Greta Jimenez
The Ganges River, also known as the Ganga River, is revered worldwide and provides water to approximately 40% of India's population across 11 states, serving an estimated 500 million people. However, it is also one of the most polluted rivers globally, facing severe challenges due to human activity and population growth. The three main sources of pollution in the Ganges are untreated human sewage and animal waste, industrial waste, and agricultural runoff.
| Characteristics | Values |
|---|---|
| Human sewage | 37 billion liters of untreated sewage flow into the river daily |
| Animal waste | N/A |
| Industrial waste | Toxic and non-biodegradable |
| Population growth | 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 |
| Religious practices | Ritual bathing, leaving offerings, and the deposition of cremated or half-burnt bodies |
| Water extraction | Water is extracted for farming, irrigation, and other uses, disrupting the river's natural flow |
| Dams and pumping stations | Reduce the river's flow, especially in dry seasons |
| Climate change | Contributes to reduced water flow |
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What You'll Learn
Human sewage and animal waste
The Ganges River, also known as the Ganga River, is revered by many as a holy and pure waterway. However, it is also one of the most polluted rivers in the world, posing significant threats to human health and the environment. One of the main causes of water pollution in the Ganges is the disposal of human sewage and animal waste.
The river flows through numerous cities and towns, with a combined population of over 400 million people, and serves as a source of water for approximately 500 million people. This high population density contributes to the large volume of sewage and waste that ends up in the river. It is estimated that 2.9 billion liters of wastewater from sewage, domestic, and industrial sources are dumped directly into the Ganges daily, with over 80% of this being sewage discharge from 50 cities along the river.
A significant portion of this sewage remains untreated before being discharged into the river and its tributaries. A 2022 review indicated that only 37% of the 72,368 million liters per day of sewage generated is treated. This untreated sewage contains high levels of organic matter and fecal coliform bacteria, which can lead to waterborne illnesses and pose a serious risk to public health. The presence of fecal coliform bacteria indicates contamination with the fecal material of humans or other warm-blooded animals, which can enter the river through the discharge of untreated sewage.
The pollution in the Ganges has been linked to India's high rate of waterborne illnesses, which kill approximately 1.5 million children each year. In addition, researchers have discovered the emergence of antibiotic-resistant bacteria, or "superbugs," in water samples from the river. The disposal of human sewage and animal waste into the Ganges is not only a health hazard but also an aesthetic insult to what Indians consider their most sacred river.
Several initiatives have been undertaken to address the pollution in the Ganges, including the Ganga Action Plan and the Namami Gange Programme. However, these efforts have had limited success, and the river remains severely polluted by human sewage and animal waste.
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Industrial waste
The Ganges River, also known as the Ganga River, is revered worldwide as one of the most sacred waterways. Stretching from the Himalayan foothills to the Bay of Bengal, it provides water to approximately 40% of India's population across 11 states, serving an estimated 500 million people—more than any other river globally.
Despite its significance, the Ganges faces severe pollution, primarily from untreated human sewage, animal waste, and industrial waste. While accounting for a smaller volume, industrial waste is a critical concern due to its toxic and non-biodegradable nature. Various industries along the river's banks dump untreated effluents directly into the river. These industries include tanneries, chemical plants, textile mills, distilleries, slaughterhouses, and hospitals. The toxic waste from these sources contains harmful substances such as heavy metals, fertilizers, pesticides, and herbicides, which contribute to eutrophication, oxygen depletion, and the introduction of toxic pollutants that endanger aquatic life.
One notable example of industrial pollution in the Ganges is the issue with tanneries in Kanpur. The leather industry in this city has left the riverbanks littered with detritus, including offcuts of leather, scraps of hide, and other animal matter. The waste from these tanneries is often dumped into open drains that flow directly into the Ganges, posing a significant environmental and health hazard.
Additionally, a coal-based power plant on the banks of the Pandu River, a tributary of the Ganges, burns 600,000 tons of coal annually and produces 210,000 tons of fly ash. This ash is disposed of in ponds, creating a slurry that mixes with domestic wastewater before being released into the Pandu River. The concentration of copper in the Pandu River, before it even reaches the Ganges, is a thousand times higher than in uncontaminated water, demonstrating the toxic nature of industrial waste.
The industrial waste discharged into the Ganges has severe consequences for both human health and the environment. Waterborne illnesses are prevalent, and the accumulation of toxic heavy metals in food sources like fish and vegetables poses risks to those who depend on the river for sustenance. The pollution also leads to ecological degradation, threatening native fish species and endangered creatures like the Ganges river dolphin and softshell turtle.
Addressing the issue of industrial waste in the Ganges requires comprehensive solutions that involve infrastructure development, sustainable practices, and improved monitoring. While initiatives like the Namami Gange Programme have been implemented, success has been limited, emphasizing the need for integrated approaches that can effectively tackle the complex challenge of reducing industrial pollution in the sacred and vital Ganges River.
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Population growth
The main issue, as explained by Dr. Hussain, who supervises the Biodiversity Conservation and Ganga Rejuvenation program, is population growth. The increasing population density along the river's banks results in a higher volume of wastewater and waste discharge into the river. The river flows through numerous cities and towns, with a significant number of residents, and about 75% of the pollution in the Ganga comes from municipal sewage from these urban areas.
The rapid urbanisation driven by migration strains the infrastructure, leading to insufficient sewage treatment capacities. This results in higher levels of untreated effluents entering the river. The sewage contains high levels of organic waste, including coliform bacteria, which poses severe human health risks and contributes to ecological degradation.
Furthermore, population growth drives the need for more agricultural practices, which impacts the river. Water is extracted from the river for irrigation, and during the dry season, dams take up to 90% of the water that flows down, reducing the river's flow and its ability to dilute and absorb pollutants. This is exacerbated by the receding Himalayan glaciers, shorter rainy seasons, and longer dry spells, which reduce the river's water levels.
The pollution in the Ganges has severe consequences for human health, with India's high rate of waterborne illnesses killing approximately 1.5 million children annually. Additionally, the accumulation of toxic heavy metals in food sources like fish and vegetables poses risks to those dependent on the river for their livelihoods. The river is also home to endangered species such as dolphins, otters, crocodiles, and freshwater turtles, whose survival is threatened by the pollution and riverbank development.
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Religious practices
The Ganges River, also known as Ma Ganga or Mother Ganges, is a goddess in Hinduism. It is the National River of India and is considered the holiest river in the world. The river is a vital source of water for over 40% of India's population, serving an estimated 500 million people.
However, the river is highly polluted, threatening both human health and the environment. Traditional religious practices, such as those outlined below, are contributing factors to the river's pollution.
Ritual bathing
Ritual bathing is one of the most prominent religious activities associated with the Ganges. Hindus consider the river's waters to be healing and travel from all over the world to bathe in them as part of their rituals. The largest gathering of humans on the planet occurs every 12 years in the city of Allahabad on the banks of the river. During the Kumbh Mela festival, the central ritual is bathing in the Ganges to achieve moksha (a type of spiritual release). In 2001, over 30 million pilgrims attended.
Leaving offerings
Hindus also leave offerings in the river as part of their religious practices. These offerings can include containers of river water, taken back to their homes for rituals or healings.
Deposition of cremated or uncremated bodies
Each year, around 30,000–32,000 bodies are cremated in Varanasi, and their ashes are given to the Ganges. Those who cannot afford cremation wrap the body and float it down the river. This practice further adds to the river's pollution load.
While religious practices contribute to the pollution of the Ganges, it is important to note that population growth, industrial waste, agricultural runoff, and climate change are also significant factors. The combination of these factors has led to severe human health risks, ecological degradation, and a decline in the river's ability to support vulnerable communities dependent on it for their livelihoods.
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Agricultural runoff
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 across 11 Indian states. However, it is also one of the most polluted rivers globally, posing significant threats to human health and the environment.
The impact of agricultural runoff is influenced by various factors, including land use, soil chemistry, topography, and geological parent material. For example, the site-specific variations in nutrient concentrations in the runoff water were observed in studies, indicating that local factors significantly influence the pollution levels. Additionally, the intensity of human activities in the catchment area affects the magnitude of nutrient loading in the river.
To mitigate the effects of agricultural runoff, sustainable farming practices have been proposed. These include conservation agriculture, crop rotation, and the use of organic fertilizers. By implementing these practices, nutrient pollution and agricultural runoff can be minimized, preserving the health of the river and the aquatic ecosystems it supports.
Despite numerous initiatives, including the Ganga Action Plan and the Namami Gange Programme, significant success in cleaning the river has been limited. This highlights the complexity of the challenge and the need for integrated solutions involving infrastructure, sustainable practices, and improved monitoring of agricultural activities that contribute to runoff.
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