Sonia Vihar Sonia Vihar is a northeastern suburb of Delhi, located near Wazirabad along the Yamuna River. It is known for its water treatment plant, which supplies potable water to the city. Part of the North East Delhi district and the Karawal Nagar assembly constituency, Sonia Vihar has a diverse community, primarily consisting of residents from Uttarakhand, Bihar and eastern Uttar Pradesh.