Making a New Connection to Public Sewer - Services First Limited · Services First Limited
Services First Limited
Drainage Design & Engineering

Making a New Connection to Public Sewer

Application to Connect

For assistance call 0207 536 2778

Water Authorities in the main offer a usually expensive contractor service to undertake new sewer connections. The developer should arrange for a contractor to do the work, and for a Water Authorities Inspector to certify the connection on completion.

Connections to Public Sewers shall preferably be made using Methods of Connection that protect the integrity of the public sewer must be maintained at all times.

Anyone intending to make a connection to a public sewer is required by law to give the Statutory Undertaker  notice. New Connection Application Forms should be completed and submitted along with the appropriate fee (see Administration and Inspection Fees below) to:

On receipt of correctly completed form and correct fee Water Authorities will post out your “Receipt of Notice” which includes your “unique connection reference number” (see Inspection by Water Authorities Inspector below). Within the 21 day notice period Water Authorities may object (in writing) to the connection or make comment on how it should be undertaken. We therefore advise that you plan your work to allow adequate time for the 21 day notice period to elapse before proceeding with the work and arranging inspection..

When planning highway excavations you may pass a copy of your “Certificate of Connection Application” to the Local Highway Authority as proof that you have given notice to us of making the connection (see Permissions to be sought by Developer below).

Health and Safety

Sewers including manholes and trenches into which a sewer can vent are hazardous places and need special safety precautions. Your attention is drawn to the ‘Confined Space Regulations 1997’ and the document ‘Safe Working in Sewers and at Sewerage Works’ published by the National Joint Health and Safety Committee for Water Services.

Agreement to the Works by Water Authorities should not be taken as confirmation that your proposed method of working complies with these documents or represents a safe system of work.
No person should enter a manhole on the public sewerage system without having had the appropriate Confined Space entry training. They must have all necessary safety equipment and ensure that they comply with all relevant health and safety requirements.
Permissions to be Sought by Developer

Where the connection crosses any land not in the ownership of the developer, he must first seek permission to undertake the works from the landowner or the connection will be unlawful.

If the work involves excavations in the public highway (including footways and grass verges) consent from the Local Highway Authority will be required. The Local Highway Authority will require you to use a certified contractor in accordance with the New Road and Street Works Act 1991.

Discharges to Public Sewer

Drainage shall not be discharged recklessly. The necessary checks must be undertaken. Refer to statutory public sewer record map (see Locating Existing Sewers and Services below)

To avoid pollution and potential penalties, foul water shall only be disposed of to foul or combined water sewers.

Surface water shall not be disposed of to foul sewer. Disposal of surface water can have a significant impact on sewer flooding. Please refer to your Planning and Building Regulations conditions of approval (if any) and to the Hierarchy for surface water disposal as described in Building Regulations Approved Document H3 Section 2.
Administration and Inspection Fees

Water Authorities charge a fee for administration and inspection of new connections to public sewer. This is payable in advance and is not refundable. Please therefore ensure that you are actually connecting to a public sewer and not a private sewer by checking the statutory public sewer record map beforehand (see Locating Existing Sewers and Services below). Your fees cannot be refunded if it is later discovered that your connection is actually to a private sewer.

Note:
A property also becomes liable for sewerage charges when it first becomes connected to a public sewer. A sewerage infrastructure connection charge is payable at that time. This is not dealt with as part of the sewer connection application process. It is collected along with charges for new water supply. We advise that the property owner should, on receipt of their Water Authorities Utility Bill, check that sewerage charges are levied for the property along with water charges and, if not, to contact Water Authorities Billing.
Locating Existing Sewers and Services

It is the responsibility of the developer to confirm feasibility and identify existing sewer and services positions on site. This work should be undertaken by a competent contractor.

Water Authorities keep a Statutory Public Sewer Record Map. This shows the recorded position of public sewers and disposal mains together with private sewers under a Section 104 Sewer Adoption Agreement.

Each Local Authority (Council) within our area also has a copy of the Statutory Sewer Map for their district. This is available for viewing only at an office of the Local Authority.

Methods of Connection

Connection to Public Sewer Pipe by Oblique (Y-Piece) Junction

Oblique junctions shall be ‘flexible’. Rigid joints will not be permitted. Flexible couplings must comply with the requirements of the Water Industry Specification 4-41-01 ‘Specification for flexible couplings for gravity sewer and drainage pipes’. Oblique junctions shall be the same material as the existing public sewer and placed in the direction of flow at a 2 / 10 o’clock position on the existing public sewer section clock face. The connection must be at least 225mm from a collar or spigot.

Connection to Public Sewer Pipe by Saddle

The use of saddles to clay or concrete sewers is acceptable where the Public Sewer diameter is three increments larger than the connection diameter, e.g. a 300mm dia. Public Sewer can only be connected to by a 100mm dia. saddle. Saddle connection must be positioned at 10 o’clock or 2 o’clock and at an angle of 45 degrees to the direction of flow. A single hole in the Public Sewer must be made by diamond core drilling.

Saddles shall be the same material as the existing public sewer and positioned at 2/10 o’clock position on the existing sewer section clock face.
The connection must be at least 225mm from a collar or spigot.

Connection to Public Brick Sewers (Including Flat Slab Tops)

The orifice for the new connection should be made by carefully core drilling or removing bricks from the side of the sewer, preferably within the top third.
Where applicable, the top slab may be temporarily taken off to aid this process.
The connection should not be made by attempting to core drill the top slab.

Connection to Existing Public Manholes

This is not a preferred method of connection. The existing manhole may not be able to accommodate the new connection. If the existing manhole is found to be unsuitable for connection then the connection proposals will have to be revised.

If the manhole is suitable, the new pipe shall be connected in such a manner that the soffit levels of the existing and new pipes are the same. Where the existing manhole has a preformed invert, then the invert of the connection should be formed and made good in granolithic concrete as required. Pipes in manholes shall not be plastic.

If it is impractical (due to corresponding pipe levels) to connect into the existing manhole at the same soffit level as the existing public sewer, then a backdrop arrangement may be constructed outside the manhole chamber to ‘Sewers for Adoption’ 6th Edition Specification.
Internal back drops are rarely accepted. They should be ductile iron and full detail drawings and method statements must be submitted for express written approval.

Connection to Public Sewer by New Inspection Chamber

This is not preferred and is only permitted up to a depth of 2m and not in public highway.

Polypropylene inspection chambers (PPIC) or rectangular pre-cast concrete inspection chambers in accordance with attached approved list of manufacturers may be used where not in highway. Concrete surround shall be provided to inspection chamber where subject to vehicle loading (e.g. driveways). For depths in excess of 1.2m a restricted access opening of 350mm diameter (or 300x300mm square) shall be used.

Inspection chamber covers shall be ductile iron and the appropriate strength for the area situated (minimum classification B125).

Back drop connections (if applicable) shall be external and to ‘Sewers for Adoption’ 6th Edition Specification.

Connection to Public Sewer by New Manhole

This is not preferred but is acceptable for larger drainage schemes.
Manholes shall be Pre-cast concrete ring Type to ‘Sewers for Adoption’ 6th Edition Specification.
Manhole covers shall be ductile iron and appropriate strength for the area situated (D400 when in public highway, shared drives or car parks, otherwise B125 where in soft areas).

Back drop connections (if applicable) shall be external and to ‘Sewers for Adoption’ 6th Edition Specification.

Adoptable Connections (Laterals)

An adoptable “lateral” is an accessible single length of drain (serves 1 property) or sewer (serves more than 1 property) not greater than 150mm diameter from a property to a public sewer on adjacent land or highway. A “demarcation” chamber should be positioned at the head of the lateral at a position 1m inside the property boundary.

lateral.jpg

Rising (pumping) mains are not acceptable as adoptable laterals. Hatch boxes are not acceptable as demarcation chambers.

Adoptable Connections (Laterals) – Pipes
Vitrified Clay Pipes to BS EN 295 kitemarked.

Structured Wall Unplasticised PVC pipes to WIS 4-35-01 kitemarked.

Product Name Diameter (mm) Manufacturer Material
SuperSleve 100 & 150 (I.D.) Hepworth Vitrified Clay
Superseal 150 (I.D.) Hepworth Vitrified Clay
Densleeve 100,150 (I.D.) Naylor Vitrified Clay
Denseal 100, 150 (I.D.) Naylor Vitrified Clay
Ultra-Drain 110 & 160 (O.D.) Uponor uPVC
Plastidrain 110 & 160 (O.D.) Hepworth uPVC
OsmaDrain 110 & 160 (O.D.) Wavin uPVC
Osma UltraRib 150 (I.D.) Wavin uPVC
Solid Wall 110 & 160 (O.D.) Marley uPVC
Quantum 150 (I.D.) Marley uPVC
Underground Drain 110 & 160 (O.D.) Polypipe uPVC
Ridgisewer 150 (I.D.) Polypipe uPVC

Adoptable Connections (Laterals) – Pipe Bedding

Pipes shall be provided with single size full granular bed and surround (class S). Pipes in highway with less than 1.2 metres cover shall not be plastic and shall be protected by reinforced concrete slab placed above.

Adoptable Connections (Laterals) – Size and Gradients
Foul: 100mm less than 10 properties min gradient 1:80
150mm greater than 10 properties min gradient 1:150

Combined: 150mm less than 10 properties min gradient 1:100
150mm greater than 10 properties min gradient 1:150

Surface Water: Minimum diameter is 150mm at min gradient 1:150.

For combined and surface water the minimum acceptable diameter is 150mm.

Adoptable Connections (Laterals) – Demarcation Chambers

Precast Concrete to BS 5911:Part 2 and BS8301 kitemarked, up to 1.0 metre deep
Polypropylene Inspection chambers to BS 7158:2001 kitemarked, min. 450mm diameter, up to 2.0 metres deep.

Manufacturer Product Name Material Max. Depth Cover Type
Naylor Plastic Inspection Chamber Polypropylene Up to 1200mm Class B125
Hepworth PPIC Polypropylene Up to 1200mm Class B125
Uponor Inspection Chamber (450mm ) Polypropylene Up to 1200mm Class B125
Marshalls Inspection Chamber To BS5911 pt 2 Precast concrete Up to 1000mm Class B125
Wavin Osma UltraRib Inspection Chamber Polypropylene Up to 1200mm Class B125
Wavin OsmaDrain Universal Inspection Chamber Polypropylene Up to 1200mm Class B125
Wavin Non Entry Inspection Chamber Polypropylene Up to 2000mm Class B125
Marley Inspection Chamber (450mm ) Polypropylene Up to 1200mm Class B125
Polypipe 110mm Inspection Chamber (460mm ) Polypropylene Up to 1200mm Class B125
Polypipe Non Man Entry Deep Inspection Chamber System Polypropylene Up to 2000mm Class B125

Concrete surround shall be provided to demarcation chamber where subject to vehicle loading (e.g. driveways). For depths in excess of 1.2m a restricted access opening 350mm diameter (or 300x300mm) shall be used.

Alternatively, pre-cast concrete ring manhole to ‘Sewers for Adoption’ 6th Edition Specification may be used as demarcation chamber. Chamber covers shall be ductile iron and appropriate strength for area situated (minimum classification B125).

Inspection by Water Authority Inspector

All completed connections must be inspected by a Inspector so that a Certificate of Satisfactory Inspection may be issued. The completed connection should be laid open for inspection. If the completed connection is backfilled without inspection by a Water Authorities Inspector the developer may later be invoiced for our CCTV costs and any costs for corrective work.

The inspection is to check workmanship only. The location and sizes of all pipes and services should be established by the developer on site prior to commencing the works. The Water Authorities statutory sewer record map is indicative and may be used as a guide only. No warranty is given with regard to its correctness.

The developer may have to correct any work that has been carried out before receipt of Water Authorities comments if the 21 day notice period has not elapsed. Additional fees will be payable for return visits to inspect corrective work.

Costs & Fees

 

For Assistance Call phone 0207 536 2778