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Treatment Plant Servicing & Repairs in Haslemere

Treatment plants looked after every year, and repaired when they fail, at homes and estates in the protected countryside around Haslemere.

Haslemere sits between two protected landscapes. The Surrey Hills National Landscape covers the hills to the north, and the South Downs National Park starts just to the south, taking in Blackdown and much of the country around Fernhurst. Building or replacing drainage in either takes care, and the Environment Agency’s rules apply on top of planning.

Many plants here serve large houses set in their own woodland, rebuilt homes on old hillside plots, and properties that have outgrown an old septic tank. On steep sites the plant may have a pump to send treated water up or across the slope, which adds another part that needs checking. Plants under trees also collect leaves and roots around the lids and vents, which can starve the blower of air.

Our engineers service treatment plants across the Haslemere area, clean and test the blower, diffusers and pumps, and leave a written report. Desludging can be done by our tanker on the same visit. We work to the maker’s schedule for each plant.

What's included

What we check at a service

The parts that keep a plant treating properly, and the ones that tend to fail.

  • Outfall and drainage field

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

  • Baffles and pipework

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

  • Pumps and floats

    Any pumps are run and tested, and floats are checked to make sure they move freely.

  • Lid and access

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

  • Sludge levels measured

    We measure the sludge and arrange desludging when it’s due, often on the same visit.

  • Blower and air supply

    We check the blower is running correctly and that air is reaching the diffusers, because that’s what keeps the bacteria working.

Keeping your plant working

01
A Clearmasters service van at a customer’s property

Headwater streams with little to dilute them

The south branch of the River Wey rises on the northern slopes of Blackdown, and the land east of the town drains to the River Arun. Near their sources these are small streams, often only a trickle in summer. Treated water from a plant makes up a big share of the flow, so a plant that isn’t working shows up quickly.

The General Binding Rules expect every plant that discharges to a stream to be serviced as the maker recommends. On a headwater, that yearly service matters even more. We check the outlet and the water leaving the plant every time.

Learn more
02
A Clearmasters service van

All the main makes

We service and repair the common makes found on homes and small sites, including Klargester, Conder, Marsh, Graf, Tricel and WPL Diamond. If you’re not sure what you have, a photo of the lid or the panel usually tells us.

If parts for an old plant are no longer made, we’ll explain the options honestly.

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Local to you

Treatment plant servicing around Haslemere

We service treatment plants in and around Haslemere, including Hindhead, Beacon Hill, Grayswood and Churt in Surrey, Fernhurst, Linchmere, Hammer and the Blackdown slopes in West Sussex, and Grayshott, Liphook and Bramshott in Hampshire. Big houses tucked into the woods are no problem. See the full Haslemere area list.

Other services in Haslemere

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

From 134 reviews · Read them
4.9/5

Google

From 63 reviews · Read them

Scores as of October 2026

★★★★★

Clearmasters Ltd did a great job of servicing and emptying our sewage treatment plant. The team turned up on time, were very polite, efficient and gave me lots of advice on maintenance. The office team are extremely helpful also. I'd thoroughly recommend them.

Checkatrade review Checkatrade · GU10
★★★★★

Came out within an hour on an emergency call out. Great service. Fast reliable reasonable prices. Highly Recommended

Peter D. Google review
Read all our reviews

Free, no-obligation quote

Book a treatment plant service in Haslemere

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

Your treatment plant questions answered

We’re near Blackdown, in the South Downs National Park. Can we replace our septic tank?

Yes, but plan early. A new system in the National Park needs to meet the Environment Agency’s rules and may need planning permission from the park authority. A treatment plant is the usual replacement where the outlet goes to a stream. We can survey what you have first.

Can I take over a plant when I buy a house?

Yes, and it’s worth booking a service soon after you move in, so you know its condition and get a fresh service record. Ask the seller for any manuals and past records too.

My treatment plant alarm is going off. What should I do?

Cut your water use right down and call us. Don’t switch the plant off unless it’s unsafe. Most alarms mean a blower, pump or float has failed, and we can usually find the fault on the first visit.

Our plant near Hindhead pumps treated water uphill. Does that need servicing too?

Yes. The pump, its float and the high-level alarm should all be checked at every service. If that pump fails, treated water backs up in the plant and can flood the chamber. We test the whole system, not just the tank, and bring the usual spare parts.

Do you service my make of plant?

We service and repair the common makes, including Klargester, Conder, Marsh, Graf, Tricel and WPL Diamond. If you’re not sure what you have, send a photo of the lid or panel when you get in touch.

How often should a treatment plant be serviced?

Most domestic plants should be serviced at least once a year, and some makers recommend every six months. Your plant’s manual will say, or we can tell you when we see 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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