This page contains all the forms and their relevant guidance notes required for any matters concerning the Southern Water sewerage and water networks.

It is advisable to read the guidance notes before filling in a form. Many forms require detailed site and other information and care should be taken that all information requested is filled in otherwise the application could be delayed. Most forms will require an application fee which must accompany the form.

Please use the postcode checker to ensure your property/development is in the Southern Water region.

Water Application Forms - Please also refer to the guidance notes below

Capacity Check Application Form
S41 Water Main Requisition Application Form 
S45 Water Connection Estimate Form 
S185 Water Main Diversion Application Form 

Water Guidance Notes

Capacity Check Guidance Note
S41 Water Main Requisition Guidance Note
S45 New Connection Guidance Note
Self Lay Guidance Note 
Infrastructure Charges leaflet

Sewerage Application Forms - Please also refer to the guidance notes below

Capacity Check Application Form 
Build Over Application form 
S98 Off-site Sewer Requisition Application Form 
S102 Adoption of existing Sewers, Wastewater Pumping Stations and Treatment Works Form 
S104 Sewers for Adoption Application Form 
S106 Sewer Connection Application Form 
S185 Sewer Diversion Application Form 

Sewerage Guidance Notes

Capacity Check Guidance Note
Build Over Guidance Note
S98 Off-site Sewer Requisition Guidance Note
S102 Sewers for Adoption Guidance Note
S104 Sewers to be Offered for Adoption
S106 Sewer Connection Guidance Note
S185 Sewer Diversion Guidance Note
Infrastructure Charges leaflet