CLEARMASTERS
Blocked drains and CCTV surveys
We clear blocked drains at homes and businesses in Seaford with high-pressure jetting, and survey them with CCTV when the problem keeps coming back.
Learn moreSeaford is a quiet seaside town between Newhaven and the Seven Sisters, made up mostly of homes and bungalows on the chalk. The town is on mains drainage, so our work there is clearing and surveying drains, and keeping soakaways and surface-water drains working.
Behind the town, the Cuckmere valley and the South Downs are very different. Villages like Alfriston, Litlington, Westdean, Exceat, Friston and Bishopstone, and the farms and cottages around them, often rely on septic tanks, cesspits and treatment plants. The valley floor is wet; the Downs are chalk that feeds drinking water supplies.
Our crews work along this coast most days and we answer the phone 24 hours a day, 365 days a year.
Our Seaford drainage and waste services
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Blocked Drains & CCTV Surveys
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Septic Tank & Cesspit Emptying
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Treatment Plant Servicing
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Septic Tank Surveys
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Treatment Plant & Pump Repairs
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Grease Traps & Commercial Waste
Learn moreCovering Seaford
& villages
& villages
24/7
call-outs
call-outs
Homes &
businesses
businesses
Waste transfer
notes
notes
Own tanker
fleet
fleet
What we do for Seaford customers
Septic tanks in the Cuckmere valley
We empty septic tanks and cesspits for homes, farms and holiday lets in the valley villages, and tell you if the tank or its outlet needs attention.
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Treatment plant servicing
Treatment plants on the Downs and in the valley need servicing at least once a year to keep the water they discharge clean. Our engineers service the common makes and leave a written report.
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Surveys for buyers
Buying a cottage in the Cuckmere valley with its own drainage? A septic tank survey tells you what system it has and whether it meets the rules.
Learn moreLocal knowledge
Drainage around Seaford: what to know
A seaside town with a national park behind it.
South Downs National Park
The villages behind Seaford are in the park. New or replacement drainage may need park authority planning permission.
The Cuckmere valley
The valley floor is low and wet in winter. Drainage fields there can struggle.
Chalk soakaways
In Seaford itself, soakaways on chalk work well until they silt up.
Local to you
Areas we cover in and around Seaford
We cover Seaford and the villages of the Cuckmere valley and the Downs.
Seaford · town and nearby
- Seaford
- Bishopstone
- Chyngton
- Sutton
- East Blatchington
Surrounding villages · where private drainage is common
- Alfriston
- Litlington
- Westdean
- Exceat
- Friston
- East Dean
- Berwick
- Selmeston
- Alciston
- Norton
- Frog Firle
- Newhaven
Not sure if we cover you?
If you’re in or around Seaford, we cover you. Call with your postcode and we’ll confirm.
Nearby areas
Why Seaford customers use us
Town drains and valley tanks
Whether it’s a blocked drain in Seaford or a cesspit in Litlington, here’s what you can expect.
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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.
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Trained engineers
Our engineers and most of our tanker drivers hold current confined space entry certificates, and the engineers carry the most common parts.
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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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We remember so you don’t have to
Regular customers get a reminder when their next empty or service is due.
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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.
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
★★★★★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
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 you need. For holiday lets, tell us when the property is empty.
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Step 2
We come out and do the job
We send the right van, tanker or engineer. It helps if:
- there’s room to park a tanker close to the tank, trap or manhole
- lids, covers and hatches are clear and easy to find
- you tell us about narrow access, gates or site rules before we arrive
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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 Seaford property
Tell us what you need and we’ll come back with a price. If something’s overflowing, call us now.
- Free quotes for drains, tanks and surveys
- Septic tanks and treatment plants in the valley
- Visits timed around holiday lets
Urgent?
03333 233566
Questions answered
Seaford drainage and septic tank FAQs
What homeowners around Seaford ask us most.
Do you empty septic tanks in Alfriston and the Cuckmere valley?
Yes. Many homes and farms in the valley are off the mains, and we empty and service their systems.
Do I need permission to replace a septic tank in the national park?
You may need planning permission from the South Downs National Park Authority, and the system must meet the Environment Agency’s rules.
Why does my soakaway overflow?
Over time, silt and debris fill the gaps in the soakaway. We can jet and empty it, and tell you if it needs replacing.
Can you service our holiday let’s treatment plant between guests?
Yes. Tell us your changeover days and we’ll fit the visit in.
Can you survey the drains before I buy in Seaford?
Yes. A CCTV survey with a written report shows the condition of the drains before you commit.
Can you help in an emergency?
Yes. Our crews work along this coast most days and we answer the phone 24 hours a day. Call 03333 233566.
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.