Toxic Waste Triggers Mass Fish Deaths in Najafgarh Drain Sparks Alarm Over Yamuna Pollution

New Delhi- Thousands of dead fish have been found floating in the Najafgarh drain near the Dhansa regulator over the past few days, raising serious environmental concerns about rising pollution levels in the capital’s water bodies.

Environmental activists have attributed the массов mortality to a toxic mix of untreated domestic sewage and industrial effluents entering the drain, which eventually flows into the Yamuna River. The incident has been reported around Rawta village, close to the Delhi-Haryana border.

Experts suggest that the combination of pollutants, along with rising temperatures, may have significantly reduced dissolved oxygen levels in the water, leading to large-scale fish deaths. Environmentalists warn that such घटनाएं indicate severe ecological stress and deteriorating water quality.

Recent data from the Delhi Pollution Control Committee has already flagged alarming pollution levels in the drain, with biological oxygen demand (BOD) recorded far above permissible limits. High BOD levels indicate excessive organic pollution, which depletes oxygen required for aquatic life.

Scientists point out that fish act as key bio-indicators of ecosystem health, and their sudden deaths often signal deeper environmental imbalances. The presence of multiple pollutants can also lead to “mixture toxicity,” where chemicals interact and create more harmful effects than individual contaminants alone.

The Najafgarh drain, considered one of the most polluted channels in Delhi, has long been a major contributor to pollution in the Yamuna. Experts and activists have called for urgent investigation and corrective measures to address the source of contamination and prevent further ecological damage.

Authorities are yet to issue an official explanation, even as concerns grow over the impact on water quality and public health.