Shropshire Drainage
Preparing to repair a blocked field drain

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Soakaway Installation & Repair in Shropshire

Percolation testing, drainage field design, and installation or repair of soakaways for septic tanks and treatment plants.

Photo: Chris Morgan · CC BY-SA 2.0

The soakaway, properly called a drainage field when it serves a septic tank or treatment plant, is where your system finally hands the water back to the ground. It is also the component that fails most expensively, because a clogged or collapsed drainage field usually means excavation and fresh land.

Soakaway performance is decided by the soil. Free-draining sandy or loamy ground takes water readily; heavy clay barely takes it at all. Large parts of Shropshire, particularly across the north of the county, sit on glacial clays where percolation is poor, and that has to be respected in the design. A drainage field built without a proper percolation test is a drainage field built on hope.

We test the ground to BS 6297, design drainage fields sized to your household and your soil, and install them with the right pipework, aggregate and separation from watercourses and boundaries. We also investigate and repair existing soakaways that have slowed or failed, and we will tell you plainly when repair is worthwhile and when replacement is the honest answer.

What the service includes

  • Percolation tests to BS 6297 with written results
  • Drainage field design sized to occupancy and measured soil performance
  • Full installation with distribution pipework and correct aggregate
  • Investigation of failed soakaways, including whether the fault is the field or the tank upstream
  • Repairs, extensions and full replacements
  • Advice on alternatives where the ground genuinely will not percolate

Failing percolation is common on Shropshire clay

When a percolation test fails, the rules do not allow a conventional drainage field. The usual answers are a sewage treatment plant discharging to a watercourse under the General Binding Rules, or an engineered solution such as a mound system. We will set out the options for your site rather than forcing a standard product on it.

Most "failed soakaways" were killed by the tank

A septic tank that has gone too long between empties lets sludge carry over into the drainage field, where it seals the soil. Regular emptying is the single cheapest thing you can do to make a soakaway last.

Where the water goes

The drainage field is the part that does the soaking away, and the part that fails when a tank has not been emptied often enough.

How a septic tank works A cross-section through a domestic septic tank. Wastewater leaves the house through an inlet pipe into the first chamber, where solids settle as sludge at the bottom and fats and grease float as a scum crust on top. The clarified liquid in the middle passes under a baffle into the second chamber, then leaves through the outlet into a drainage field of perforated pipe laid in gravel, where it soaks away into the ground.
Wastewater separates in the tank: solids sink as sludge, fats float as scum, and only the liquid layer passes to the drainage field to soak away. Sludge has to be pumped out before it reaches the outlet.

Soakaway Installation & Repair near you

We provide soakaway installation and repair throughout Shropshire. Find the detail for your area:

Frequently asked questions

How do I know my soakaway is failing?

Typical signs are waterlogged or unusually lush ground over the field, effluent surfacing, odours, and a septic tank that refills or backs up quickly after emptying. Any of these is worth investigating promptly, before winter rain makes it worse.

What is a percolation test?

A measured test of how quickly water drains from trial holes in the proposed drainage field area, carried out to BS 6297. The result determines whether a drainage field is permitted and how large it must be.

Can a soakaway be repaired rather than replaced?

Sometimes. If the problem is a crushed pipe, root ingress, or a distribution box fault, repair is realistic. If the soil itself has sealed with sludge, replacement on fresh ground is usually the only durable fix, and we will tell you which case you are in.

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