The municipal People's Committee Vice Chairman Nguyen Quoc Hung said the city would start construction of a new plant to exploit surface water from the Hong River in Dan Phuong District in October 2015.
The new plant - to be completed by the end of 2017 - is expected to supply more than 300,000m3 per day to the city.
Another project has also been started to increase the capacity of the Bac Thang Long - Van Tri Water Plant in Dong Anh District. It will provide more 30,000m3 of water per day to residents of Hoan Kiem and Hai Ba Trung, and several inner city areas by March 2016.
The city has also decided to build an emergency pipeline to bring water from the Da River to the area near the National Convention Centre, Hung said. The 20km pipeline will help ease pressure on existing sources that could break at any time.
According to Hung, "The emergency pipeline will reduce the pressure and ensure safety on the main pipeline. After completion, it will share between 80,000 and 100,000m3 of water with the main pipeline to ensure water supplies for the city's residents."