Application to Connect to a Public Sewer

(Sec 106 Water Industry Act 1991)

325050 A-DEVSRV-S106

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Connection to the public sewerage system– guidance notes and technical specification
These notes have been compiled to provide assistance and background information for persons wishing to make a connection to a public sewer within the Southern Water region.
This application is for the purpose of approval to permit communication to be made to the public sewer, under S106 of the Water Industry Act 1991. This approval is to the means and mode of construction. It does not confirm that capacity is available for the proposed development in the public sewer network.

From the 1st April 2017, Construction companies in England and Wales will have the choice of where they purchase their commercial wastewater services from. Where those companies require sewer connections for commercial purposes, be that temporary building connections, sheltered accommodation, student accommodation or business premises, they need to contact the market retailer of their choice. A list of the retailers can be found here

For all other sewer connections please refer to Developer Services. If there is a site with both domestic and commercial elements, then the sewer connection for the domestic elements will need to be applied for through Developer Services and the connections for the commercial element through the market retailer of the developer’s choice.

For billing purposes Developers will need to advise us of the market retailer of their choice, or be allocated one by us as a default. This means that if the developer has not selected their retailer within 8 working days of the connection being made, this will default to the retailer that Ofwat will select on their behalf.
The application procedure
Read these guidance notes and technical specification which will provide guidance on the materials and workmanship required to meet Southern Water standards. Additional information is contained in the latest Sewers for Adoption which is published by the Water Research Centre and available from

Complete the online application form and return it to the address shown at the end of these notes together with the relevant fee, planning consent and drawings.

Southern Water will give its decision on your proposal within 21 days. You must not programme your works to commence within this period. Failure to include any of the requested information or payment will be deemed as an incomplete application and may result in your application being delayed/ returned.

At least two working days before intending to carry out the works, you or your contractor should contact the Assistant Project Manager as shown on the approval letter to arrange a mutually convenient inspection date. Every effort will be made by Southern Water to meet your required inspection date providing that the two days notice has been given.
What does it cost?
A vetting and administration charge plus VAT, as per the application form, is levied for each sewer connection whether made directly onto a public sewer or indirectly via an existing lateral or private sewer and is based on the type of connection.

An Infrastructure Charge is also applicable to first time connections – upon connection to the public sewerage system, or a sewer or drain which drains to the public sewerage system. An infrastructure charge for sewerage is levied on each dwelling served by the connected sewer. For the current infrastructure charges please refer to Southern Water’s website at

Non domestic premises will be individually assessed according to the number of appliances/fittings producing wastewater. (VAT is zero rated for new domestic property connection to the sewerage system). Infrastructure charges are applicable even if the connection is made via a private sewer providing that the private sewer ultimately discharges into the public system.

Note that these costs do not cover the cost of laying the drain from your property to the sewer or making the connection.
Technical requirements
Where a connection is to be made that serves three or more properties, and in other cases at the discretion of Southern Water, the connection to the public sewer shall be made via an access point (manhole/inspection chamber).

New manhole construction must be in accordance with the typical manhole details shown in Sewers for Adoption. All materials used should comply with those specified in the current edition of Civil Engineering Specification for the Water Industry and comply with the appropriate current British and/or European Standard.

Vitrified clay pipes and pipeline fittings should comply with the relevant provisions of current British and/or European standards, for pipes with flexible mechanical joints.

Unreinforced or reinforced concrete pipes and fittings with flexible joints shall comply with the relevant provisions of current British and/or European standards.

Ductile iron pipe fittings and joints shall comply with the relevant provisions of British and/or European standards.

Sulphate resisting Portland cement or a special combination of GGBS or PFA shall be used in all cases (including precast concrete products) unless the contractor can show that any attack from soils, groundwater or aggressive atmospheres in the existing sewers will be adequately resisted by use of cement to current British and/or European standards.

The relevant proportion of M1 mortar mix shall consist of one part sulphate resisting cement to three parts of sand by volume. Mortar which has begun to set or which has been mixed for a period more than one hour shall not be used.
Connection of gravity drains to a manhole
Where a connection is to be made using a pipe of the same internal diameter as the outlet pipe from the manhole, the connection shall be made at the invert of the main channel.

Where the connection is to be made using a pipe of smaller diameter than the outlet pipe from the manhole, the connection should be made so that the soffits of the connection and outlet pipes are level.

Pipework entering a manhole shall have an external flexible joint within 600mm of the inside face of the manhole connection and a rocker pipe not more than 600mm long to the main pipeline, in accordance with the typical detail in the current issue of Sewers for Adoption.

In certain circumstances Southern Water will consider the use of vertical external backdrop connections. A typical detail showing the approved arrangement is shown in the current issue of Sewers for Adoption . Internal backdrop connections will not be permitted, except with the express permission of Southern Water.

45-degree ramped connections may be substituted for a backdrop. In such cases an oblique junction and a 45-degree bend shall be substituted for the tumbling bay junction and the 90-degree rest bend respectively.

All other construction details shall be as for the external backdrop connection.

The ramped connection on a private drain or sewer will not form part of the public sewerage system.
Connections of rising mains (pumped drainage) pipework to manholes
Such a connection will only be permitted if a manhole is constructed at the point of discharge (irrespective of the number of properties connecting).

A manhole and short length of gravity pipework will normally be required between the rising main and the public sewer. If the length of gravity sewer is not required, then a Viking- Johnson or similar approved coupling shall be installed within 600mm of the external face of the manhole. The connection level requirements of the rising mains shall be the same as those for gravity drains.
Arrangement of pipework within manholes
Pipework of 100mm to 300mm internal diameter and of a smaller diameter than the main outlet sewer shall terminate with a half section, clay branch channel bend. The angle of the connecting pipework at the point of entry through the manhole wall shall not be less than 90-degrees relative to the direction of flow in the main sewer at the point of exit from the manhole.

Where connecting pipework is in the range of 100mm to 300mm internal diameters and of the same diameter as the outlet sewer, a 45-degree to 90-degree channel junction shall be inserted. Approval must be sought for any alternative proposal.

For connecting pipework greater than 300mm internal diameter the branch channel bend shall be formed from class C20 concrete and rendered with granolithic concrete. The connecting angle shall be as above.
Connecting to an existing sewer pipe
The branch connection shall discharge its contents obliquely and in the direction of flow in the existing sewer. The oblique angle should be between 45 and 55 degrees in order that standard pipework fittings can be utilised.
Type of entry (including Saddle connections)
Branch connection to a sewer of 225mm internal diameter or less, should be made by inserting a new oblique angled junction pipe using Bandseal/Flexseal couplings or similar approved.

When inserting a new junction, the existing section of pipe shall be removed by cutting the pipes to square ends using a method or system approved by the pipe manufacturer. Cracked pipes must be replaced and the line, level and existing flows maintained at all times.

Splay cut connections may be made to sewers with an internal diameter in excess of 450mm where oblique junctions may not be available. Where a splay cut connection is to be made the pipes shall be cut to ensure an oblique entry so that discharge is in the direction of flow in the main sewer. The connecting pipework shall be cut to ensure that its socket rests on the outside barrel of the sewer and that there is no projection inside the main sewer. The pipes should then be pointed in cement mortar both internally and externally.

The ends of connections not intended for immediate use shall be closed with a purpose made stopper. The location of all such joints shall be recorded by the contractor by measurement from the manhole immediately downstream and notified to the SW Assistant Project Manager prior to backfilling being carried out.

Oblique angled saddle connections may be used on sewers with internal diameters greater than 225mm and less or equal to 450mm provided that the internal diameter of the connecting pipework is less than a third of the public sewer.

Pipe saddles for concrete or clay sewers shall be bedded in Class M1 cement mortar and a cement mortar fillet formed to give at least 50mm cover to the base of the saddle. Pipe saddles for uPVC sewer pipes shall be purpose made from uPVC and fixed using the appropriate solvent cement as per the manufacturers instructions. The connecting pipe should not protrude into the sewer.

Saddle connections will not be permitted on brick, pitch fibre or twin walled plastic (or ribbed) sewers.
Access to connecting pipework
Where the connection is not to be made via an existing or new manhole, the requirement under building regulations to provide an inspection chamber or manhole within 12.5m of the point of connection should be observed.

When connecting to an existing lateral drain, an inspection chamber or manhole would normally be required at the head of the lateral drain.
It is not our normal practice to test any part of the drain or private sewer to be connected. However, we reserve the right to do so if there appears to be a risk of infiltration as a result of high ground water levels. Should we wish to carry out any tests upon the connecting pipework then the contractor shall provide all facilities and testing apparatus on site.

The test, which should be carried out prior to backfilling the trench, shall be in accordance with the air test specified in BS 8005. Failure to pass the test will not preclude acceptance of the connection if a successful water test (as also specified in BS8005) can subsequently be carried out.
Maintenance of flow
The contractor shall be responsible for maintaining the flow in the affected public sewer during the entire course of his works. Details as to how it is proposed to do this should accompany the application or be forwarded to the Developer Services team prior to the commencement of work on site. Internal surfaces of all sewers, drains, manholes or culverts etc shall be kept free of cement, bricks, soil or other superfluous matter.
Health and safety
All the contractor’s staff shall be suitably trained in relation to entry into confined spaces.

The contractor shall provide and adequately maintain in full working order at all times approved gas detectors and emergency escape sets, one set per person, when present in or near confined spaces. Contractor’s staff must be fully conversant with this equipment, its use and operation.

I refer you to the Southern Water Health and Safety Advisory, which can be viewed in the Developer and Builders section of the website

No working in confined spaces shall be allowed to proceed until this equipment is present and fully operational at the work site.

It shall be the contractor’s responsibility to adequately support the sides of any excavations. If in the opinion of the Assistant Project Manager the excavation is not adequately supported, the contractor shall take all the necessary steps to make the trench safe at his own expense before any inspection works are carried out. Additional inspection charges will be levied if the Assistant Project Manager has to make additional site visits.

When working in the public highway, all traffic signs and barriers etc shall be provided and maintained in accordance with Chapter 8 of the Traffic Signs manual to meet the requirements of the Police and Highway Agency.
Other information
Where separate foul and surface water sewers are provided, the foul water must be directed to the foul sewers and surface water to the surface water sewers.

Please note - where such a situation exists, it will not be permitted to discharge surface water, either directly or indirectly (eg via a private sewer or drain), into the foul water sewer.

Connections to pumping mains are not permitted.

The discharge of land drainage or ground water into the public sewers is also not permitted.

The discharge of non-domestic effluent is not permitted until a valid trade effluent consent has been issued by Southern Water. Queries regarding trade effluent should be addressed to our Technical Call Centre on 0330 303 0368.

Before final approval of the connection is given it may be necessary for all or part of the contributory drains or sewers on the development to be inspected. Should this be necessary, the two days notice requirement will be applicable.

If you wish your lateral drain to be adopted by Southern Water please submit an application (S104 Adoption of a New Sewer) in accordance with the current issue of Sewers for Adoption.

You are strongly advised to avoid commencing works on Fridays and weekends as any delays due to unforeseen circumstances will be compounded by the difficulty of obtaining additional fittings etc which may result in you incurring additional costs.

All necessary preparatory work including all the obligatory road signing and guarding shall be carried out and/or is in place prior to the inspection taking place.

Before any opening is made in the carriageway, footpath or verge a road opening notice must be obtained from the appropriate Highway Authority. All requests for information regarding the associated costs, procedures and timescales should be addressed to them.

You can find out where the public sewers are in your area by writing to:

Southern Water
Southern House
Yeoman Road
West Sussex
BN13 3NX

Telephone with 0330 303 0276 (Lines open 8am-5pm Monday to Friday)

Please state the property address and address to which the plan should be sent. For more information including the current charges payable please refer to our website:

Alternatively, in accordance with the Water Industry Act (1991), members of the public may view the public sewer and water maps at our Chatham office between 10am and 3pm, Monday to Friday. Please contact the LandSearch team on 0330 303 0276 or email to arrange an appointment.

Contact details:

Contact details:

Please check your site is in the Southern Water catchment area:

Details of proposed connection
Diameter (mm): *
Details of proposed connection
Diameter (mm)
square metres
Details of proposed connection
Diameter (mm)
square metres
  • Copies of the drainage layout plan at 1:100 (or larger), showing location of sewers and manholes on site and up to the connection point
  • Copy of planning consent
  • Site location plan at 1:1250 (or larger)

  • Site boundary clearly shown
  • Roads clearly shown
  • Adjacent buildings clearly shown
  • Private pipe run to Southern Water network clearly shown
  • Maximum file limit is 50MB
  • Allowed file types are DOCX, DOC, PDF, XLS, XLSX, JPG, JPEG, BMP, PNG, DWG (auto cad), DXF (auto cad), DGN (microstation), PRP (microstation), PRW (microstation)
Warning! File size too big. Maximum file size 50MB.
Terms and conditions
If the application has been made by the client/agent and not the contractor who will be undertaking the work, the client/agent is obliged to ensure that the contractor is familiar with the terms of approval and in particular the requirement to give reasonable notice of the intention to commence work on site

Connection to the Public Sewerage System – PAYMENT SLIP

Connection Type Number Required Cost per connection Total Cost
New manhole 355.00 (inc. 20% VAT)
Any other type of connection as listed in section E 277.00 (inc. 20% VAT)
Amount to pay
S106 Connect to a Public Sewer
VAT (20%)
Total Fee
Do you require a VAT receipt?
Preferred payment method:
Application number:
Amount to pay: £

Payments can be made directly via BACS transfer to:

Southern Water Services Ltd
Miscellaneous Income Account
HSBC Bank Plc
P O Box 125, 2nd Floor, 62-76 Park Street,
SE1 9DZ, London, England

Sort Code - 40-02-50
Account No - 81426834

(However please ensure that you confirm the application number you are making payment for in the reference line)

Please make cheques payable to Southern Water Services Ltd.
Your printed slip and cheque should then be sent to:

Miscellaneous Income
Southern Water
PO Box 4056
BN13 3XX

Please click on ‘Print Preview’ and confirm your cheque number is on the preview slip.
Please print the slip and attach the cheque after writing the application number on the back in case they are separated.

Please ensure that you have included the following items with this application:

Failure to complete this application in full and provide relevant information will result in the application being returned and/or refused.

By signing this application you are not automatically granted permission to connect.

Under no circumstances must any person enter the public sewerage system without the express permission of Southern Water.

I confirm to the best of my knowledge the information I have supplied I complete and correct.