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Based in the West Midlands, we carry out the maintenance, service and repair of oil separators also known as grease traps and grease interceptors. We also provide services for bypass separators, full retention separators, forecourt separators, washdown & silt separators.

At Cotterill Environmental, we're renowned for our excellent customer service and specialist expertise when it comes to wastewater solutions.

Oil separator service

Oil separators are designed to separate fats, oils and grease (FOGs) from wastewater to prevent blockages and contamination. They are installed underground, often near catering establishments or food processing facilities.


Without the use of an oil separator, FOGs can build up in the system, and cause significant damage.


Over time, they create something called a ‘fatberg’, which can block the system entirely, causing wastewater to back up and prevent commercial kitchens from functioning properly. 


Our maintenance service includes:

  • Removal, checking and cleaning of pumps

  • Checking the pipework is in good condition

  • Testing the pumps 

  • Checking control panel

  • On-site service and repair

  • Refurbishment of your current equipment

Oil separator repairs

Our specialist engineers can also undertake breakdown call-outs and repairs. We carry an extensive stock of spare parts so we can fix your system quickly and efficiently.


Signs that your oil separator may need repairs include:


  • A bad smell coming from the area where the oil separator is located may indicate that food waste has accumulated and is decomposing in the tank. This will indicate that you need a profession to assess it. 

  • Slow drainage of water is another key indicator

  • Water begins to backup or overflow from drains


Our specialists will conduct a thorough inspection of your oil separator tank and advise on the most effective way to fix any problems.

​Contact us today for expert advice!​

Benefits of our service package

Peace of mind

Get peace of mind that your system is maintained correctly and minimise the risk of unexpected breakdowns and nasty odours!

Service report provided

We provide you with a service report after each visit to let you know how the tank is functioning and include detailed photos.

Prolong your system

An oil separator is a big cost outlay. Prolong the life of your system and ensure you get the best return from your investment.

Reminders so you don't forget

It's easy to forget so we will send you reminders when your service is due, providing you with even more peace of mind.

Meet your legal requirements

Regular maintenance ensures your system is compliant. It's a legal requirement to ensure your system isn't polluting the environment.

Fast repairs when needed

Most repairs are done during a service or breakdown call out as we keep a record of your system and carry spare parts for your system with us.

Why use us?


Top rated customer service

We’ve built up a reputation for being friendly, professional and 100% reliable. You can count on us for excellent service.


We know our stuff

 Our 30 year proven track record of installing wastewater solutions speaks for itself. We're specialists when it comes to the installation, maintenance and repair of sewage systems



Integrity and honesty are core to what we do. We're a family-owned business and are known for being trustworthy and hard working.

            Contact us today for advice 

            0121 461 4861 

Useful information on oil separators


Here are some frequently asked questions about why the maintenance of oil separators:

What is an oil separator?

An oil separator tank, also known as a grease trap, is a device used to remove oil, grease, and fats from wastewater before it is discharged into the sewer system. These tanks are commonly found in catering industries where oily water is generated as a result of cooking processes.


An oil separator tank works on the basis of a difference in density between oil and water. When wastewater enters the tank, it undergoes a separation process where the oil and grease float to the surface due to their lower density, while heavier solids settle at the bottom. The separated oil and grease are then skimmed off the surface, and the clarified water is discharged.


Regular maintenance and proper disposal of collected oil and grease are essential to ensure the efficient operation of the separator and compliance with environmental regulations.

Why is it important to service your oil separator?

There are many practical and environmental benefits to installing an oil separator, including:


  • Avoids kitchen breakdowns - this allows commercial facilities to operate efficiently, and prevent downtime which may result in a loss of business 

  • Regular maintenance will extend the lifespan of the tank, meaning you get a better return on your investment. 

  • Peace of mind - regular servicing will give you reassurance that everything is working as it should be, which will reduce the risk of costly breakdowns and repairs. 

  • By having your oil separator serviced regularly, it ensures that the manufacturer’s warranty is upheld

How often should you service your oil separator?

We recommend having your oil separator serviced at least every 3 - 6 to ensure it is functioning properly. This allows for any maintenance or repairs to take place, and gives peace of mind that the tank is performing as it should be for optimal use.

What areas do we cover?

We cover the whole of the midlands and can also work further afield depending on the drainage project. Areas in the midlands that we cover include: 

Birmingham (West Midlands), Coventry (West Midlands), Hereford (Herefordshire), Lichfield (Staffordshire), Stoke-on-Trent Staffordshire), Wolverhampton (West Midlands), Worcester (Worcestershire), Shrewsbury (Shropshire), Warwick (Warwickshire), Derby (Derbyshire), Leicester(Leicestershire), Oakham (Rutland), Lincoln (Lincolnshire), Nottingham (Nottinghamshire), Buxton(Derbyshire), Glossop (Derbyshire), Cleethorpes (Lincolnshire), Northampton (Northamptonshire) 

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