The shortage is caused by lower supply from a local water plant, the department director Le Van Duc said on June 9.
All water plants in Hanoi have a combined capacity of around 925,000 cubic meters per day, according to the department.
One new facility with a capacity of 30,000 cubic meter a day was at Bac Thang Long Water Plant last year. However, this fails to increase the total capacity of the city, as the water source, the Da River, currently runs low.
With water demand normally increasing by 12% during the hot summer, it is estimated that many parts of the city will experience water shortage, the department admitted.
The shortage ranges from 70,000 to nearly 100,000 cubic meters per 24-hour period.
The affected areas include Buoi Street in Ba Dinh District and Thuy Khue Street in Tay Ho District.
Clean water supply is also expected to fall short for residents living on streets including Hang Buom, Tran Nhat Duat, Hang Tre, Hang Gai, and Hai Ba Trung in Hoan Kiem District.
Several streets in Dong Da District including De La Thanh, Lang, and Thai Thinh 2 will also be affected.
Officials of the municipal Department of Construction have asked employees of all water plants citywide to run their facilities at maximum capacity in order to alleviate the coming problem.
The department said it may supply clean water to affected areas by tank trucks, if necessary.