From Janki Chatti to Delhi: the Yamuna’s striking contrast and the sewage crisis behind it

An Instagram reel shared in October 2026 places two very different views of the Yamuna together. The first shows turquoise water rushing over rocks, labelled as the river near Janki Chatti in Uttarakhand, about six kilometres downstream of Yamunotri temple. The second shows a broad mass of white froth beneath a bridge, labelled “Yamuna in Delhi”. The account sharing the reel credits Anupam Joshi for the mountain image.

The contrast is powerful, but it is not a water-quality test. The original recording dates and precise locations of the two scenes have not been independently established. What can be checked is the underlying question: how badly does the Yamuna’s water quality change through Delhi, and why does foam develop there?

From an upstream entry point to a polluted city stretch

Government measurements show a sharp deterioration within Delhi itself. In a Lok Sabha reply published on 31 July 2025, the Ministry of Jal Shakti gave water-quality results for several points on the river. In January 2025, at Palla, where the river enters Delhi, biochemical oxygen demand (BOD) was 3 milligrams per litre and dissolved oxygen was 6 milligrams per litre. At Nizamuddin, BOD reached 39 and dissolved oxygen was reported below the test’s detection limit of 0.3. Downstream of Okhla Barrage, BOD was 50 and dissolved oxygen was also below that limit.

BOD measures how much oxygen is needed to break down organic waste in water. High BOD means that waste can consume oxygen needed by fish and other river life. For the water-quality criteria quoted by the ministry, BOD should be below 3 milligrams per litre and dissolved oxygen above 5. The same January samples recorded faecal coliform counts of 950 per 100 millilitres at Palla, 4,60,000 at Nizamuddin and 4,10,000 below Okhla, against a maximum criterion of 2,500. These bacteria are indicators of contamination associated with faecal waste; the readings do not by themselves identify every pathogen present.

These figures compare sampling stations in the same month, not the water pictured in the reel. They nonetheless establish that serious pollution is not merely an impression created by the white froth.

Why does thick foam appear on the Yamuna?

The Delhi government’s study of Yamuna frothing, based on sampling in 2024–25, found that foam forms through a combination of polluted water, foam-forming substances known as surfactants, and physical churning. Surfactants can come from detergents and other human activities, but some can also arise from biological material. Water turbulence around structures such as Okhla Barrage helps create and hold the bubbles.

So the froth cannot be confidently labelled as one particular industrial chemical from its appearance alone. Equally, saying that all river foam is natural would disregard the measured pollution and the study’s findings. In a mountain stream, white water over rocks can simply reflect fast-flowing, turbulent water. In Delhi, the sustained foam problem must be understood alongside wastewater contamination, low oxygen and local flow conditions.

Why treatment capacity has not been enough

The central problem is wastewater reaching the river or its drains without adequate treatment. In the July 2025 parliamentary reply, Delhi Jal Board estimated daily sewage generation at 3,596 million litres, against installed treatment capacity of 3,474 million litres. Plants were then actually treating about 2,955 million litres per day; only about 2,014 million litres of their treated output came from plants meeting Delhi Pollution Control Committee discharge standards. The ministry reported approximately 641 million litres per day remaining untreated.

A later Rajya Sabha reply of 1 December 2025 placed the sewage-treatment gap at 414 million litres per day in August 2025. The figures concern different months and measures, not an independently verified account of conditions in October 2026. That reply also identified missing common treatment plants in some industrial areas and delays in upgrading sewerage systems. Treatment plants, working drains, proper sewer connections and enforcement all matter; a capacity figure alone does not mean clean water is being released.

What the latest monitoring shows

The problem persisted in 2026. Reporting on Delhi Pollution Control Committee samples taken on 7 September 2026 found BOD of 30 milligrams per litre at ISBT Bridge—ten times the 3-milligram water-quality benchmark—and faecal coliform of 35,000 per 100 millilitres. The previous September’s values at that point had been lower. Pollution indicators vary with rainfall, river flow, upstream releases and the amount of wastewater entering the channel; some places and months improve while others deteriorate. One month cannot establish that every location is getting worse every day.

Restoration projects and spending are real, but their success needs to be judged against what actually flows into the river. The December 2025 parliamentary reply listed 35 sanctioned Yamuna rejuvenation projects across the basin, 21 completed at that point. Those figures describe project progress, not proof that Delhi’s river water had become safe.

What this contrast demands

The reel’s most important contrast is between a river presented as a lively mountain stream and the serious contamination documented in the capital. The response cannot stop at removing visible foam or collecting rubbish from the banks. It requires preventing untreated sewage from entering drains, bringing treatment plants into compliance, controlling industrial discharges, maintaining enough river flow and publishing water-quality results that the public can scrutinise.

Allowing inadequately treated wastewater to keep entering a shared river despite years of documented evidence is an unjust failure of environmental protection. That judgment concerns the established condition and the responsibilities of public systems and polluters; the available evidence does not assign the entire problem to one official, government or source shown in this reel. The river’s changing appearance makes the crisis visible. Repeated testing and effective wastewater control are what can show whether it is being repaired.