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Sewage Treatment Plant Installation

Fixing issues with soakaway

Home /Case studies/Stp installation
Mon, 22 Dec 2025

We were contacted by a client experiencing issues with their soakaway, and after discussing the problem, Jody walked the client through the available options in detail.

Together, it was decided that upgrading the existing septic tank to a modern sewer treatment plant, along with installing a new drainfield, would be the best long-term solution. To ensure the new system would work effectively, we carried out percolation testing on the soil. This test allowed us to confirm the ground was suitable for the drainage system and calculate the size of the soakaway required. After the test results were in, we provided the client with a detailed quote, which they were happy to accept. Our office team then handled the necessary paperwork, including submitting a building control notice to the local council, and coordinated the delivery of all required materials and equipment to meet the project’s start date.

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Sewage Treatment Plants Installed

Location

Devizes, Wiltshire

Problem

The old septic tank and drainfield had reached the end of their usable life. We arranged a free site visit to assess the situation, where Jody walked the client through the available options in detail.

Solution

To ensure the new system would work effectively, we carried out percolation testing on the soil. This test allowed us to confirm the ground was suitable for the drainage system and calculate the size of the soakaway required. After the test results were in, we provided the client with a detailed quote, which they were happy to accept. Our office team then handled the necessary paperwork, including submitting a building control notice to the local council, and coordinated the delivery of all required materials and equipment to meet the project’s start date.

How Did We Safely Replace and Install a New Septic System?

See what one of our Directors,Jody Jeanes, has to say.

With the tank securely in position, we proceeded to concrete it into place, ensuring stability and durability. A suction tanker was brought in to safely decommission the old septic tank which then allowed us to make the necessary connections for the new system. We then installed the new drainage field using a 100mm PVC perforated pipe grid. To do this we started by laying a 150mm bed of stone for the new pipes to rest on which was followed by an additional 200mm of stone to cover the grid. To protect the system from root intrusion, the entire setup was encased in a root-proof membrane. Once complete, the area was carefully reinstated with topsoil, leaving the site neat and tidy with no trace of the extensive work that we had carried out.

Jody Jeanes
Jody Jeanes Director – West Country Drainage Services

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