CLEARMASTERS
Our crews work in London most days. South London, from Sutton and Streatham to Wimbledon and Kingston, is a short drive from our office in Smallfield, and our tankers and engineers cover the whole capital, out to the Essex and Surrey borders.
London drainage is mostly about keeping old, busy drains flowing. Central London is restaurants, hotels and basements. The inner suburbs are Victorian terraces split into flats, with shared drains. The outer suburbs are inter-war semis on London Clay, with roots and cracked pipes. New towers at Stratford, Battersea, Wembley and Barking Riverside depend on pump stations, and the industrial riverside and Lea valley need interceptors. On the green-belt edge, around Upminster, Stanmore, Epping and Brentwood, there are still plenty of septic tanks.
Every area below has its own page explaining what we see there. Wherever you are, you get the same team, the same paperwork and the same 24-hour phone line.
Our services in London
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Septic Tank & Cesspit Emptying
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Treatment Plant Servicing
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Pump Station Servicing
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Blocked Drains & CCTV Surveys
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Grease Traps & Commercial Waste
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Gullies & Interceptors
Learn moremost days
call-outs
fleet
businesses
notes
Local knowledge
What drainage looks like in London
Old drains, busy kitchens, deep basements and a green-belt edge.
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Restaurants and hotels
From the West End to Brixton, Peckham and Ilford, fat is the biggest cause of blocked drains. Grease traps need emptying before they fill.
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Basements below the sewer
In Kensington, Westminster, Richmond and Wimbledon, basements rely on pumps that need servicing and a working alarm.
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Shared drains
Since 2011, most shared drains and sewers have been the water company’s responsibility. The section serving only your property is usually yours.
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London Clay
Across north, west and outer London, clay shrinks and swells with the seasons, cracking old drains, and trees make it worse.
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New towers and estates
Stratford, Battersea, Wembley, Woolwich and Barking Riverside are full of new buildings with pump stations that need planned maintenance.
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The green-belt edge
Around Upminster, Romford, Stanmore, Epping and Brentwood, many homes and farms still rely on septic tanks and cesspits.
Local to you
Towns we cover in London
Every town below has its own page, and we cover the villages around each one.
- Barking
- Battersea
- Bexleyheath
- Brentwood
- Brixton
- Chingford
- Cricklewood
- Ealing
- Edmonton
- Epping
- Finchley
- Finsbury Park
- Greater London
- Greenwich
- Hampton Court
- Harrow
- Heathrow
- Hounslow
- Ilford
- Kensington
- Kingston upon Thames
- Lewisham
- Notting Hill
- Peckham
- Richmond
- Romford
- Stanmore
- Stratford
- Streatham
- Sutton
- Tottenham
- Twickenham
- Upminster
- Walthamstow
- Walton-on-Thames
- Wembley
- Westminster
- Wimbledon
- Wood Green
- Woodford
- Woolwich
What our customers say
Checkatrade
From 134 reviews · Read them
From 63 reviews · Read them
Scores as of September 2026
★★★★★Clearmasters have been emptying and servicing our treatment plant for the last 7 years and their service and quality of work is of a high standard. I would highly recommend them.
Angus C. Google review
★★★★★Efficient, courteous, customer-facing. Would not hesitate to recommend to others.
★★★★★I've used Clearmasters for at least 10 years and always find them reliable, helpful, knowledgable and great at what is a really unpleasant job! I won't use anyone else.
Not sure if we cover you?
If you’re anywhere in London, we cover you. Call with your postcode and we’ll confirm.
Neighbouring areas
Questions answered
London septic tank and drainage FAQs
Do you cover the whole of London?
Yes. Our crews work across London most days, and we also cover the Essex and Surrey edges, including Epping, Brentwood and Walton-on-Thames.
Who is responsible for a blocked shared drain?
Since October 2011, most shared drains and sewers have been the water company’s responsibility. The section serving only your property is usually yours. We can find the blockage and tell you which it is.
Do you service basement pumps?
Yes. We service and repair basement pump stations across London and respond 24/7 if one fails.
Are there really septic tanks in London?
Yes, on the green-belt edges, around Upminster, Romford, Stanmore, Chingford and Bexley, and just beyond in Epping and Brentwood.
Do you offer contracts for organisations with several London sites?
Yes. See our Greater London page, or call us to talk through a planned maintenance schedule.
Got a different question? Call 03333 233566 or send us a message.
Fully accredited & compliant
We're independently vetted and certified so you can trust who you're letting onto your site.
SafeContractor
Health & safety pre-qualification accreditation, verifying our processes meet recognised safety standards.
RISQS
Railway Industry Supplier Qualification Scheme — approved to work safely within the rail industry supply chain.
Achilles UVDB
Utilities Vetting Database membership, confirming we meet the utilities sector's supply chain standards.
Trading Standards Approved
Vetted and approved under the local authority's trusted trader scheme for honesty and fair dealing.
NADC Member
Members of the National Association of Drainage Contractors, the UK trade body for the drainage industry.
Registered Waste Carrier
Registered with the Environment Agency, so your waste is handled and disposed of fully within the law.