Under section 185 of the Water Industry Act 1991, you can request for a public sewer to be altered, diverted or removed so your site can be developed.
Section 185 puts a duty on us to divert apparatus in land, once we've received notice from persons who have an interest in the land, as necessary to enable that person to carry out a proposed improvement of the land. This duty does not arise when apparatus is located in, under or over any street.
Diversion of public sewers can be a lengthy process. All parties involved (developers, consultants, contractors, project managers) need to be aware of the process, costs, legal and technical requirements and programme implications. Developers need to make that enough time has been included in their build programme for sewer diversion before the development starts.
Our Developers Guide to Sewer Diversion (S185) provides all the information you need when applying for an alteration or diversion to a public sewer and an overview of the vesting process and requirements.
Developers guide to sewer diversions
You can read this document in your browser or download it.
Minor Sewer Diversion
The procedure for applying for a minor sewer diversion is outlined below, along with the relevant forms for completion
Any diversions to the public sewer network shall not be commenced until the S185 legal Agreement with Yorkshire Water is in place.
During construction, our inspectors will attend site to monitor work being undertaken on site in relation to the diversion of our assets.
The sewer to be abandoned must be clearly indicated on the drawings submitted for Technical Approval and the method of abandoning the sewer must be stated.
You will need
- Location plan
- S185 layout plan
- Longitudinal sections
- Manhole schedules
- Construction details
- Camera survey
- F10 notice
- Hydraulic calculations
- Any additional information that would support your application.
You can also finish an incomplete application or view a previous application in our old portal.
You can download our health and safety sewer diversion request form (S185).
Stage 1: Application and Assessment
To submit an application, you can either download a form or make an application online. Once you have submitted your completed application form, proposed drawings and camera survey, we will technically assess your submission and provide an initial response detailing whether the proposals are acceptable or not.
Apply online for a sewer diversion
You can also finish an incomplete application or view a previous application in our old portal.
Stage 2: Diversion Agreement
Any diversions to the public sewer network shall not be commenced until the S185 legal Agreement with Yorkshire Water is in place.
Stage 3: Construction
During construction, our inspectors will attend site to monitor work being undertaken on site in relation to the diversion of our assets.
When the diversion is complete, along with any outstanding remedial work, it is your responsibility to provide us with ‘as built’ drawings for the works undertaken. A copy of all the drawings included within the signed S185 Agreement must be provided in ‘as built’ format.
Stage 4: Maintenance Period
When the flows have been turned, you can request a Pre Maintenance inspection. Please download, complete and return this request form to us along with supporting information.
Pre-Maintenance Request Form for Sewer Diversion
You can also download and print this PDF or fill it out using Adobe Acrobat Reader.
Stage 5: Final Inspection
Once your site is within three months of the end of its maintenance period, has been operating as expected during this time (with no operational issues) and there are no outstanding remedial works to complete, you can start to make preparations for the Final Inspection.
If you would like to request a Final Inspection of your site, please download, complete and return this request form to us along with the supporting information.
Final Inspection Request Form for Sewer Diversion
You can also download and print this PDF or fill it out using Adobe Acrobat Reader.
Major Sewer Diversion (Developer Led)
Where a large diameter (600mm or larger) public sewer crosses a site, a developer can submit a request to us to undertake a reasonable diversion of it. We encourage you to engage in early discussions with us so we can guide you through the process requirements whilst ensuring the performance and longevity of the altered or diverted sewer is not compromised.
We are happy to meet with you at the outset of the process, prior to submission of a complete application, to ensure our requirements are clear and any issues with a site can be discussed at an early stage.
Any diversions to the public sewer network shall not be commenced until the S185 legal Agreement with Yorkshire Water is in place.