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Sewage Treatment Plant Servicing in East Horsley

Servicing and repairs for treatment plants at homes, farms and conversions around the Horsleys and the Wey valley villages.

Much of the land around East Horsley has long belonged to estates and farms, and when their outbuildings or lodges become homes, the sewer is rarely close enough to reach. A packaged treatment plant is often the answer, and you’ll find them at conversions, replacement houses and rural properties between the downs and the Wey.

North of the villages, water runs off the London Clay towards the River Wey, which flows past Ockham and Ripley. Where the clay won’t take a drainage field, a plant may discharge to a stream or ditch instead. That’s allowed under the General Binding Rules, but only if the plant is properly maintained and desludged before it gets too full. Owners are expected to show they’ve done both.

We service treatment plants across the area, from single household units to larger plants shared by a few homes. Our engineers carry the common spares, and we keep a record of each visit. If you’re buying a house with a plant, those records are well worth asking the seller for.

What's included

What our engineers look at

Each visit follows a full checklist and ends with a written record.

  • Wear parts spotted early

    Worn diaphragms, noisy bearings and tired pumps are flagged before they fail.

  • The final effluent

    We look at what’s leaving the plant, which is a quick guide to whether it’s treating properly.

  • Outfall and drainage field

    We look at where the treated water goes, so problems with the outlet or drainage field are picked up early.

  • A written service record

    You get a record of the visit and our advice, handy for your files or when you sell the property.

  • Baffles and pipework

    We check the baffles, inlet and outlet are clear and undamaged, so waste moves through the chambers properly.

  • Lid and access

    The lid, seals and fixings are checked so the plant stays safe and watertight.

Repairs and desludging

01
A Clearmasters service van

The Surrey Hills and the Wey valley

The wooded downs above the Horsleys, including Sheepleas, are part of the Surrey Hills National Landscape. If you need to replace an old septic tank up there, or put in a new treatment plant, talk to Guildford Borough Council about planning before any work starts.

Down in the Wey valley around Ripley and Send, the ground is lower and wetter, and a plant close to the river or its streams can be caught by flooding. If water has been over the lids, have the blower and control panel tested before the plant goes back into normal use.

Learn more
02
A Clearmasters tanker emptying a tank at a rural property

Desludging

Every treatment plant builds up sludge, and it needs removing before it goes beyond what the plant can hold, usually at least once a year. Leave it too long and solids can carry over into the final chamber and out to your drainage field or watercourse.

We can desludge on the same visit as your service, using our own tankers.

Learn more

Local to you

Treatment plant servicing around East Horsley

Our engineers service treatment plants in Ripley, Send, Send Marsh, Ockham, Wisley, Hatchford, Effingham, Effingham Junction, East Clandon and both Horsleys, for single homes, farms and small groups of houses sharing one plant. Annual contracts and one-off visits are both fine. See the full East Horsley area list.

Other services in East Horsley

We look after the whole system, not just one part of it.

Related services

Call 03333 233566

What our customers say

9.84/10

Checkatrade

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4.9/5

Google

From 63 reviews · Read them

Scores as of October 2026

★★★★★

Excellent service from start to finish. The guys turned up on time and completed the job really quickly and efficiently. Highly recommended.

Checkatrade review Checkatrade · KT24
★★★★★

Great service, as ever...been using Clearmasters for 8 years now, very professional, reliable and have sorted blockages and camera inspection for problems in the past.

Checkatrade review Checkatrade · KT24
★★★★★

Pleasure to deal with this company. The are efficient and competitively priced

Checkatrade review Checkatrade · GU4
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Free, no-obligation quote

Book a treatment plant service in East Horsley

Let us know your plant’s make and any warning lights or smells, and we’ll quote and book an engineer.

  • Free quotes for servicing and repairs
  • Engineers carry the most common parts
  • Emergency call-outs 24/7
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Questions answered

Treatment plant questions

Can my treatment plant near Ockham discharge to a stream?

Yes, if it meets the General Binding Rules, which include keeping the plant maintained and desludged on time. On the London Clay around Ockham a drainage field often struggles, so a stream or ditch can be the practical choice. A septic tank on its own is not allowed to discharge to a watercourse.

Does the blower need to run all the time?

On most plants, yes. The blower keeps air flowing to the bacteria that treat the waste. If it stops for long, the plant stops treating properly and can start to smell.

Is servicing a legal requirement?

If your plant discharges to the ground or a watercourse, the General Binding Rules say it must be maintained by someone competent in line with the manufacturer’s instructions. Regular servicing is the simplest way to show that.

Will a new plant near Sheepleas need planning permission?

Possibly. The downs above the Horsleys are in the Surrey Hills National Landscape, where planning is stricter. Check with Guildford Borough Council first, and make sure the design meets the Environment Agency’s rules or that you have a permit for the discharge.

Do you install new treatment plants?

Yes. If your old plant or septic tank needs replacing, we can quote for a new treatment plant and, if needed, a new drainage field.

My plant smells. What does that mean?

A healthy plant shouldn’t smell much. A strong smell often means the blower has stopped and the bacteria have died off, or the sludge is overdue for removal. Call us and we’ll check it.

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.

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