Commercial Kitchen Grease Traps - Legal Requirements

Understanding Your Legal Duties for Fats, Oils, and Grease (FOG)

Many small business owners are taken by surprise when they learn that grease trap rules aren’t just for big industrial kitchens. Compliance around commercial kitchen grease traps – legal requirements – is simple: if your kitchen produces fats, oils, and grease (known as FOG), you must stop it from going down the drain.

This applies to all food service outlets, including cafes, pubs, and takeaways. Understanding your role in FOG management is the first step to protecting your drains, the local sewers, and your business from fines.

For over 20 years, the Drainflow team has been the first call for emergency drain clearance across Bedfordshire, Buckinghamshire, and Hertfordshire. So, we’ve seen firsthand how an absence of FOG management can be for a small commercial kitchen. That hands-on experience puts us in the perfect position to offer practical, no-nonsense advice to help you get it right from the start.

What Happens When FOG Goes Down the Drain?

The Drainflow team can tell you exactly what happens to fat, oil and grease once it leaves your sink, because we see its horrible outcome on a regular basis. As FOG travels down your pipes, it cools, solidifies and clings to the pipe walls. This sticky stuff traps other waste, creating bad-smelling, stubborn blockages that can cause drains to back up into your kitchen. For your business, this may mean closures and emergency call-out fees.

What Happens When FOG Goes Down the Drain?

If we take a wider perspective on this and imagine the FOG from all the kitchens in the local area combining in the public sewers, we arrive at “fatbergs,” those nasty agglomerations that are capable of blocking entire systems and causing pollution in local waterways.

A simple, well-maintained grease trap is a bit of a hero in this scenario. It collects the FOG before it gets into your drainage system, acting to protect both your business and your local sewage system.

Understanding the Law (and How to Avoid a Heavy Fine)

There’s a reason why the regulations around FOG are strict — it’s to prevent blockages that potentially affect everyone. For a small café or takeaway, knowing your exact duties is important to your livelihood. Here is a simple summary:

Your Legal Duties:

  • Primary Responsibility (Water Industry Act 1991) – Do not allow FOG to enter the public sewer system. It is a criminal offence to do so.
  • Waste Management (Environmental Protection Act 1990) – You must manage all your waste, including FOG, responsibly. This includes keeping records of the cleaning and disposal of FOG waste, which must be carried out by a licensed waste carrier.
  • Equipment – You must have an effective system, like a grease trap, installed to prevent FOG from passing into the drainage system.

Potential Penalties:

  • Fines – Prosecution can lead to large fines imposed by the courts.
  • Recharge Costs – Your local water authority can charge you the full cost of clearing any blockages and repairing any damage caused by your business.

Grease Trap Maintenance – Keeping it Working Effectively

A grease trap works by separating FOG from your wastewater. But once its caught, it needs to be removed on a regular basis. Maintaining your grease trap isn’t just a suggestion—it’s essential for the trap to keep being effective and for you to remain compliant. An unmaintained trap is as bad as not having one at all.

How Often to Clean Your Grease Trap

This depends on the size of your kitchen and how busy it is, but an appropriate schedule needs to be calculated.

  • Busy cafes and restaurants – Every 1-2 months.
  • Small businesses without a high footfall – Every 3-4 months.

What a Full Maintenance Clean Includes

A complete clean is needed to maintain effectiveness over the long term. This is what our maintenance process involves:

  1. Emptying – All water, FOG, and solids are removed from the trap.
  2. Cleaning – The trap’s interior walls and baffles are scraped clean.
  3. Inspecting – A check is done to make sure the trap is not damaged.
  4. Disposing – The FOG waste is legally and safely removed.

Five Simple Kitchen Habits That Make a Big Difference

The less fat, oil, and grease you allow down the drain, the better, that’s why we’re suggesting you drum these 5 habits into your staff as they will reduce the strain on your grease trap and lower the risk of blockages.

FOG Prevention Checklist:

  1. Scrape It – Scrape all food scraps from plates and pans into the bin.
  2. Strain It – Use metal strainers in your sinks to catch any solids.
  3. Store It – Collect all your waste cooking oil in a secure container for professional collection. Do not pour it down the sink.
  4. Wipe It – Use disposable towels to wipe away grease from surfaces and cookware before washing.
  5. Teach It – Keep reminding your staff (till they’re sick of hearing about it) that only water should go down the drain.

How Drainflow Can Help Your Kitchen

FOG management protects your business from fines, floods, and really bad smells. Drainflow can help to keep it working effectively. We provide a complete, professional service to ensure your drains remain clear. We support commercial kitchens of every size, from initial grease trap installation to ongoing maintenance and fast emergency callouts.

Call Drainflow today to find out more about our FOG management services or to get a quick, no obligation quote – 01525 718500

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