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Spill Control: The Complete Guide

Spill control is, or should be, a key focus of any industrial site’s health and safety and environmental policies. Whether you’re new to the world of spill control, or you simply need updating on current best practices and available products, we’ve written this guide to provide you with everything you need to know.


  • What is spill control?
  • What Spill control regulations are in place?
  • Spill prevention
  • How to conduct a spill management risk assessment
  • Drip trays: how and where should you use them?
  • Spill pallets: what are they and when should you use one?
  • Cleaning oil spills
  • What to do if you spill petrol or diesel
  • How do spill kits work?


What is spill control?

Spill control is centred around reducing the likelihood and effects of a potentially hazardous spill in the workplace. This can involve any fluid that is likely to cause harm, either to workers or to the environment, including oils, fuels, chemicals and acids.

To minimise the risk of the spill, there are guidelines in place to ensure that storage best practices are adopted, and to manage the effects of a spill there are multiple products available designed to limit the spread and to effect a fast and safe clean-up and disposal.

What Spill Control Regulations are in place?

There are a lot of regulations around storing, transporting and using chemicals. Specific rules exist for different liquids, different site types and different hazard levels. Spilling paint indoors is a very different hazard to spilling acid outdoors near the water table — and the rules are therefore quite different.

The vast majority of the general guidelines can be found under either the COSHH (Control of Substances Hazardous to Health) 2002 or COMAH (Control of Major Accident Hazards) 2015 regulations.


COSHH requires business owners and employers to control any substances with the potential to be hazardous to health. The law was updated and brought into force in 2002.

Most industrial workplaces will use some kind of chemicals, fuels, oils or other substances at some point — whether it is part of the production process, refuelling heavy machinery, or in maintenance or cleaning activities. These substances need to be carefully managed and controlled to ensure that the risks of harm to personnel or the environment are minimised.

Specifically relating to spill control measures, the regulations advise that operators, owners and managers need to provide control measures to reduce harm to health and keep all control measures in good working order.


These regulations came into force on the 1st of June, 2015, replacing the previous rule set that had been in place since 1999. The summary provided by the Health and Safety Executive for COMAH is:

‘Take all necessary measures to prevent major accidents involving dangerous substances. Limit the consequences to people and the environment of any major accidents which do occur."

These guidelines, as you can see, are targeted more towards potential large-scale accidents like the Chevron Pembroke Refinery explosion and the Union Carbide Bhopal disaster.

Any organisation that has the potential, however unlikely, of a major accident occurring, needs to pay particular attention to these guidelines — if the worst does come to pass, owners, operators and managers can and will be prosecuted if they cannot clearly demonstrate that they were operating within the rules.

The full COMAH regulations and guidance can be found on the HSE website at COMAH - Guidance (hse.gov.uk).

Always be sure to check any locally enforceable regulations as well as site or chemical-specific rules and guidelines. The HSE provides guidelines specific to a number of different industries, an index of which can be found here.

If in doubt, get in touch with a health and safety or COSHH professional. The rules for chemical storage at offshore facilities are a different entity to onshore sites and can be found here.

Spill prevention

Good quality, well-thought-out storage is a vitally important part of your spill prevention strategy. Make sure that chemicals are stored securely and with diligent attention paid to safety at every turn.

Chemical storage cabinets should always be used to store smaller volumes of potentially hazardous liquids— they are made from steel, lockable, clearly marked and include lipped shelves and sumps to prevent any spills or leaks from leaving the cabinet.

COSHH compliant storage cabinet

Larger volume containers, such as oil drums or fuel tanks, should be placed on a bunded pallet, making sure that all spillage is collected and contained safely before it can enter the environment.

Similar solutions exist for generators and plant machinery that is used outdoors (construction sites, outdoor events etc) ensuring that diesel or petrol isn’t able to pass into the ecosystem or present an increased risk of fire.

How to conduct a spill management risk assessment

The first step in any spill management or response activity is the risk assessment. This will give you a detailed breakdown of where your chemicals are, what kind there are, in what volumes, and what you need to put in place in terms of products, procedures and training.

Risk assessments are legally mandated under the Management of Health and Safety at Work Regulations, 1999. These dictate that, at a minimum, employers must do the following:

  • Identify anything within the business that has the potential to cause injury or illness
  • Assess the likelihood of that risk causing any harm, and to what extent
  • Eliminate or control the risk

Conducting a spill management risk assessment doesn’t need to be complicated — but it does need to be as thorough and as accurate as possible.


Identifying potential risks can be daunting — after all, combining human error with machine or equipment malfunction can produce an almost limitless number of things that could go wrong. Your responsibility is to identify likely risks, so you can break this procedure down to a more manageable activity.

Consider how your staff work, how machinery and equipment are used and how they interact with each other. Detail exactly what types of chemicals are used, where and how they are stored, how they can react with each other and how they are used. Review any potentially unsafe practices, and make use of any accident or injury logs you keep to identify what kind of issues have arisen in the past.


Here is where you assess the level of the risk— what is the probability of an issue arising, and if it does arise, what is the likely outcome? A leaky fuel tank right next to a welding station would present an extremely high likelihood of an accident with a catastrophic outcome, whereas a relatively inert cleaning fluid kept on a high shelf presents a reasonably good chance of an accident but with little associated danger.

Look at what the impacts would be of a complete spill — so if you keep 250 litres of a chemical on-site, what would happen if the full load was spilt? From there, look at what measures are already in place to mitigate the risks (storage procedures, for example). Then, assess what else needs to be done to ensure the risk of a hazardous spill is completely minimised.


This is where you put into action all you’ve identified so far. If you are storing or using chemicals on-site, it’s likely you are doing so for a reason — you need them for your business — so it’s unlikely you’ll be able to completely eliminate any spill risks.

Controlling these risks doesn’t need to be difficult, though. Ensure you are up to date with storage best practices, and make every endeavour to not only implement, but monitor and train staff on these guidelines as well.

Drip trays: how and where should you use them?

Spill trays, or drip trays, are a great way of preventing a leak or spill from becoming a hazard. Basic drip trays consist of a rigid frame supporting an empty container to simply store the spilled liquid, whereas more advanced models will contain absorbent pads and water drainage features.

Drip tray

Due to the fact that drip trays are fairly small and easy to move around as needed, you should look at using one whenever you are decanting chemicals from bulk to smaller storage, or otherwise transferring liquids between containers.

This is one of the most common times that a spill can occur, and drip trays represent a cost-effective, easy-to-use and fast way of mitigating the risks. Additionally, consider using a drip tray for small volume storage where a dedicated chemical storage cabinet is not available/appropriate.

Spill pallets: what are they and when should you use one?

A spill pallet is essentially a much larger version of a spill tray. They are built to hold oil and fuel drums as well as IBCs intermediate bulk containers (IBCs) and can collect and store large quantities of spilled fluids. These pallets comprise a supporting grid that holds the container, a layer of absorbents to soak up any leaks quickly, and a frame to hold the whole thing together.

Spill pallets should always be able to absorb and retain more liquid than the volume of the largest container kept upon it. UK government guidance requires that a bund used for an oil storage container must be able to hold 110% of the capacity of the container.

Bunded spill pallet

Any time or place that you are storing large volumes of chemicals or fuels, typically in drums or in IBCs, best practice dictates that you should use a bunded spill pallet.

Cleaning oil spills

Cleaning oil spills can be tricky — whether it’s hydraulic oil, engine oil, lubricating oil or even cooking oils. These substances can be particularly hazardous, as they can present an increased slip risk as well as a fire risk, in addition to ruining your floor if allowed to stain and destroying ecosystems if they reach a drain or water source.

There are two main types of spill kits designed for use against oils:

Oil and fuel spill kits. These contain absorbent pads and rolls that are made out of hydrophobic materials. This means that they actively repel water, absorbing only the hydrocarbons (ie the fuels and oils). Particularly useful in outdoor or damp environments, these absorbents are also used to make more advanced types of drip tray used for generators and fuel cans, as they will not become saturated with rainwater.

Universal spill kits. These are a more generic spill kit. They can be used for solvents and water, as well as oil and fuels. Because they also absorb water, these are less useful in outdoor or damp environments as they can become quickly saturated with water and thus become less effective against the oil spill.

Oil spill kit and contents

What to do if you spill petrol or diesel

Petrol and diesel present significant health and safety risks when spilled. They make the floor extremely slippery, which increases the likelihood of injury through falling.

They are extremely flammable and any fires resulting can be difficult to contain and extinguish without the proper equipment and training. Environmentally speaking, petroleum products can contaminate drinking water, kill aquatic wildlife and make it very difficult to treat sewage. As a result, and due to the fact that petrol and diesel are some of the more common liquid chemicals found in industrial environments, special care needs to be taken.

Similar to oil spills, you’ll want to use hydrophobic socks and pads. This will allow you to clean the maximum amount of the spill in the shortest amount of time. Make sure to keep sufficient quantities of absorbents, and if your site is large or fuels are used or stored in different locations, be sure to keep several smaller spill kits spaced around.

Petrol and diesel have a lower viscosity than oils (meaning that the spill will spread much faster) so you need to be able to respond as quickly as possible.

Use the smaller kits nearest the spill to stop the spread and then supplement as necessary from elsewhere on site. As with any chemical spill, be sure to dispose of the saturated absorbents carefully and safely.

How do spill kits work?

A good quality spill kit will contain everything you need to contain and clean up the spilled liquid. They are designed to be used effectively with little to no training and can be deployed very quickly in the event of a hazardous spill emergency.

At a minimum, a standard spill kit will contain:

  • Absorbent socks to build a wall around the spill and prevent it from spreading
  • Absorbent pads to soak up the spill
  • Disposal bags for the safe and clean disposal of the saturated absorbents

More advanced kits might include equipment specific to the type of spill — a paint spill kit, for example, might include a tray for the paint can and scrapers to deal with the very viscous fluid. To learn more about the types of spill kits and how they work, read our article titled How do Spill Kits Work.