Bronte Wells
The Ganges River in India is facing severe pollution, threatening both human health and the environment. With a vast river basin population of about 400-500 million people, the river has become a dumping ground for untreated sewage, industrial waste, agricultural runoff, and religious offerings. Despite initiatives like the Ganga Action Plan and the Namami Gange Programme, efforts to clean the river have been challenging due to corruption, disorganization, and the river's inability to maintain its ecological flow. The pollution has led to waterborne diseases, ecological degradation, and health risks from toxic heavy metals in food sources. As a revered holy river, the Ganges' pollution highlights the complex interplay between environmental issues and cultural beliefs, requiring collaborative and continuous efforts for restoration.
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What You'll Learn
Human and animal waste
The Ganges River is one of the most revered waterways in the world, stretching from the Himalayan foothills to the Bay of Bengal and providing water to nearly half a billion people. However, it is also one of the most polluted rivers globally, with human and animal waste being significant contributors.
Untreated human sewage and animal waste from the numerous cities and towns along its banks are major sources of pollution. The river flows through many densely populated areas, with approximately 75% of its pollution stemming from municipal sewage. The high population density along the river contributes significantly to the volume of sewage, and the lack of proper sewage treatment infrastructure exacerbates the problem.
Traditional religious practices, such as ritual bathing and the deposition of cremated or partially burnt human remains, also introduce human waste into the river. The cremation of bodies on ghats releases ash and other cremation by-products into the water. Additionally, cultural norms and economic constraints lead some locals to wrap their deceased in cloth and float them on the river, further adding to the pollution.
The accumulation of untreated sewage and organic waste in the Ganges has severe consequences for human health and the environment. Waterborne illnesses linked to the river's pollution kill approximately 1.5 million children annually, and "superbugs"—antibiotic-resistant bacteria—have been found in water samples. The high levels of faecal coliform bacteria, which originate from the gut and faeces of warm-blooded animals, pose a significant health risk.
To address the pollution caused by human and animal waste, several measures have been proposed and implemented. The Indian government has been working on cleaning up the Ganges since the 1980s, with initiatives like the Ganga Action Plan (GAP) launched in 1985, and more recent efforts such as the $3 billion cleanup program initiated in 2015. These programs aim to improve water quality through the interception, diversion, and treatment of domestic sewage, as well as the development of new sewage treatment technologies. Additionally, public awareness campaigns, seminars, and workshops are being conducted to educate communities about river conservation and the importance of behavioural changes to reduce pollution.
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Industrial waste
The Ganges River is one of the most polluted rivers in the world, with industrial waste being a major contributing factor. The river flows through numerous industrial cities, including Kanpur, Prayagraj, Varanasi, and Patna, which actively discharge untreated industrial waste into the river. This waste includes toxic and non-biodegradable substances, such as heavy metals, plastics, and chemical effluents from tanneries, chemical plants, textile mills, distilleries, slaughterhouses, and hospitals.
Industrial effluents account for about 12% of the total volume of waste reaching the Ganges River. While this may seem like a relatively low proportion, it is a major concern due to the toxic nature of these pollutants. Heavy metals, such as lead and copper, are of particular worry as they are not readily biodegradable and can accumulate in the environment, leading to serious health risks for both humans and animals. High concentrations of these metals have been found in the river, posing a significant threat to the health of the estimated 500 million people who rely on the river for water and the wildlife that inhabits it.
The burning of coal by power plants located on the banks of the river is another source of industrial pollution. One coal-based power plant on the Pandu River, a tributary of the Ganges, releases 210,000 tons of fly ash into the water each year. Fly ash contains toxic heavy metals, and its presence further contributes to the high levels of pollution in the river.
The disposal of plastic waste is also a significant issue. Plastics from industrial processes and human activities, such as ritual offerings, accumulate in the river, adding to the overall pollution levels. Furthermore, agricultural runoff carrying fertilizers, pesticides, and herbicides contributes to the problem by increasing nutrient loads, causing eutrophication, oxygen depletion, and introducing additional toxic pollutants harmful to aquatic life.
The pollution of the Ganges River has severe consequences for human health and the environment. Waterborne illnesses linked to the river's pollution kill about 1.5 million children each year, and superbugs resistant to common antibiotics have been found in water samples. The river's ecosystem has also been impacted, with the population of Ganges river dolphins declining due to fishing and pollution.
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Agricultural runoff
Agricultural practices, such as the use of chemical fertilizers, pesticides, and insecticides, have a detrimental impact on the river's water quality. The excessive use of these chemicals in agriculture leads to increased nutrient loads in the river, causing eutrophication and oxygen depletion. This process not only harms aquatic life but also introduces toxic pollutants that are harmful to human health.
One of the key pesticides detected in the river is lindane, which has been banned but continues to be used in agricultural practices. The presence of heavy metals, such as iron (Fe), manganese (Mn), zinc (Zn), and chromium (Cr), has also been observed, indicating greater contamination in stretches of the river influenced by human activity.
The surge in groundwater extraction for dry season irrigation in intensive agriculture has led to a sharp decrease in critical dry-weather baseflow contributions. This, in turn, has resulted in a decline in streamflow, potentially harming the health of aquatic ecosystems. Additionally, over 40% of the annual flow of the Ganges River until Kanpur is diverted for canal irrigation, further impacting the natural flow and health of the river.
To address the issue of agricultural runoff, sustainable farming practices have been proposed. This includes encouraging conservation agriculture, implementing crop rotation, and promoting the use of organic fertilizers to minimize pollution. By adopting these practices, it is hoped that the negative impact of agricultural runoff on the Ganges River can be reduced, improving water quality and mitigating the risks to human and aquatic health.
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Population growth
The river supplies water to approximately 40% of India's population across 11 states, serving an estimated 400 to 500 million people. Water is extracted from the river for various purposes, including food, irrigation, and general human needs. This high demand for water has disrupted the natural flow of the river, affecting the health of the river and the wildlife that depends on it.
The increasing population has also led to the expansion of industrial and agricultural activities in the region. Industrial waste, including toxic and non-biodegradable substances, is dumped untreated into the river. Agricultural practices, such as the use of chemical fertilizers, pesticides, and insecticides, further contribute to the pollution of the river.
Migration from rural areas to urban centers along the Ganges basin exacerbates the problem. As people move to cities like Varanasi and Kolkata, the existing sewage treatment capacities are overwhelmed, resulting in higher levels of untreated effluents entering the river. This rapid urbanization strains the infrastructure and leads to increased pollution from plastics, heavy metals, and organic waste.
The combination of population growth, urbanization, and the demand for water has severely impacted the Ganges River. Efforts to clean the river and restore its biodiversity are ongoing, but it is a challenging and long-term process that requires a shift in perception and rituals associated with the sacred river.
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Religious practices
The Ganges River is revered by Hindus as the Mother Goddess Ganga and is a focus of religious devotion for tens of millions of people worldwide. The river is integral to various social, cultural, and religious functions. Religious practices such as ritual bathing, leaving offerings, and depositing cremated or half-burnt bodies contribute to the pollution of the river.
Every day, around three million litres of sewage is emptied into the Ganges, with only about half of that treated. The river's waters are so contaminated that it is considered one of the most polluted waterways globally. The high levels of pathogens from sewage lead to waterborne diseases like cholera and the emergence of antibiotic-resistant bacteria.
Traditional religious practices further contribute to the pollution. For example, during the Ardh Kumbh Mela, hundreds of millions of people gather on the riverbanks for ritual bathing. The Ganges is also the site of other religious rites, including discharging offerings like coins, milk, flowers, and organic ashes into the water. The immersion of idols after religious festivals and the deposition of cremated remains or uncremated bodies further add to the pollution.
Mass religious gatherings, where people engage in bathing and other religious rites, pose immediate health risks to participants and downstream communities due to the intense pollution. These gatherings also affect the local economies, particularly those with fewer resources to cope with environmental degradation.
Some efforts have been made to reduce religious pollution. For example, electric crematoria have been constructed in Varanasi and other holy riverside towns as an alternative to traditional wooden pyres. This helps reduce river pollution and the number of trees cut down for funeral pyres. Additionally, educational programs teach riverside residents the importance of keeping the river clean, and there is a growing consciousness, especially among the younger generation, about the impact of religious practices on the river's health.
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Frequently asked questions
The main causes of pollution in the Ganges River are the disposal of untreated human sewage and animal waste, increasing population density, and the discharge of industrial waste.
The consequences of the river pollution are severe human health risks from waterborne diseases and the accumulation of toxic heavy metals in food sources like fish and vegetables. There is also ecological degradation, including the rapid decline and local extinction of native fish species and threats to endangered species like the Ganges river dolphin and softshell turtle.
The Indian government has launched the Namami Gange programme to revitalise the river. Measures being taken include the rehabilitation of existing sewage treatment plants, planting native trees along the water, and encouraging farmers to use more sustainable practices. Despite these efforts, the river remains polluted, with activities such as illegal sand mining and riverfront development projects continuing to harm its health.
