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The Ganges River, stretching from the Himalayas to the Bay of Bengal, is a vital source of water for hundreds of millions of people and wildlife. However, it is also one of the most polluted rivers in the world. The main causes of pollution are the disposal of human and animal waste, industrial waste, increasing population density, religious practices, and agricultural activities. These have led to severe health risks, ecological degradation, and threats to endangered species. Despite efforts to clean the river, it remains heavily polluted, and the pollution is having a significant impact on the environment and communities that rely on it.
| Characteristics | Values |
|---|---|
| Main causes of water pollution | The disposal of human sewage and animal waste, increasing population density, and the discharge of industrial waste |
| Population density | The river flows through 100 cities with populations exceeding 100,000 residents, 97 cities with populations between 50,000 and 100,000 residents, and about 48 towns |
| Sewage treatment | Three-quarters of all the sewage generated in the northern plains remains completely untreated before being discharged into the Ganges and its tributaries |
| Industrial waste | Industrial effluents account for about 12% of the total volume of waste reaching the Ganges |
| Toxic heavy metals | Fly ash from coal-based power plants contains toxic heavy metals such as lead and copper |
| Plastic waste | Renewology has been installing mobile plastic-waste-to-energy systems along tributaries of the Ganges to collect discarded plastic and convert it into fuel |
| Religious practices | Traditional religious practices, such as ritual bathing, leaving offerings, and the deposition of cremated or half-burnt bodies, contribute to pollution |
| Waterborne illnesses | Experts link pollution in the Ganges to India's high rate of waterborne illnesses, which kill an estimated 1.5 million children each year |
| Superbugs | Researchers have discovered the emergence of superbugs, or bacteria resistant to most commonly used antibiotics, in Ganges water samples |
| Pharmaceuticals | Studies have identified the presence of pharmaceutical and personal care products, such as caffeine, anti-inflammatory drugs, common antibiotics, beta blockers, antibacterials, and insect repellents, in the river |
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What You'll Learn
Untreated sewage and industrial waste
The Ganges River is a vital source of water for approximately 40% of India's population across 11 states, serving an estimated 500 million people. However, the river is severely polluted, primarily due to untreated sewage and industrial waste discharged into the river by numerous cities and towns along its banks.
Untreated Sewage
The disposal of untreated human sewage and animal waste is a significant contributor to the pollution of the Ganges River. Three-quarters of the sewage generated in the northern plains remains completely untreated before being discharged into the Ganges and its tributaries. Even in areas with effective sewage treatment plants, more than half are not operating efficiently. A review in 2022 found that only 37% of the 72,368 million liters per day (MLD) of sewage generated is treated. The rapid urbanization and population growth in cities along the Ganges, such as Varanasi and Kolkata, have led to an increase in domestic waste, often surpassing the capacity of existing sewage treatment infrastructure. Traditional religious practices, such as ritual bathing, leaving offerings, and depositing cremated or partially burnt bodies, further contribute to the sewage load in the river.
Industrial Waste
Industrial waste, although accounting for a smaller volume, poses a significant concern due to its toxic and non-biodegradable nature. Various industries, including tanneries, chemical plants, textile mills, distilleries, slaughterhouses, and hospitals, discharge untreated industrial waste directly into the river. The city of Kanpur, for example, produces nine million liters of industrial waste daily, much of which is illegally dumped into the Ganges without treatment. Industrial effluents contain toxic heavy metals, such as lead and copper, and dangerous chemicals like chromium, cadmium, arsenic, mercury, and nickel. These pollutants have severe ecological and human health impacts, including waterborne diseases, accumulation of heavy metals in food sources, and threats to endangered species like the Ganges river dolphin.
The Indian government has recognized the urgency of addressing the pollution in the Ganges River. Initiatives like the Namami Gange project and the National Mission for Clean Ganga aim to invest in infrastructure to treat sewage and industrial waste throughout the river's catchment area. However, these efforts have faced challenges and have not yet yielded significant results. The pollution of the Ganges River remains a critical issue that requires effective and sustainable solutions to protect the health and well-being of the millions of people and diverse wildlife that depend on it.
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Religious practices and cremation
The Ganges River, also known as Ma Ganga or Mother Ganges, is revered as the lifeblood of India and holds a profoundly sacred and central place in Indian culture and spirituality. It is the most sacred Indian river, embodying a deep historical and cultural continuity for the country. It is also a vital source of water for over 40% of India's billion-plus population.
However, the Ganges has become one of the most polluted waterways in the world due to various anthropogenic activities, including religious practices and cremation rituals. Traditional Hindu beliefs hold that being cremated on the banks of the Ganges and allowing the ashes or half-burnt bodies to float down the river will cleanse the sins of the deceased and carry them directly to salvation. In the Hindu holy city of Varanasi alone, an estimated 40,000 bodies are cremated each year and deposited into the Ganges. Many of these bodies are not fully cremated, as wood for funeral pyres is expensive, and this practice adds to the pollution load in the river.
To address this issue, electric crematoria have been constructed next to the ghats in Varanasi and other holy riverside towns as an alternative to traditional wooden pyres. These facilities help reduce river pollution and preserve the limited supply of wood for funeral pyres.
In addition to cremation practices, other religious activities contribute to the pollution of the Ganges. Devotees offer prayers and make offerings of flowers, food, coins, milk, and organic ashes to the river as part of their worship. During the grand evening prayers in places like Haridwar and Varanasi, an estimated 20 quintals of floral waste are disposed of in the river daily, with this amount increasing four to five times in the month of Shrawan (July-August).
The accumulation of waste and pollutants in the Ganges has severe consequences for human health and the environment. The river's water is considered unsafe for drinking and bathing due to the presence of toxic chemicals, heavy metals, and pathogens. Waterborne illnesses are common, and the emergence of antibiotic-resistant bacteria in Ganges water samples has been observed. The pollution also poses risks to aquatic life, with the accumulation of toxic heavy metals in food sources like fish and the rapid decline or local extinction of native fish species.
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Population growth and urbanisation
Population growth and rapid urbanisation have led to an increase in pollution in the Ganges River. The river flows through 29 cities with populations of over 1 million people, as well as 100 cities with populations exceeding 100,000 residents, 97 cities with populations between 50,000 and 100,000 residents, and about 48 towns. This high population density has resulted in a large volume of sewage and waste being discharged into the river. It is estimated that 37 billion litres of untreated sewage flow into the river daily, with about 75% of the pollution coming from municipal sewage. The sewage contains high levels of organic waste and coliform bacteria, as well as toxic heavy metals and plastic waste.
The increasing population along the Ganges has also led to a higher demand for water, which has resulted in excessive water extraction for irrigation, drinking, and other general needs. This has reduced the river's flow and impacted its ability to dilute and absorb pollutants. Dams and pumping stations constructed for irrigation and drinking water have further diminished the river's flow, particularly during dry seasons.
Urbanisation has also contributed to the increase in industrial waste being dumped into the river. Several industrial cities, such as Kanpur, Prayagraj, Varanasi, and Patna, are located on the banks of the Ganges, along with tanneries, chemical plants, textile mills, distilleries, slaughterhouses, and hospitals. These cities and facilities discharge untreated industrial waste, including toxic and non-biodegradable effluents, into the river. The burning of coal in power plants has also contributed to the pollution, with fly ash containing heavy metals being released into the water.
The combination of population growth and urbanisation has resulted in a strain on the infrastructure, leading to inadequate waste management systems and higher levels of pollutants in the river. This has had profound consequences, including severe human health risks, ecological degradation, and negative impacts on vulnerable communities dependent on the river for their livelihoods.
Despite efforts to clean up the river, such as the Namami Gange project, the pollution in the Ganges remains a critical issue that requires equitable policies and inclusive solutions to protect both the human population and the diverse species that rely on its waters.
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Agricultural demands
The Ganges River is considered sacred in Hindu tradition and is revered as the Mother Goddess Ganga. It is a vital source of water for over 40% of India's population, providing water to nearly half a billion people. However, the river is highly polluted, with untreated sewage, industrial waste, and agricultural runoff being the main contributors.
Agricultural activities contribute significantly to the pollution load of the Ganges River through the introduction of various chemical substances. The key pollutants originating from farming include fertilizers, pesticides, and herbicides. These substances enter the river primarily via "run-off from agricultural fields carrying chemicals and fertilizers". The widespread application of these materials means that most of the chemical fertilizers, herbicides, and pesticides used in farming eventually end up in the river.
The use of river water for irrigation can also act as a pathway, potentially recirculating contaminants or washing excess agrochemicals from the land into the watercourse. The application of "excess agrochemicals and commercial fish feed" can exacerbate this contamination problem in connected agro-ecological areas. The influx of agricultural pollutants has detrimental effects on the Ganges' water quality and aquatic ecosystems, causing eutrophication and oxygen depletion, and introducing toxic pollutants harmful to aquatic life.
Faced with dwindling fish stocks, fishermen may be forced into "illegal fishing" practices or require "alternative livelihood options." Additionally, agricultural demands can lead to the excessive extraction of water from the Ganges for irrigation, further reducing the river's flow and capacity to dilute and absorb pollutants. Climate change also contributes to reduced water flows, worsening the impact of pollution.
Some organizations, such as Help Us Green, are working to address the issue of agricultural pollution in the Ganges. They recycle chemical-doused flowers and other temple debris that would otherwise end up in the river, making a significant impact on reducing pollution levels. Despite these efforts, the agricultural demands on the Ganges continue to pose a significant challenge to maintaining the river's health and ecological balance.
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Plastic and chemical pollution
The Ganges River, the largest river in India, is a vital source of water for approximately 40% of the country's population across 11 states. However, it is facing significant challenges due to rapid urbanization, agriculture, and industrial activities. Plastic and chemical pollution are among the key concerns threatening the health of the river and those who depend on it.
Plastic pollution in the Ganges is a growing problem with far-reaching ecological and health implications. The river receives an influx of microplastics (MPs), tiny plastic particles smaller than 5 mm, from various sources, including urban runoff, industrial discharges, agricultural land, and human activities. These microplastics are ingested by aquatic organisms, causing physical harm and exposing them to chemicals. The accumulation of toxins can disrupt food webs and biodiversity in the river ecosystem. Polyethylene, derived from discarded plastic bags, food packaging, and milk bottles, is the most abundant type of waste found in the river.
The presence of toxic plastics in the Ganges is not limited to microplastics. Larger plastic items such as fishing nets, bottles, and bags also contribute to the pollution. These items break down into smaller pieces, further adding to the microplastic burden. The improper management of solid waste exacerbates the problem, as untreated waste, industrial effluents, and urban runoff carry plastics into the river.
Chemical pollution in the Ganges is another critical issue. Industrial cities along the river, such as Kanpur, release untreated waste containing toxic chemicals into the water. The leather industry in Kanpur, for example, uses toxic chromium compounds, and despite the establishment of a treatment plant, chromium levels in the river remain alarmingly high. Additionally, agricultural runoff carries chemicals, fertilizers, pesticides, and herbicides into the river, negatively impacting water quality and aquatic ecosystems.
The consequences of plastic and chemical pollution in the Ganges are severe. The river's health is deteriorating, and the pollution poses significant risks to human health and vulnerable communities who depend on the river for their livelihoods. The accumulation of toxic heavy metals in food sources like fish and vegetables is a particular concern.
Despite efforts to clean up the river, such as the Namami Gange project, the pollution persists. Community awareness, sustainable water use, and proper waste management are being promoted to address the plastic and chemical pollution in the Ganges. Additionally, initiatives like Help Us Green in Kanpur aim to recycle chemical-doused flowers and temple debris that would otherwise end up in the river.
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Frequently asked questions
The main pollutants in the Ganges River are untreated sewage, industrial waste, and plastic waste.
Sewage pollution in the Ganges River is caused by the disposal of human and animal waste. Three-quarters of the sewage generated in the northern plains remain untreated before being discharged into the river and its tributaries. Sewage also contributes to chemical pollution, as people flush medicines, cosmetics, and hygiene products down the toilet.
Industrial waste from factories and power plants on the banks of the Ganges is dumped directly into the river. Industrial effluents account for about 12% of the total volume of waste reaching the Ganges and often contain toxic heavy metals such as lead and copper.
Plastic waste from temples and other sources ends up in the river, with an estimated 1,000 tonnes of plastic waste entering the river every day. Plastic waste not only pollutes the river but also poses a threat to the wildlife that inhabits it.
