Diversion and Build-Over Enquiry
Irish Water is responsible for all public water and wastewater infrastructure since 1 January 2014.
The water infrastructure provides raw water for treatment and, following treatment, potable drinking water for supply. The wastewater infrastructure collects untreated and, on occasion, treated wastewater from customers’ premises prior to its associated treatment and discharge. In most instances this water and wastewater infrastructure is located under the public road. However, due to access requirements at specific locations, some of this infrastructure is located in private lands. These public water supply and wastewater collection assets service multiple customers in many instances.
It is the applicants responsibility to identify the presence of any Irish Water assets within or adjacent to any proposed development. In order to assist the applicant in determining the location of Irish Water assets, the best practice is to contact Irish Water in advance of designing the proposal. Details, where known, can be obtained by emailing an Ordnance Survey map identifying the proposed location of your intended development to email@example.com.
The exact location of any Irish Water assets are to be confirmed via site investigation by the applicant. Other indicators or methodologies for identifying infrastructure located within your lands are the presence of registered wayleave agreements, visible manholes, vent stacks, valve chambers, marker posts etc. within the proposed site.
If it is determined that an Irish Water asset is located near or under your proposed development, you are required to contact Irish Water with details of your proposal in order to establish if the proposals are acceptable or if there is a need to alter or divert any Irish Water asset. Contact Irish Water by submitting the relevant application form.
Irish Water does not charge for this early engagement, however, the subsequent cost of diverting/altering/building over any asset, as well as any costs associated with supervising the works, will be included as a charge in the Diversion/Build Over Agreement. A refundable bond/surety may also be included in respect of the diversion/alteration works.
Building Near an Irish Water Asset
Minimum Separation Distance from proposed building to Irish Water Sewer
|Sewer Diameter (mm)|
|Dept to Invert||150mm - 449mm||450mm - 749mm||>750mm|
|<3m||3m||3.5m||Contact Irish Water|
|3m - 4m||3m||4m||Contact Irish Water|
|4m - 5m||5m||5m||Contact Irish Water|
|5m - 6m||5m||6m||Contact Irish Water|
|> 6m||Contact Irish Water|
Minimum Separation Distance from proposed building to public water main
|Water Main Diameter (mm)|
|Dept to Invert (m)||50mm - 100mm||100mm - 200mm||200mm - 600mm||> 600mm|
|< 3m||3m||3m||5m||Contact Irish Water|
|> 3m||Contact Irish Water|
Building over an Irish Water Sewer
- a maximum diameter of 150mm or;
- has a diameter of 225mm while serving less than thirteen (13) houses upstream of the proposed build-over works.
Building over a Public Water Main
In order to protect the water supply to other homes and business in your area, Irish Water do not permit any type of development to be built over any public water main.
Diversion or Alteration of Irish Water Assets
If it is determined that a diversion of an Irish Water asset is required to facilitate your development, you are required to enter into a Diversion Agreement with Irish Water prior to any works commencing on site. In accordance with Irish Water Connections Charging Policy and as approved by the Commission for Regulation of Utilities, the applicant will be liable for all costs associated with diverting or altering Irish Water’s water/wastewater assets.
Diversion and Build Over Process
Applicant establishes location of Irish Water assets
Applicant to determine location of all Irish Water assets on development site by:
Submitting request to firstname.lastname@example.org for high level map of known Irish Water assets.
Carrying out site investigation.
Other indicators or methodologies for identifying infrastructure located within the site are the presence of registered wayleave agreements, visible manholes, vent stacks, valve chambers, marker posts etc.
Applying for a Diversion
It is the applicants responsibility to undertake the detailed design of the proposed diversion in accordance to Irish Water Standards Details and Codes of Practice.
Submit Diversion Application Form along with the design proposal to email@example.com.
Assessment of Diversion Application
Irish Water register diversion application and assign a unique ‘DIV’ reference number.
Irish Water will assess the application to determine compliance with Irish Water Codes of Practice and Standard Details.
Irish Water issue diversions ‘Confirmation of Feasibility’
Once Irish Water completes the review and it is deemed to be acceptable the applicant is issued with a Confirmation of Feasibility letter.
Diversion Offer issued to Customer
Irish Water issues a Diversion Offer detailing terms and conditions, charges and any additional required agreements such as Deed of Easement and Collateral Warranties.
Accepting Diversion Offer
The applicant can enter into a Diversion Agreement with Irish Water by accepting the terms and conditions as set out in the Diversion Offer, submitting proof of insurances, method statements etc., and by making the required payments.
Following the acceptance of the Diversion Offer and provision of other requirements by the applicant, Irish Water will execute the Diversion Agreement and issue a notice for construction to proceed.