Yes, Bhopal is still toxic. Nearly four decades after the 1984 Union Carbide gas disaster, the abandoned factory site continues leaking poisons into surrounding soil and groundwater. The 337 tonnes of contained hazardous waste that made headlines when the government finally began removing it in early 2025 represent less than 1% of the estimated one million tonnes of toxic material believed to remain at the site. For the communities living nearby, the contamination is not history. It is an ongoing public health crisis with consequences that now span three generations.
What the Soil and Groundwater Tests Show
In August 2023, a joint committee ordered by India’s National Green Tribunal collected soil and water samples from in and around the former factory grounds. Mercury levels in buried sludge reached 9.44 milligrams per kilogram, and an ash layer tested at 7.36 mg/kg. Surface soils ranged from 0.28 to 1.72 mg/kg. The committee noted these levels fell below India’s screening thresholds for industrial land, but that framing obscures a basic fact: thousands of people live on and around this land, and it was never meant to remain an industrial sacrifice zone indefinitely.
Groundwater samples from nearby hand pumps and borewells told a somewhat more reassuring story for the specific wells tested. Mercury was not detected in any of the samples. Lead appeared at low levels in one borewell and one monitoring point. Chromium and nickel showed up at two piezometric monitoring stations near the old factory’s waste disposal area. The tribunal’s pollution control board reported that piped tap water supplied to nearby colonies generally met India’s drinking water standards, though some borewell and tubewell samples exceeded acceptable limits for turbidity, dissolved solids, chlorides, hardness, and fluoride.
These results need context. The testing covered a limited number of sampling points. Campaigners and independent researchers have long argued that the contamination plume extends well beyond the spots typically tested, and that the real danger lies in the massive volume of uncontained toxic material still sitting in the soil rather than in the smaller quantity of drummed waste the government has focused on removing.
The Waste That Took 40 Years to Move
For decades, 337 tonnes of hazardous chemical waste sat in storage on the derelict factory grounds while courts, governments, and corporations argued over responsibility. In 2015, a trial run incinerated 10 tonnes at a facility in Pithampur, about 250 kilometers away, and officials called the results positive. Then nothing happened for years.
The logjam finally broke in early January 2025, when the Madhya Pradesh state government began transporting the waste in twelve leak-proof containers to the Pithampur incinerator. A three-phase trial burned 30 tonnes, and by March 2025 the government declared the operation successful and started incinerating the remaining 307 tonnes at a rate of 270 kilograms per hour.
This sounds like progress, and in a narrow sense it is. But researchers at The Open University’s Harm and Evidence Research Collaborative raised a pointed question: if the goal is to clean up the Union Carbide site, why focus exclusively on the 337 tonnes of contained waste that had been sitting securely in drums for years, while ignoring the vastly larger volume of contaminated soil and groundwater? The factory itself is still leaking. Removing the drummed waste addresses about 1% of the problem.
Health Effects Across Generations
The 1984 leak of methyl isocyanate killed an estimated 30,000 people over the years that followed. What has become clearer with time is that the damage did not stop with the people who breathed the gas that night. The chemical has been shown to damage human chromosomes, and early clinical studies on exposed populations found increased chromosomal aberrations, the kind of genetic disruption that can manifest as cancer or be passed to children.
A study published in BMJ Open used spatial analysis to track health outcomes for people who were in utero during the disaster. Adults who had been exposed before birth showed an eightfold higher cancer risk compared to those born before or after the disaster who lived farther from Bhopal. They also had lower educational attainment more than 30 years later, suggesting lasting neurological or developmental effects.
The reproductive toll has been severe. Miscarriage rates quadrupled after the gas leak, and risks of stillbirth and neonatal death climbed alongside them. Decades later, menstrual abnormalities and premature menopause remain common among exposed women and, notably, among their daughters who were never directly exposed to the gas. Changes in the sex ratio of children born in 1985 were detectable up to 100 kilometers from the accident site: the proportion of male births dropped from 64% in the years before the disaster to 60% in the year after, a shift consistent with the known vulnerability of male fetuses to toxic chemical exposure.
Why Legal Battles Haven’t Helped
In March 2023, India’s Supreme Court dismissed a curative petition that sought to reopen the compensation settlement between the Indian government and Union Carbide (now owned by Dow Chemical). A five-judge bench acknowledged the suffering but said settled legal principles could not be overridden by sympathy alone. The court noted that either the original settlement was valid or it had been obtained through fraud, and no fraud had been alleged.
The ruling did include one forward-looking provision: it recognized that asymptomatic survivors might develop symptoms in the future, and that children born to exposed mothers could later show congenital defects. For these cases, the court suggested the Indian government, as a welfare state, bear responsibility, including through a medical group insurance scheme. In practice, survivors and advocacy groups say this has translated into inadequate care and bureaucratic obstacles rather than meaningful support.
The legal dead end matters because it effectively closed the last avenue for forcing the corporate successor to Union Carbide to fund a comprehensive site cleanup. The cost of remediating over a million tonnes of contaminated material would be enormous, and with no legal mechanism to compel Dow Chemical to pay, the burden falls entirely on Indian taxpayers and, more realistically, on the people who continue living next to the site.
What “Still Toxic” Actually Means for Residents
The communities surrounding the old factory are not wealthy. Many residents rely on hand pumps and borewells for water. While the 2023 government testing found piped municipal water largely within safety limits, the borewell samples that exceeded standards for multiple parameters are the water sources people actually use when municipal supply is unreliable, which in many Indian cities is often.
The contamination is not a uniform blanket. Some wells test clean; others do not. Some soil is heavily loaded with mercury and other heavy metals; nearby patches may be less affected. This patchwork makes it easy for officials to point to clean samples while residents a few hundred meters away draw from contaminated sources. It also makes it nearly impossible for individual families to know whether their specific water supply is safe without testing they cannot afford.
For the children and grandchildren of survivors, the concern is not just environmental exposure but inherited vulnerability. The chromosomal damage documented in the first generation, combined with the reproductive and developmental abnormalities seen in the second, means this population carries biological risks that clean water alone cannot resolve. Bhopal in 2025 is not the acute catastrophe of 1984. It is something harder to see and easier to ignore: a slow, multigenerational poisoning, still unfolding, still unresolved.