India, Nov. 12 -- Rising ammonia levels in the Yamuna, indicating increased untreated waste and pollutants, have led to water supply disruptions, particularly in areas receiving water from the Sonia Vihar water treatment plant.

The spike comes as the city prepares for the Chhath Puja festival. While Delhi Jal Board (DJB) has not issued any official advisory, the New Delhi Municipal Council (NDMC) in a statement stated that due to a sudden increase in pollution levels in Yamuna raw water, water production at Sonia Vihar WTP has been curtailed, affecting water supply in its command area, including several NDMC areas.

The affected areas, according to the NDMC, may include Bharti Nagar, Golf Links, Lodhi Estate, Khan Market, Rabindra Nagar....