In the HDC long term plan 2018-2028, the council committed $47.8m to enhance drinking water safety, an issue the council identified as a priority.
This work included the provision of new treatment facilities, booster pump stations and reservoir storage to ensure a safe, resilient drinking water supply.
For the Eastbourne and Frimley drinking water supplies, it has been proposed that new water treatment and storage facilities be built at Frimley Park and at Eastbourne, on the corner of Southampton St East and Hastings St South.
These proposals are yet to go out for consultation.
The drilling will take place between the hours of 7am to 6pm, Monday to Saturday, and is expected to create some noise, but measures will be in place to try and limit the volume.
The work will not affect access to services for nearby properties.
Similar work will take place drilling two investigation bores in Frimley Park, and will begin the week of December 2.