Flood water, pump stations and drains handled on the Thames floodplain, and septic tanks looked after in the villages around Chertsey.
Chertsey is an old riverside town on the Thames floodplain, surrounded by flooded gravel pits, river meadows and the M25. Much of the town and its neighbours, Addlestone and Thorpe, sit on low gravel terraces where groundwater rises close to the surface in wet winters. When the Thames is high, water has nowhere to go.
That shapes a lot of our work here: pumping out flooded basements, chambers and car parks, servicing the pump stations that low-lying homes and sites depend on, and clearing drains blocked with silt. Out towards Lyne, Longcross and parts of Thorpe and Ottershaw, some homes are off the mains on septic tanks, cesspits and treatment plants.
Our crews are in Runnymede most days and we answer the phone 24 hours a day, 365 days a year.
When the Thames is high or groundwater rises, basements, cellars, chambers and car parks can flood. Our tankers pump the water out and take it away, and we give you honest advice on what will help while levels are still high.
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On low ground, many homes and sites rely on pumps to move waste and water. We service them before winter, test the pumps and alarms, and respond 24/7 if one fails.
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Silt from floods and slow-moving water on flat ground cause blockages. We clear drains with high-pressure jetting and survey them with CCTV to check for damage.
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Around Lyne, Longcross and parts of Thorpe and Ottershaw, some homes are off the mains. We empty septic tanks and cesspits and service treatment plants. In wet winters, high groundwater can affect these systems too.
Learn moreLocal knowledge
Life on the Thames floodplain.
The gravels around Chertsey hold water. In very wet winters, groundwater can rise into basements, chambers and tanks and stay there for weeks.
When the Thames is high, low-lying streets can flood and drains back up. Clear drains and working pumps help.
Septic tanks and cesspits can fill with groundwater in wet winters. Emptying gives temporary relief but won’t stop it until levels drop.
Local to you
We cover Chertsey and the towns and villages of Runnymede.
Chertsey · and neighbouring areas
Surrounding areas · including homes on septic tanks
If you’re in or around Chertsey, we cover you. Call with your postcode and we’ll confirm.
Why Chertsey customers use us
Whether it’s a flooded basement in Chertsey or a cesspit in Lyne, here’s what you can expect.
Emergency call-outs 24 hours a day, 365 days a year, with a real person answering the phone.
Tankers from 2,000 to 4,000 gallons, jet/vac combination units, CCTV survey kit and confined space teams for pump station wet wells.
Tanks, treatment plants, pump stations, grease traps and drains, all handled by one team.
A waste transfer note with every collection, and a written report after surveys and services.
We’ve been emptying tanks and servicing systems since long before most of the kit on the market existed.
Our engineers and most of our tanker drivers hold current confined space entry certificates, and the engineers carry the most common parts.
Checkatrade
From 134 reviews · Read them
From 63 reviews · Read them
Scores as of September 2026
★★★★★Clearmasters have emptied our Septic Tank for many years. It is not an easy placed tank to get to but the chaps manage perfectly. I find them very efficient, friendly and polite. Thank you Valerie Wise
Valerie W. Google review
★★★★★So glad we found them. The team was professional, courteous and helpful. They came the next day and pricing is way more competitive than a national chain. Will be using them again in a year's time to service the pump. Thanks again!
★★★★★We've been using Clearmasters for several years now and they've been great. We're in a tricky area to get to but they always make a plan without complaint. Great team! Highly Recommended.
How it works
The same simple process for every job.
Step 1
Call us or book online and tell us what’s happening. If there’s flooding, tell us where the water is and how deep, roughly.
Step 2
We send a tanker, a jetting van or an engineer. It helps if:
Step 3
You get a waste transfer note for anything we take away, and a written report after a survey or service. If it’s a regular job, we’ll remind you when the next one is due.
Free, no-obligation quote
Tell us what you need and we’ll come back with a price. If you’re flooding now, call us instead.
Questions answered
What homeowners and businesses around Chertsey ask us most.
We can pump it out and take it away. If groundwater is still high, it may come back until levels drop. A working sump pump with an alarm is the best long-term protection.
High groundwater can get into cesspits and tanks through joints and cracks. When levels drop, we can inspect it and advise on sealing or replacing it.
Ideally before winter, so it’s ready for the wettest months. Most need servicing at least once a year.
Yes. We empty septic tanks and cesspits and service treatment plants for homes off the mains around Chertsey.
Yes. We jet out silt and debris and can survey the drains afterwards to make sure there’s no damage.
Yes. We answer the phone 24 hours a day, 365 days a year. Call 03333 233566.
Got a different question? Call 03333 233566 or send us a message.
We're independently vetted and certified so you can trust who you're letting onto your site.
Health & safety pre-qualification accreditation, verifying our processes meet recognised safety standards.
Railway Industry Supplier Qualification Scheme — approved to work safely within the rail industry supply chain.
Utilities Vetting Database membership, confirming we meet the utilities sector's supply chain standards.
Vetted and approved under the local authority's trusted trader scheme for honesty and fair dealing.
Members of the National Association of Drainage Contractors, the UK trade body for the drainage industry.
Registered with the Environment Agency, so your waste is handled and disposed of fully within the law.
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