Delhi's water supply is under pressure as ammonia levels in the Yamuna River have shot past safe limits, now hitting 1.5 to 2 parts per million.
This spike is making it tough for treatment plants like Wazirabad and Chandrawal to keep things running smoothly.
Delhi Jal Board mixes cleaner water
High ammonia reacts badly with chlorine during treatment, creating compounds that aren't safe to drink, so the Delhi Jal Board has had to mix in cleaner water from other sources just to keep taps flowing.
The pollution is attributed to untreated industrial discharge upstream of Wazirabad, including suspected industrial sources in Sonipat and Panipat, fueling a blame game between Delhi and Haryana.
As the city prepares for the Chhath festival and after completion of the Upper Ganga Canal's maintenance period, supply issues could get worse if things don't improve soon.