Developer Quick Links
Know what you're looking for? Find the form below.
Applications
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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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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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Plans of Water Main or Public Sewers
If you want to see whether your building or land contains any, then ask for your map here
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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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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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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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Pre Planning Advice
Tell us about your proposed development
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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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Self Lay Water Mains and Services
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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Water Main Diversion
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
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Public Sewer Requisition
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
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CCTV surveys
If you’d like to locate a sewer, you can apply for one of our CCTV surveys/sewer traces
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Building Regulations form
This form is for local authorities and building control companies only
