Dublin City Council has said restrictions to water supplies may be unavoidable if the dry weather continues and demand for water increases over the summer.
The local authority has said that there is no immediate need to impose restrictions, but it is urging members of the public and businesses to conserve water.
Rainfall in the greater Dublin area in March and April this year was only one third of the normal average amount, leading to lower levels in reservoirs.
The situation affects the supply across the entire Dublin region, which takes in areas managed by the four Dublin local authorities and Wicklow and Kildare county councils.
A spokesperson for Dublin City Council said the appeal for conservation was a pre-emptive measure, but restrictions are possible if dry weather continues.
Information on how to conserve water is available here.