A silent threat may already be sitting on family dining tables across India. It cannot be seen. It has no smell. It has no taste. Yet, scientists warn it could be entering daily meals and drinking water, building up slowly in the body and raising the risk of long-term illness.

New research led by the University of Bristol has raised serious concerns that poorly regulated contaminated industrial land in India is allowing toxic substances to seep into soil and groundwater, eventually making their way into food systems. This, experts say, is not just an environmental issue—it is a growing public health concern affecting ordinary people.

“Contaminated sites are often invisible environmental problems. Pollutants may accumulate slowly in soil and groundwater, but the effects can last for generations if not properly managed. Current regulations are fragmented across sectors, so they’re not fit for purpose, which leads to inadequate protection of public health and the environment from the long-term impacts of contaminated sites,” said Dr Jagannath Biswakarma, lead author of the study.

Contaminated sites are areas where harmful substances—such as heavy metals like lead, cadmium, and mercury, along with chemicals from pesticides, plastics, dyes, and industrial waste—settle into the ground. Over time, these substances do not simply disappear. They linger. They spread. And crucially, they enter crops and water supplies.

In simple terms, this process is called “bioaccumulation.”. It means tiny amounts of toxins build up slowly inside plants, animals, and humans over time. A vegetable grown in polluted soil may carry traces of these chemicals. Water drawn from contaminated groundwater may contain invisible toxins. Consumed daily, even in small amounts, these can quietly affect health over years, leading to chronic illnesses such as cancer, neurological disorders, and reproductive issues.

The scale of the problem, researchers say, is deeply worrying. India generates about 15.66 million metric tonnes of hazardous waste every year. Yet, fewer than 200 sites are officially listed as contaminated or potentially contaminated.

Dr Biswakarma pointed to a stark comparison: “India generates 15.66 million metric tonnes of hazardous waste annually, according to recent figures, yet there are fewer than 200 officially contaminated or likely contaminated sites in total. By contrast, Switzerland – which is 80 times smaller than India in total land area with fewer industries – has nearly 39 times more contaminated sites. The scale of this gap is alarming and suggests many potentially polluted areas may still be unidentified.”

In many cases, these sites are not in remote industrial zones. They exist close to homes, farms, and water sources.

“Many sites are located in densely populated areas, and that contamination often remains hidden while persisting for decades. Contaminated site management often falls across various regulatory areas, including soil protection, groundwater management, hazardous waste regulation, and public health,” explained Dr Kavitha Sambasivam of VIT, Vellore.

The problem, experts say, is not just pollution but fragmentation. Different agencies handle different aspects of contamination. Soil, water, waste, and health are treated separately. As a result, no single system tracks the full risk.

To address this issue, researchers have proposed a coordinated framework called Contaminated Site Monitoring, Assessment, and Remediation (CS-MAR). It aims to map polluted sites, track data centrally, prioritise cleanup based on risk, and involve communities in monitoring.

International models offer clues, but not easy solutions. Countries like the United States and the United Kingdom have long-standing systems to identify and clean contaminated land. However, adapting these to India will require more than copying policy.

“Environmental governance systems differ widely between countries. Our study outlines possible pathways for integration, but real progress will depend on institutional coordination, political commitment, and investment in environmental monitoring,” said Professor Asif Qureshi of IIT Hyderabad.

Scientists also highlight the role of modern monitoring tools and public-private partnerships but stress that technology alone cannot fix weak governance.

At its core, the issue remains deeply human. Food grown in contaminated soil. Water drawn from polluted ground. Exposure that stretches silently across generations.

Professor Ravi Naidu, associated with the UN’s Food and Agriculture Organisation network on soil pollution, noted that such challenges are common across developing nations and require urgent attention.

The study calls for stronger links between science, policy, and public awareness. Building a national inventory of contaminated sites, improving transparency, and strengthening technical capacity are considered critical first steps.

Until then, the danger remains largely unseen. Not in distant wastelands, but closer—much closer—to home.