CLEARMASTERS
Blocked drains and CCTV surveys
We clear blocked drains at homes, shops and offices with high-pressure jetting, and survey them with a camera if the problem keeps coming back. You get a written report showing what we found.
Learn moreBlackwater sits right where Hampshire, Surrey and Berkshire meet, on the river that gives it its name. It’s a small place with busy roads, retail and commercial sites all around it, and homes that are almost all on mains drainage. Most of our work here is drains, gullies and pump stations.
Being low-lying and close to the river, the area sees standing water after heavy rain. Car parks, roads and service yards rely on gullies and interceptors to carry that water away, and when they silt up, they flood. Keeping them clean is one of the simplest ways to avoid trouble.
We look after homes, shops and commercial sites across the border towns, from Hawley and Frogmore to Sandhurst and Camberley. Our crews work in this area most days and we answer the phone 24 hours a day, 365 days a year.
Our Blackwater drainage services
View all services
Blocked Drains & CCTV Surveys
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Gullies & Interceptors
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Pump Station Servicing
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Flood & Groundwater Removal
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Grease Traps & Commercial Waste
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Septic Tank Surveys
Learn moreBlackwater &
the border towns
the border towns
24/7
call-outs
call-outs
Homes, shops
& businesses
& businesses
Waste transfer
notes
notes
Jet/vac
tankers
tankers
What we do for Blackwater customers
Gullies and interceptors
Car parks, service yards and roads near the river need clean gullies and interceptors to drain properly after heavy rain. Our jet/vac tankers empty and clean them, and we can set up a regular schedule for your site.
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Pump station servicing
Low-lying sites and newer developments often rely on pump stations. We service them, test the pumps, floats and alarms, and come out day or night if one fails.
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Flood water removal
When heavy rain floods a car park, basement or chamber, our tankers can pump the water out and take it away. Afterwards we can jet and survey the drains to find out why it flooded.
Learn moreLocal knowledge
Drainage around Blackwater: what to know
Low ground by a river means drainage gets tested every winter.
Standing water
Low ground near the river can hold surface water after heavy rain. Clean gullies and drains make a real difference to how quickly it clears.
Your drain or theirs?
The drain serving only your property is usually yours; shared sewers are usually the water company’s. We can find the blockage and tell you which side of the line it’s on.
Commercial sites
Shops and commercial units with car parks should have interceptors and gullies cleaned regularly to stay compliant and avoid flooding.
Local to you
Areas we cover in and around Blackwater
We cover Blackwater and the towns around it on all three sides of the county border.
Blackwater · and neighbouring areas
- Blackwater
- Hawley
- Frogmore
- Darby Green
- Minley
Surrounding towns · homes and businesses we cover
- Yateley
- Sandhurst
- Camberley
- Frimley
- Farnborough
- College Town
- Owlsmoor
- Crowthorne
- Fleet
- Cove
- Eversley
- Bagshot
Not sure if we cover you?
If you’re in or around Blackwater, call with your postcode and we’ll confirm.
Nearby areas
Why Blackwater customers use us
Quick to help, clear about what’s wrong
Whether it’s a blocked drain at home or flooded gullies on a commercial site, here’s what you can expect.
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Day and night, all year
Emergency call-outs 24 hours a day, 365 days a year, with a real person answering the phone.
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The right kit for the job
Tankers from 2,000 to 4,000 gallons, jet/vac combination units, CCTV survey kit and confined space teams for pump station wet wells.
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Accredited for commercial sites
SafeContractor, Achilles UVDB and RISQS approved, so we can get onto managed sites and meet your contractor checks.
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Paperwork done properly
A waste transfer note with every collection, and a written report after surveys and services.
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34 years in drainage
We’ve been emptying tanks and servicing systems since long before most of the kit on the market existed.
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One call for everything
Tanks, treatment plants, pump stations, grease traps and drains, all handled by one team.
What our customers say
9.84/10
Checkatrade
From 134 reviews · Read them
4.9/5
From 63 reviews · Read them
Scores as of September 2026
★★★★★Efficient, courteous, customer-facing. Would not hesitate to recommend to others.
Jonathan O. Google review
★★★★★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.
★★★★★I have used Clearmasters now for 4 years and the service has been excellent. Very punctual on the day and their planning team have always been very helpful in finding convenient dates to service and maintain our pumps and tanks. I recommend.
How it works
What happens when you book
The same simple process for every job.
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Step 1
Tell us what you’ve got
Call us or book online and tell us what’s happening. For commercial sites, let us know about access and who to report to.
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Step 2
We come out and do the job
We send the right vehicle, from a jetting van to a jet/vac tanker. It helps if:
- there’s space to park a tanker close to the tank, trap or manhole
- covers and pump station hatches are clear and easy to find
- we know about any site induction, permit or access code in advance
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Step 3
Paperwork and the next visit
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
Get a quote for your Blackwater property
Tell us what you need and we’ll come back with a price. If something’s flooding, call us now.
- Free quotes for one-off jobs and contracts
- Drains, gullies, interceptors and pump stations
- Waste transfer notes with every collection
Urgent?
03333 233566
Questions answered
Blackwater drainage FAQs
What homeowners and businesses around Blackwater ask us most.
Why does our car park flood after heavy rain?
Usually because the gullies or interceptors are full of silt, or the drain they feed is partly blocked. Cleaning them and jetting the drain normally solves it; a CCTV survey shows if there’s damage too.
How often should gullies be cleaned?
On most commercial sites, at least once a year, and more often under trees or where there’s a lot of traffic. We can set up a schedule for your site.
Do you cover the Surrey and Berkshire side of Blackwater?
Yes. We cover the whole area, including Sandhurst, Camberley, Frimley and Crowthorne.
Can you pump out flood water?
Yes. Our tankers can remove flood water from car parks, basements and chambers, then jet and survey the drains afterwards.
Do you service pump stations?
Yes. We service pump stations for homes, developments and commercial sites, and respond 24/7 if one fails.
Are you available out of hours?
Yes. Call 03333 233566 at any time, day or night, and we’ll tell you when we can be there.
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.