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Ministry of Sustainability and the Environment
Parliament Q&A

Written Reply to Parliamentary Question on Selection Criteria for Project Wolbachia

4 February 2026

Written Reply to Parliamentary Question on Selection Criteria for Project Wolbachia by Ms Grace Fu, Minister for Sustainability and the Environment.

Question:

Ms Valerie Lee. To ask the Minister for Sustainability and the Environment (a) what other factors, besides Aedes mosquito population, historical dengue prevalence and estate size and landscape, are considered for the selection of estates for Project Wolbachia releases; (b) what percentage of households in private residential estates is currently included in Project Wolbachia; and (c) whether there are plans for Project Wolbachia to be expanded to Changi Division.

Answer:

Site selection for Project Wolbachia is based on the assessed dengue risk of the area and the main considerations are the historical dengue situation, current Aedes aegypti mosquito population, and the size and landscape of the area.

Currently, Project Wolbachia covers 35% of private landed estate households. The National Environment Agency (NEA) has announced that Project Wolbachia will be expanded to the Housing and Development Board (HDB) estate in Pasir Ris, which includes parts of Changi division, from March 2026. NEA will announce new sites for further expansion of Project Wolbachia when ready.

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