Tyre Stockpile Risks: Fire, Pollution, and Legal Liability

Updated on: 3rd March 2026 By:

Why Tyre Stockpiles Are a Serious Risk

A stockpile of used tyres is not simply a pile of old rubber. It is, from a fire risk, public health, and regulatory liability perspective, one of the more hazardous waste accumulations a business can have on its property. Tyre fires, once started, burn with extraordinary intensity at temperatures that can exceed 1,000°C. They generate toxic smoke visible for miles and containing a complex cocktail of combustion products including polycyclic aromatic hydrocarbons, carbon monoxide, sulphur dioxide, hydrogen sulphide, and heavy metal particulates. They are extremely difficult to extinguish; tyre fire incidents lasting weeks or months are documented in the UK.

Beyond fire, stockpiled tyres collect rainwater in their cavities, creating stagnant warm water environments ideal for mosquito breeding. The runoff from tyre stockpiles exposed to weathering contains zinc, sulphur compounds, and other leachates from the rubber compound that pollute surface water and groundwater if allowed to reach drainage systems or watercourses.

For businesses generating or storing used tyres, these risks translate directly into regulatory obligations, insurance requirements, and in the event of an incident, potential criminal and civil liability. Understanding the risk profile and the regulatory framework governing tyre storage is not optional; it is a legal and commercial necessity.

Gradeall International manufactures tyre processing equipment that directly reduces stockpile risk by converting stored tyres into processed products that are collected and transported off-site. The MKII tyre baler reduces car tyres into PAS 108 bales that leave the site as a civil engineering product. Gradeall’s sidewall cutters and processing equipment reduce large tyre stockpiles into manageable fractions. With nearly 40 years of manufacturing experience and equipment in over 100 countries, Gradeall’s tyre processing equipment is part of the practical solution to tyre stockpile risk.

The Fire Risk: Why Tyre Fires Are Uniquely Dangerous

Tyre rubber contains a substantial fraction of carbon black, petroleum-derived oil extenders, and rubber hydrocarbons with very high calorific values. Once ignition occurs, the thermal energy released sustains and spreads the fire through the stockpile, reaching temperatures that are beyond the extinguishing capability of standard firefighting water application. Water applied to a burning tyre pile can produce steam explosions, spread burning material, and create runoff contaminated with combustion products.

The UK Fire and Rescue Service has documented large tyre stockpile fires that required days to weeks of active intervention and left contaminated soil and water requiring remediation. The Heyope tyre dump fire in Wales in 1989 burned for over a year and became a landmark case for tyre waste regulation. More recent incidents at smaller commercial stockpile sites continue to demonstrate the hazard.

Ignition sources for tyre stockpiles. Tyres can be ignited by deliberate arson (tyre storage sites have historically been arson targets), by accidental ignition from sparks or machinery, by spontaneous heating in very large tightly packed stockpiles under certain conditions, and by hot weather combined with fuel accumulation. The self-insulating nature of a large tyre pile means that heat generated within the pile is difficult to dissipate.

Insurance implications. Commercial property insurers apply significant loading to or exclusions for policies covering sites with substantial tyre stockpiles. An operation that accumulates a large tyre stockpile without informing its insurer may find that fire damage is excluded from its policy on the basis of an undisclosed material risk. Insurers increasingly require compliance with specific tyre storage standards as a condition of coverage.

Environment Agency Guidance on Tyre Storage

The Environment Agency’s position paper on tyre storage, updated following several significant tyre fire incidents, sets out management requirements for sites storing used tyres. While some requirements are advisory for businesses not requiring an environmental permit, the guidance represents the standard against which compliance will be assessed in the event of an incident or enforcement action.

Maximum stockpile size. The Environment Agency recommends limiting tyre stockpiles to 1,000 tonnes or 1,000 square metres coverage, with individual bays not exceeding 500 tonnes. Stockpiles significantly exceeding these limits require robust management justification and are likely to attract regulatory scrutiny.

Fire breaks. Bays of tyres should be separated by fire breaks of at least 6 metres to limit fire spread between bays. The fire break must be kept clear of combustible material.

Access for fire services. Emergency vehicle access routes around the stockpile must be maintained at all times. A fire service that cannot access the stockpile perimeter cannot effectively intervene.

Fire suppression infrastructure. Sites with large tyre stockpiles should have fire suppression infrastructure appropriate to the risk, which may include fixed water deluge systems for the largest stockpiles. The specific requirements depend on site size and regulatory permit conditions.

Environmental permit thresholds. Sites storing more than 40,000 tyres (or the weight equivalent) require an environmental permit from the Environment Agency (or equivalent regulators in devolved nations). Sites below this threshold may operate under registered exemptions. Operating above the permit threshold without a permit is a criminal offence.

Legal Liability: What Happens When Things Go Wrong

The legal liability implications of a tyre stockpile fire or pollution incident extend well beyond the immediate clean-up cost.

Environmental remediation liability. Under the Environmental Protection Act 1990 and the Environmental Damage (Prevention and Remediation) Regulations, the operator of a site from which environmental contamination originates has the primary liability for remediation costs. A tyre fire that contaminates soil and groundwater with combustion products and leachate creates a remediation obligation that can run to hundreds of thousands or millions of pounds for large incidents.

Regulatory prosecution. Operating a waste management site without the required permit, or operating in breach of permit conditions (including storage limits and fire management requirements), is a criminal offence under the Environmental Protection Act 1990. Maximum penalties include unlimited fines and custodial sentences.

Third-party claims. Neighbouring businesses and residents affected by smoke, particulates, odour, or water contamination from a tyre fire may have civil claims against the site operator. Large tyre fires affecting surrounding areas have generated significant civil litigation in addition to regulatory enforcement.

Director liability. Where a company commits environmental offences, directors and senior managers who consented to or connived in the offence, or where the offence was attributable to their neglect, can be personally prosecuted alongside the company. Environmental liability does not stop at the corporate veil for serious breaches.

Duty of care liability for tyre generators. Businesses that hand tyres to an unauthorised collector, which then creates an illegal stockpile, may face duty of care liability if they cannot demonstrate they took reasonable steps to verify the collector’s authorisation. The requirement to check waste carrier licences and maintain waste transfer notes is the practical protection against this exposure.

How On-Site Processing Equipment Reduces Stockpile Risk

The most effective risk management approach for businesses generating significant tyre volumes is to minimise the on-site tyre stockpile through processing that converts stored tyres into processed products with shorter storage requirements and more controlled storage conditions.

A tyre retailer generating 500 tyres per week that stores tyres unprocessed for monthly collection has a continuously growing stockpile between collection events. The same retailer with a Gradeall MKII tyre baler on-site converts loose tyres into PAS 108 bales that are collected by civil engineering contractors as a product rather than waste. The bale storage footprint and volume is dramatically smaller than the equivalent loose tyre stockpile, the bales are denser and less susceptible to ignition than loose tyres, and the collection frequency may be higher as a commercial product than as a waste collection.

The fire risk reduction from converting loose tyre stockpiles to baled tyre product is significant. A properly wrapped PAS 108 bale is more compact, has less exposed rubber surface per unit volume than loose tyres, and the geotextile wrapping provides some fire retardant effect. More importantly, a processing operation that regularly produces and dispatches bales never allows a large loose tyre accumulation to develop.

For operations generating truck or OTR tyres, Gradeall’s sidewall cutting equipment including the truck tyre sidewall cutter and OTR tyre sidewall cutter reduces large tyres to sections that are more compact, easier to handle, and faster to process through collection by licensed contractors. Reducing tyre volume through sidewall cutting reduces the physical stockpile accumulation between collection events.

“The businesses that face stockpile risk problems are almost always the ones that have let the tyre accumulation run ahead of their collection arrangements,” says Conor Murphy, Director of Gradeall International. “Processing equipment that produces a product rather than storing waste fundamentally changes the risk profile. You’re not accumulating a hazard; you’re building up a saleable output waiting for collection.”

Contact Gradeall International for tyre processing equipment that reduces stockpile accumulation and the associated fire, environmental, and regulatory risks.

Frequently Asked Questions

At what tyre volume does my storage require an environmental permit?

In England, storage of more than 40,000 used tyres (or the weight equivalent) requires a full environmental permit from the Environment Agency. Below this level, storage may qualify for a registered exemption. SEPA in Scotland, NRW in Wales, and NIEA in Northern Ireland administer equivalent requirements with potentially different specific thresholds. Confirm the current thresholds and exemption conditions with the relevant regulator for your jurisdiction.

What should I do if I discover an illegal tyre stockpile on my land?

Contact the Environment Agency (or relevant devolved regulator) to report the stockpile. Do not move or disturb the tyres without regulatory guidance, as movement can spread any contamination. If the stockpile was created by a previous occupant or by fly-tipping, the site owner may still face remediation obligations; take legal advice on your specific liability position before taking any action.

Does my business premises insurance cover tyre fire incidents?

Check your policy wording specifically. Some commercial property policies exclude fire damage associated with waste storage or tyre stockpiles, particularly if the storage was not disclosed to the insurer. Contact your insurer or broker to confirm your coverage and to ensure your tyre storage arrangements are fully disclosed. Additional premium or specific endorsements may be needed to cover tyre storage risks.

How close to other buildings can I legally store tyres?

The Environment Agency’s guidance recommends minimum separation distances between tyre stockpiles and property boundaries, buildings, and drainage features. The specific distances depend on stockpile size and the nature of the adjacent features. Consult the Environment Agency’s tyre storage guidance for current recommended distances and confirm whether your specific arrangements require regulatory approval.