Jala Poorna Trayodasi is observed on the previous day of Diwali (Deepavali) and Narak Chaturdashi. Jalapoorna Trayodashi 2024 date is October 29. Hindu homes on the day clean all the vessels in which water is stored. They are then filled with fresh water. Prayers are offered to Goddess Ganga. After the puja the water is considered to be the water from Ganga River
The water is used to take bath on the next day – Diwali day. The ritual of taking bath with herbs from the water stored on Jal Poorna Trayodashi is known as Abhyanga Snana.
A similar ritual that is observed by certain communities in Karnataka is known as Neer Thumba Habba.