Allerton are the premier off mains drainage company covering sales, servicing, commissioning and repairs of all types of septic tanks, sewage treatment plant, sewage pump stations and soakaways.

We will:

  • Save you money.
  • Maintain your compliance with regulators.
  • Help you protect the environment.
  • Extend the life of your system.
  • Delight you.

Contact us and we will be happy to make a site visit free of charge. Or you can simply discuss issues with any of our knowledgable staff in the office.

COVID-19 - Please note that while we are making site visits, we will not enter the house. We would, however, appreciate a bucket of warm water, soap, and a towel to wash our hands. 


Contact our office to buy yours today!

£6 each*

Allerton Ground Water Tube Sketch Plan

The ideal solution for measuring your soakaway (drainage field) water levels.

Allerton Ground Water Tube

Learn more here.

*2 for £10, 3 for £14 (all prices include UK postage but exclude VAT)

Excellent service and attitude from staff

Mr B (Sewage treatment plant service and repair)

Many thanks for your kind and cheerful service

Mrs Potts (Sewage Treatment Plant Service)

A fantastic experience from quote to completion & considerably cheaper than competition

Mr Stokes, Surfleet (ConSept - New Installation)


We do specialised pump stations for awkward situations!

Need something very small, very shallow, or narrow? Need the inlet at the top? We can do that for you! Whatever your unique specification requirements, Allerton can accommodate!

Bempton Cliffs Sewage Treatment Diagram
(Jon said - 
has been replaced by a bloody big klargester
Serviced by a local firm. Dawson
We didn’t get a chance to quote.
I think!
Maybe we did. Either way I can’t write the blog. Actually I can if I keep it general. Or mention the name Rspb
Why can’t I?
Need to re-write so it's informative and truthful)
In the year of 2010 the RSPB contacted Allerton for advice on how to solve their sewage problem. They wanted install a very unusual septic tank.
  The purpose was to treat the effluent from the visitor centre which was attracting more and more visitors each year
The existing Septic tank had come to the end of its life, as septic tank systems do.
The pipe between the centre and the ST was long so installing a Sewage Treatment Plant was not an option due to noise and cost.
  The soakaway was not permitted to be parallel to the surface as it is with most systems, it had to soak into the limestone cliffs in consideration of nesting birds and their fledglings.
The plan was to install two concrete tanks and to then direct the water down two 250mm diameter bore holes approximately 6 metres deep
A steel sleeve was employed to ensure the effluent went into the limestone, rather than the top soil
Solids were collected in the bottom of the concrete chambers but the dirty water found its way into the rock by rising up in the tank and then entering the steel tubes a metre above the bottom of the tanks
The whole Job was carried out by Allerton at the optimum time of the year, that is when the birds had flown the nest!
This system lasted until the visitor numbers overwhelmed the design flow of the soakaway.
A Klargester Biodisc was then installed by Leo Dawson, a local Sewage Treatment company.

In 2011 the RSPB  at Bemton contacted Jon Allerton with a view to increasing the capacity of the septic tanks already there on the clifftop.
The Society planned to increase the size of the visitor centre and therefore needed greater capacity for the sewage treatment system.
They could not use a modern service treatment plant because any noise especially at nesting time might deter the birds from nesting.
The plan was to add to the existing septic tank system by installing a pair of deep boreholes 200mm diameter and 8m deep
Drillcorp were employed to bore the holes and Allerton constructed chambers using concrete rings.
A steel sleeve was fitted to prevent the treated effluent from infiltrating the clay layer in order to keep the surface free of pollution
The area was stripped of the topsoil and stored.
The risings or spoil, a mixture of chalk and clay, was spread over the area and the topsoil replaced
Within months, the site was as it was before and the new improved visitor centre was opened to visitors