How to Clean Up Hydraulic Oil & Diesel Spills on Construction Sites
Be Ready for Spills, Big or Small!
A burst hydraulic hose, a leaking excavator or a diesel spill during refuelling. It’s all part of working with heavy machinery, but dealing with the aftermath isn’t quite so straightforward.
Beyond the mess, oil and fuel spills can create slip hazards, contaminate surrounding ground and potentially enter nearby drainage systems.
Whether you’re managing a busy construction site, maintaining a fleet of plant machinery or working as a mobile engineer, knowing how to respond to a spill is essential.
Fortunately, with the right equipment and a clear response plan, many small spills can be contained and cleaned up before they become bigger problems.
Here’s what you need to know.
Why Are Hydraulic Oil and Diesel Spills a Problem?
Leaks and spills can occur during routine maintenance, refuelling or unexpected equipment failures. Even relatively small quantities of oil can cause environmental damage if they reach soil, surface water drains or nearby watercourses. According to the Environment Agency’s pollution prevention guidance, businesses should assess pollution risks and take appropriate measures to prevent spills and contaminated run off from entering the environment. This makes effective spill control an important part of everyday site management.
How to Clean Up a Hydraulic Oil or Diesel Spill in 6 Steps
If you discover a spill, acting quickly is important. However, always assess the situation before attempting to clean it up.
These steps apply to smaller spills that canbe managed safely. Large spills, uncontrolled leaks or incidents involving significant fire or environmental risks may require specialist assistance.
1. Identify the Spill and Make the Area Safe
First, establish what has been spilled and where it’s coming from.
If safe to do so, stop the machinery, isolate the leaking equipment or shut off the fuel supply.
Keep unnecessary personnel away from the affected area and eliminate potential ignition sources, particularly when dealing with diesel.
Wear suitable personal protective equipment (PPE) and follow your site’s risk assessment and the substance’s safety data sheet.
2. Stop the Spill from Spreading
Before cleaning up the liquid, prevent it from travelling further.
Use absorbent socks or booms to create a barrier around the spill, paying particular attention to nearby drains, gullies and exposed ground.
The Health and Safety Executive’s spill control guidance identifies absorbent pads, booms and temporary barriers as useful methods of containing hazardous substances.
Remember: Containment comes before cleanup. Preventing a spill from reaching drainage systems can significantly reduce its environmental impact.
3. Apply Suitable Absorbent Materials
Once the spill is contained, use an appropriate absorbent to collect the liquid.
Different spill control products serve different purposes:
| Spill control product | Best used for |
|---|---|
| Absorbent granules | Smaller spills on hard surfaces, including concrete and workshop floors |
| Absorbent pads | Soaking up oil and fuel on machinery, floors and equipment |
| Absorbent socks | Surrounding spills and preventing liquids from spreading |
| Absorbent booms | Containing larger spills and protecting vulnerable areas |
| Drain covers | Preventing liquids from entering drainage systems |
| Spill kits | Providing multiple absorbent products in one accessible pack |
Choosing the right absorbent depends on the liquid involved, the surface affected and the size of the spill.
For example, loose absorbent granules can be particularly useful for dealing with oil on uneven hardstanding, while absorbent pads may be more convenient for wiping down machinery.
Explore our range of oil spill absorbent granules.
4. Allow the Absorbent to Work
Follow the manufacturer’s instructions for application and contact time.
For granules, distribute the recommended quantity across the affected area and allow sufficient time for the liquid to be absorbed.
Avoid spreading the contamination beyond the original spill.
If necessary, apply additional absorbent until the free liquid has been collected.
5. Collect and Dispose of Contaminated Materials
Once the liquid has been absorbed, carefully collect the used granules, pads or other contaminated materials.
Place them into suitable containers or disposal bags and arrange disposal through an authorised waste contractor.
Don’t put oil-contaminated absorbents into general waste bins.
GOV.UK’s waste management guidance states that materials contaminated with oil must be managed as hazardous waste.
6. Inspect the Area and Restock Your Spill Kit
After cleanup, inspect the affected area for remaining contamination.
Check that the source of the leak has been repaired and that machinery is safe before returning it to service.
Record the incident according to your company’s procedures and replace any spill control materials used.
If a spill has caused, or threatens to cause, environmental pollution, follow your reporting procedures. In England, environmental incidents can be reported to the Environment Agency on 0800 80 70 60.
Are All Oil Absorbent Granules the Same?
Not quite!
Traditional clay granules are widely used for oil spill cleanup, but lightweight alternatives can offer practical advantages, particularly for businesses transporting spill control equipment between sites.
One example is ISOL8 Oil Spill Absorbent Granules, available from HTS Spares.
Designed for absorbing oils, fuels and other compatible liquids, ISOL8 offers several useful features:
- High absorbency: Advertised as absorbing up to three times more than traditional clay granules.
- Lightweight: The 1.3kg pack is convenient for mobile engineers and service vehicles.
- Non-leaching properties: Designed to help retain absorbed contaminants.
- Versatile: Suitable for hydraulic oil, diesel, petrol, grease and other specified liquids.
- UK manufactured: Produced in the United Kingdom.
For plant hire companies and maintenance teams regularly travelling between jobs, lightweight absorbents can be a convenient addition to their spill response equipment.
Discover ISOL8 absorbent granules at HTS Spares.
What Should Be in a Construction Site Spill Kit?
Having absorbent materials available is important, but being properly prepared means having the right equipment for the risks present.
A construction site spill kit will typically include a combination of absorbent pads, socks, disposal bags and other containment materials.
The appropriate kit depends on the type of liquids handled, potential spill volumes and the working environment.
For example, a mobile plant engineer may need a compact kit that fits inside a service van, while a busy workshop or construction depot may require greater absorbency capacity.
HTS Spares stocks a range of spill kits for construction and plant maintenance, helping businesses prepare for unexpected leaks and spillages.
November Spill Control Offers
To help businesses prepare for unexpected spills, HTS Spares is offering up to 30% off selected spill kits throughout November, alongside three specially created Holworx® spill control bundles.
| Spill control bundle | November price | Saving |
|---|---|---|
| Van & Machine Spill Control Pack | £87.95 | £42.66 |
| Workshop Spill Control Pack | £154.95 | £70.99 |
| Site & Depot Spill Control Pack | £201.75 | £95.81 |
Whether you’re maintaining machinery on the move or managing a busy depot, explore our spill control range to find equipment suited to your working environment.
Offers available during November 2026 on selected products.
Be Prepared Before the Next Spill
Hydraulic oil and diesel spills aren’t always predictable, but your response can be.
Regular machinery inspections, appropriate fuel handling procedures and readily accessible spill control equipment can all help reduce the risks associated with leaks and spillages.
The key is preparation. Make sure your team understands the correct response procedures and has access to suitable absorbents before an incident occurs.
Need to restock your spill control equipment?
Explore the HTS Spares spill kit range and discover our November offers.
Frequently Asked Questions
What is the best absorbent for hydraulic oil spills?
Oil-compatible absorbent granules, pads and socks can all be effective. The best choice depends on the spill size, location and surface.
Can absorbent granules clean up diesel?
Yes, provided the granules are specifically suitable for diesel and other hydrocarbon liquids. Always check the manufacturer’s instructions.
Can you wash hydraulic oil down a drain?
No. Oil-contaminated water must not be allowed to enter surface water drains or watercourses. Contain the spill and arrange appropriate cleanup and disposal.
How often should construction site spill kits be checked?
Spill kits should be inspected regularly and replenished after use. Checks should form part of the site’s routine safety and environmental procedures.
