation notices under the Environment Protection Act 1990
- Prosecuting businesses and individual directors for pollution offences
- Seeking unlimited fines in the Crown Court for serious offences
- Recovering the cost of any EA-led clean-up from the responsible operator
Put simply, “I didn’t know” is not a defence. If your response falls short—even for a small spill—you may face tougher action than a business that acts quickly, reports appropriately and ensures clean-up is completed correctly.
Key legislation to be aware of
Which rules apply depends on what has spilled, where it has gone, and what activities take place on your site. The most common spill-related duties come from:
| Legislation | What it covers in a spill context |
|---|---|
| Water Resources Act 1991 | Prohibits causing or knowingly allowing water pollution. One of the most commonly cited pieces of legislation in spill-related prosecutions. No intent required — the spill itself can be the offence. |
| Environmental Protection Act 1990 | Covers contamination of land (Part IIA) and the duty of care for controlled waste, including contaminated materials generated during a spill clean-up. |
| Environmental Permitting (England and Wales) Regulations 2016 | Regulates activities that could affect controlled waters. Sites operating under an Environmental Permit will typically have spill response conditions written in. |
| Control of Pollution Act 1974 | Relevant where spills affect ground or surface water via drainage. |
| COSHH Regulations 2002 | Requires employers to control exposure to hazardous substances — relevant to worker safety during a spill and clean-up. |
| Health and Safety at Work Act 1974 | Employers have a duty to ensure worker safety, including in emergency situations such as spills. |
| Dangerous Substances and Explosive Atmospheres Regulations 2002 (DSEAR) | Applies to sites storing or using flammable liquids and chemicals — may affect how a spill must be managed. |
For most commercial oil or chemical spills, the Water Resources Act 1991 and the Environmental Permitting (England and Wales) Regulations 2016 are key—especially if contamination has reached (or could reach) a drain, watercourse or groundwater.
Your immediate legal duties when a spill occurs
UK law doesn’t provide a single minute-by-minute checklist for every incident. Instead, the EA and the courts look at whether you took reasonable, proportionate steps to:
- Prevent the spill from worsening or spreading
- Protect controlled waters, drains and land from contamination
- Report the incident to the appropriate authorities where required
- Ensure the spill is cleaned up by competent persons using appropriate methods
- Dispose of contaminated materials lawfully
Missing any of these steps can turn a manageable incident into an enforcement issue—so it pays to respond quickly and document what you do.
Step-by-step: what to do when a spill happens
Step 1: Make it safe (people first)
Move anyone not needed for the response away from the area.
Identify the substance if you can—check your COSHH sheets or site chemical register.
Don’t approach an unknown spill without the right PPE. If the substance is unknown, toxic, flammable or involves gases/vapours, call the emergency services (999) and your spill response contractor.
If flammable liquids are involved, remove ignition sources where it’s safe to do so.
Never wash a spill into drains. This is a common mistake and can itself constitute a pollution offence.
Step 2: Stop the source and contain the spill
If it’s safe, stop the source (for example, close a valve, upright a drum, or shut off a pump).
Use your on-site containment: drain covers, spill berms, absorbent booms or granules.
Your spill kit should match the substances you store. If it doesn’t—or you don’t have one—treat this incident as a prompt to put the right kit and training in place.
Prioritise preventing the spill reaching any drain, gully or watercourse. Once contamination enters drainage or controlled waters, legal exposure can escalate quickly.
Step 3: Report to the Environment Agency (when required)
If the spill has reached—or could reach—a drain, watercourse, groundwater or other controlled waters, you should report it to the Environment Agency.
EA 24/7 incident hotline: 0800 80 70 60
Report immediately if the substance is acutely toxic, the volume is significant, it involves a fuel storage tank, or contamination has moved beyond your site boundary.
Early, voluntary reporting is typically taken into account in any subsequent EA enforcement decision. Where reporting is required, failing to do so may be treated as a separate offence.
Keep a record of your report: time, contact name and what information you provided.
Step 4: Bring in a licensed spill response contractor
Unless it’s genuinely minor (small volume, non-hazardous, fully contained on an impermeable surface), specialist support is the safest option.
A licensed contractor can supply the right equipment (for example, vacuum tankers and specialist pumps), trained operatives with appropriate PPE, compliant waste carriage and disposal, and an incident report that supports regulators and insurers.
CountyClean operates 24/7 emergency spill response across London and the South. If you need urgent support, call 01323 741818.
Avoid using untrained staff to manage significant volumes of oil, fuel or chemicals. This can create serious safety risks and increase your legal exposure.
Step 5: Document what happened
Take photographs and video before, during and after clean-up (where safe).
Record key times (discovery, containment, notifications) and the names of everyone involved.
Keep all waste paperwork: transfer notes, hazardous waste consignment notes and contractor invoices.
If the EA or your insurer reviews the incident, these records help demonstrate due diligence.
Step 6: Dispose of contaminated materials lawfully
Absorbents, soil, water, PPE and debris from clean-up are usually classed as controlled waste—and in many cases hazardous waste—under the Hazardous Waste (England and Wales) Regulations 2005.
These materials should be removed by a licensed waste carrier and taken to an appropriately permitted facility.
Keep waste transfer notes for at least 2 years and hazardous waste consignment notes for at least 3 years.
CountyClean holds the relevant waste carrier licences and can provide the documentation you need.
Step 7: Notify your insurer and review controls
Notify your insurer as soon as practicable. Many commercial policies include notification requirements, and delays can affect cover.
Once the incident is resolved, review your risk assessment and COSHH assessments.
Check whether spill containment, bunding or drainage controls need improving.
If it’s happened once, it’s now a foreseeable risk. Addressing the root cause helps prevent repeat incidents and strengthens your position if anything goes wrong again.
Specific rules for oil storage
If your site stores oil (including fuel oil, heating oil, lubricating oil or used oil), additional rules apply—whether or not a spill has occurred.
- The Control of Pollution (Oil Storage) Regulations 2001 generally require above-ground oil containers of 200 litres or more to be within a bund capable of holding 110% of the container’s volume.
- Bunds should be impermeable, have no drain valve, and be maintained so they’re effective when needed.
- Drum and IBC storage may also need bunding where total storage exceeds 200 litres.
- Non-compliance is an offence, and if a spill occurs from a non-compliant installation, enforcement action is far more likely.
What are the penalties for getting it wrong?
If a spill isn’t managed and reported correctly, the consequences can be serious:
- Unlimited fines in the Crown Court for serious water pollution offences under the Water Resources Act 1991
- Fixed monetary penalties from the EA for less serious breaches under civil sanctions powers
- Remediation notices requiring you to clean up contamination at your own cost – potentially including third-party land
- Personal liability for company directors where the offence was committed with their consent or connivance
- Criminal prosecution and potential custodial sentences in the most serious cases
- Reputational damage and potential loss of Environmental Permit
The EA also publishes details of prosecutions and enforcement actions. A conviction can affect your reputation, contracts, and your ability to keep (or obtain) an Environmental Permit.
How CountyClean can help
We support commercial operators across London and the South with specialist spill response—helping you act quickly, stay compliant and get back to normal operations sooner.
- 24/7 emergency spill response with rapid mobilisation of appropriate vehicles and trained operatives
- Containment, recovery and compliant disposal of spilled oil, fuel and chemicals
- Licensed waste carrier support and the paperwork needed for regulatory compliance
- Site decontamination and soil remediation where required
- Post-incident reporting to support EA notifications and insurance claims
- Spill kits and spill response planning tailored to your site
- Planned maintenance of oil interceptors, separators and bunded storage areas
We can also help you put prevention and response plans in place before an incident happens—reducing the likelihood of a spill and limiting impact if one occurs.