Applications
Already know what you need? Here’s a handy bank of all our applications so you can quickly access the ones you need:
Planning applicationsOur specialist planning team can work with you from the moment you’re thinking of building a new property to extending your house. Here’s a list of our services:
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Drainage and water searches
If you want to apply for a water and drainage search on a property, you can apply using this application form. One of our team will then be in touch
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Build over sewer self certification
A shorter process where you can 'self-certify' as long as you meet certain criteria in regard to how your work will protect our sewer
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Build over sewer form
A more detailed process, needed for more complicated or higher risk work, that involves a technical assessment of your proposals by our dedicated team
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Pre-planning application form
Tell us about your proposed development
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Building Regulations form
This form is for local authorities and building control companies only
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Map of Water Mains or Public Sewers
If you want to see whether your building or land contains any, then ask for your map here
Water applicationsFrom water connections to a single property to major water main diversions, our experienced team looking after water queries can help.
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New water connections – standard size
This service is for new and replacement water connections.
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New water connections - large diameter
This service is for large diameter new water connections.
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Self lay water mains
A self-lay water main is where you choose to have your new water main laid by an accredited self-lay contractor instead of us
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Requisition a Water Main
Requisitioning involves Welsh Water designing and laying the water main
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Diverting, altering or abandoning a water main
If you want to divert, alter or remove water mains or apparatus on land that you have an interest in or own, we’re your team
Waste applicationsFrom waste connections to a single property to major sewer diversions, our experienced team of engineers can help.
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New sewer connections
If you’re building a new home or development, you probably want to connect to one of our sewerage pipes so that we can take away your surface water and wastewater to treat, clean and return to the environment
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Adopting proposed sewerage systems
If you are applying for a new sewer connection and the sewer is outside of your property boundary, or it serves more than one building, then you’ll need to ask us to enter an adoption agreement with you first before building
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Diverting, altering or abandoning a sewer
If you want to improve or develop land that you own, and the public sewerage would likely stop or hinder your development, then you have the right to request its alteration or removal
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Sewer requisitions
Sometimes your home or site has no way of draining to a public sewer due to the land between the site and the sewer being owned by a third party. If the third party won't give you access to the land, then you can also formally request (requisition) a public sewer and/or lateral drain from us
Application forms
Maps of water pipes and sewers
Drainage and water searches
New water connections - large diameter (63mm)
New water main
Diverting or abandoning a water main
Adopting existing sewerage
Requisition a public sewer and or lateral drain
New water connection
New sewer connection
Public sewer adoption
Public sewer diversion
Build over sewer self certification
Build over sewer full application
Dŵr Cymru Welsh Water
PO Box 3146
Linea
Fortran Road
Cardiff
CF30 0EH
If you’re posting the forms to us, make sure you also include your payment made payable to Dŵr Cymru Welsh Water. Incorrect postage costs could result in your application form being returned by the Post Office, so check the weight and postage costs beforehand.