Septic tanks, cesspits, treatment plants and drains looked after for homes, farms and businesses in Alton and the east Hampshire villages around it.
Alton itself is on mains drainage, but a lot of the countryside around it isn’t. Villages like Medstead, Lasham, Bentworth and Selborne, and the farms and houses along the lanes between them, rely on septic tanks, cesspits and treatment plants. That’s most of what we’re asked to do around Alton.
The high ground around Four Marks and Medstead is chalk with a cap of clay and flints, which can be slow to drain. In the river valleys the ground is lower and wetter. So when a tank seems to fill quickly or the drains slow down after rain, the cause isn’t always the tank: it may be the drainage field or the ground around it.
The town also has pubs, restaurants and food businesses that need grease traps emptying and drains cleared. Our tankers and engineers are out in this part of Hampshire most days, and we’re available 24 hours a day, 365 days a year when something goes wrong.
We empty septic tanks and cesspits at homes and farms around Alton with tankers that hold 2,000 to 4,000 gallons. While we’re there we check the tank’s condition and the outlet, and tell you if anything needs attention. If you have a cesspit, we can set up regular collections so it never gets close to overflowing.
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Treatment plants have moving parts that wear out. A yearly service keeps the blower, diffusers and pumps working and the water it lets out clean. Our engineers service the common makes, carry the most common parts, and repair plants when an alarm goes off or the plant stops working properly.
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From period houses in the town centre to newer estates on the edge of Alton, we clear blocked drains with high-pressure jetting. If a drain blocks again and again, a CCTV survey shows you why, so any repair is aimed at the actual problem rather than guesswork.
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Pubs, restaurants and takeaways in Alton need their grease traps emptied regularly or fat sets hard in the drains. We empty traps on a schedule that suits how busy your kitchen is, and leave a waste transfer note every time.
Learn moreLocal knowledge
A few things about the ground and the area that affect septic tanks and drains here.
On the high ground around Four Marks and Medstead, a layer of clay and flints sits on the chalk. It can drain slowly, so drainage fields may struggle after long spells of rain.
The River Wey rises near Alton. A septic tank that discharges into a ditch, stream or river must be upgraded under the General Binding Rules.
Many properties are down narrow lanes or long drives. Telling us about access in advance means we bring the right tanker and a long enough hose.
Local to you
From the town out to the villages of east Hampshire, here’s where we work around Alton.
Alton · town and nearby
Surrounding villages · where septic tanks and cesspits are common
If you’re anywhere around Alton, call with your postcode and we’ll tell you when we can get to you.
Why Alton customers use us
Whether it’s a cesspit at a farm near Lasham or a grease trap in the town centre, here’s what you can expect.
We’ve been emptying tanks and servicing systems since long before most of the kit on the market existed.
Tanks, treatment plants, pump stations, grease traps and drains, all handled by one team.
Our engineers and most of our tanker drivers hold current confined space entry certificates, and the engineers carry the most common parts.
A waste transfer note with every collection, and a written report after surveys and services.
Regular customers get a reminder when their next empty or service is due.
Tankers from 2,000 to 4,000 gallons, jet/vac combination units, CCTV survey kit and confined space teams for pump station wet wells.
Checkatrade
From 134 reviews · Read them
From 63 reviews · Read them
Scores as of September 2026
★★★★★Turned up on time, cleared the blockage with little fuss and the lads who turned up were professional throughout
Chloe R. Google review
★★★★★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.
★★★★★Efficient, courteous, customer-facing. Would not hesitate to recommend to others.
How it works
The same simple process whether it’s a tank, a treatment plant or a blocked drain.
Step 1
Call us or book online and tell us what you need. If you’re not sure what kind of system you have, tell us what you can see and we’ll help you work it out.
Step 2
We book a date that suits you and send the right vehicle for the job. 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, whether it’s a one-off empty, a service or a regular contract. If something’s overflowing, call us now instead.
Questions answered
The questions homeowners and businesses around Alton ask us most often.
Most household tanks need emptying about once a year. Slow toilets, gurgling drains or smells near the tank are signs it may be overdue. After the first empty we can tell you how quickly yours fills and remind you when the next one is due.
Around Alton, the clay over the chalk can drain slowly, especially after a long wet spell. A drainage field that’s waterlogged may also be clogged with solids from a tank that hasn’t been emptied often enough. We can empty the tank and check what’s happening at the outlet.
Yes. Our engineers service treatment plants and repair them when they go wrong, and our tankers empty the sludge. We can do both on one visit.
Yes. We’ll suggest how often your trap needs emptying based on its size and how busy you are, and give you a waste transfer note each time for your records.
Ask what type of system it is, where it discharges and when it was last emptied. A septic tank survey before you exchange gives you a clear picture and tells you whether it meets the General Binding Rules.
Our crews work in east Hampshire most days, so Alton is well within reach. In an emergency, call 03333 233566 day or night and we’ll give you a time.
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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