Brian Barton
The Ganges River is revered by Hindus and is a vital water source for around 500 million people in India, providing water to approximately 40% of the country's population. However, it is one of the most polluted waterways in the world, posing significant threats to human health and the environment. The primary source of pollution is untreated human sewage, with nearly 37 billion litres flowing into the river daily. This is due to the high population density in the region, with the river running through numerous cities and towns along its banks. The disposal of human waste into the Ganges is a significant issue, with a large proportion of the sewage originating from domestic water usage and contributing to high levels of disease-causing bacteria in the river.
| Characteristics | Values |
|---|---|
| Main Causes of Pollution | Disposal of untreated human sewage, industrial waste, agricultural runoff, animal waste, increasing population density, and the deposition of cremated bodies |
| Population Impact | The river flows through 100 cities with populations of over 100,000 people, 97 cities with populations of 50,000-100,000 people, and about 48 towns |
| Volume of Untreated Sewage | 37 billion litres of untreated sewage flow into the river daily |
| Proportion of Untreated Sewage | Three-quarters of all sewage generated in the northern plains remains completely untreated before being discharged into the river and its tributaries |
| Bacteria Levels | Faecal coliform bacteria in the water at Prayagraj during the 2025 Kumbh Mela was 1400 times above the permissible limit |
| Success of Initiatives | The Namami Gange project has spent an estimated $460 million with little success; the Ganga Action Plan and the National Mission for Clean Ganga have also had limited success |
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What You'll Learn
Population growth and migration
The Ganga basin is characterised by extremely high demographic and economic growth rates, with rapid urbanisation and migration from rural areas to cities like Varanasi and Kolkata along the river basin. This population growth and migration lead to an increased volume of wastewater and waste discharge into the river. The influx of domestic and industrial waste often surpasses the capacity of existing sewage treatment facilities, resulting in higher levels of untreated effluents entering the Ganga.
The river flows through numerous cities and towns, with 29 cities having populations of over 1 million people. This high population density contributes significantly to the pollution of the river, as approximately 75% of the Ganga's pollution comes from municipal sewage. The disposal of human sewage and animal waste, as well as industrial waste, are the main causes of water pollution in the river. The rapid industrialisation and population growth in the basin have increased the release of industrial and domestic effluents, compromising water quality.
The population in the Ganga basin is expected to continue growing, along with the number of industries and urban settlements. This will generate a higher demand for water, further deteriorating water quality. The river has already lost its ability to clean itself and maintain its ecological flow due to human diversion for agriculture and other needs. The increasing population density and migration patterns contribute to the strain on the river's ecosystem and the challenge of managing pollution effectively.
To address these issues, the Indian government has launched several initiatives, including the Ganga Action Plan (GAP) and the Namami Gange Programme. These programmes aim to improve water quality, treat domestic sewage, and prevent toxic industrial waste from entering the river. However, despite these efforts, significant success in cleaning the river has been limited, and critics argue that more urgent action is needed to restore the river's health and protect its biodiversity.
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Religious practices
The Ganges River is sacred to Hindus, who refer to it as Mother Goddess Ganga. It is believed to have healing powers, and bathing in the river is thought to wash away a person's sins and bring salvation. As a result, ritual bathing is a common practice among Hindus. However, this religious tradition contributes to the river's pollution, as large volumes of untreated sewage are released into the river daily.
Another religious practice that impacts the river's pollution is the offering of materials to the Ganges as a form of worship. Devotees leave various items such as food, waste, and leaves in the river as offerings, which accumulate and contribute to the debris in the water.
The traditional Hindu custom of cremating the dead on the river banks is also a significant source of pollution. According to Hindu beliefs, being cremated on the banks of the Ganges and having one's ashes flow down the river will cleanse the sins of the deceased. In the holy city of Varanasi alone, around 40,000 bodies are cremated annually and then deposited into the river. Due to the high cost of cremation wood, many bodies are only partially burned, leading to remnants of unburned or partially burned bodies ending up 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.
The religious significance of the Ganges and the devotion it inspires among its worshippers present unique challenges in addressing the pollution issue. While various initiatives and projects have been undertaken, including the Namami Gange project and the Ganga Action Plan, the river's vast size and diverse sources of pollution make it a complex task to restore it to a clean and healthy state.
The Ganges River is also significant to Buddhists, who view it as a sacred being with rights equivalent to those of Ascendant beings. The river is believed to be the goddess of purity who washes away all sins, and temples dedicated to her can be found at the headwaters of the Ganges. However, the pollution of the river contradicts this belief in its purity, creating a conflict between religious mythology and the reality of the contaminated state of the Ganges.
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Industrial waste
While industrial waste accounts for a smaller volume of pollution in the Ganges compared to other sources, it is a significant concern due to its toxic and non-biodegradable nature. Industrial cities, tanneries, chemical plants, textile mills, distilleries, slaughterhouses, and hospitals line the banks of the river, dumping untreated waste directly into it. This waste includes dangerous chemicals, heavy metals, and toxic compounds that fill the waters at levels far exceeding safe limits. For example, the concentration of copper in the Pandu River, a tributary of the Ganges, is a thousand times higher than in uncontaminated water due to the discharge from a coal-based power plant.
The tannery industry, particularly in North India, has converted the Ganges into a dumping ground for liquid effluents containing organic matter and toxic chemicals such as chromium, cadmium, arsenic, mercury, and sulfuric acid. Kanpur, a highly polluted city along the Ganges, produces nine million liters of industrial waste daily, primarily consisting of wastewater from tanneries that is dumped illegally without treatment. The clustering of tanneries in this region further exacerbates the pollution problem.
Other industrial effluents account for about 12% of the total volume of waste reaching the Ganges. These effluents contain hazardous materials such as hydrochloric acid, mercury, heavy metals, bleaches, dyes, pesticides, and highly toxic compounds. These toxins have contaminated groundwater and crops irrigated with water from the Ganges. The discharge of industrial waste has led to the death of fish and aquatic creatures, with stretches of the Yamuna tributary devoid of any aquatic life.
The pollution from industrial waste is aggravated by the lack of dilution capacity in the river, making the pollution even more toxic and hazardous. This has rendered the Ganges dangerous for drinking or bathing, with heavy metals and toxic substances accumulating in animal and human tissue, leading to serious health complications such as kidney damage, brain damage, various cancers, and even spontaneous abortions.
To address this issue, there have been proposals to implement zero-discharge technologies and make Common Effluent Treatment Plants (CETP) mandatory for all industries discharging untreated effluent into the Ganges. However, enforcement of these laws and regulations remains a challenge.
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Agricultural runoff
The Ganges River, India's largest river, is a vital water source for an estimated 500 million people. However, the river is facing significant pollution issues that threaten both human health and the environment. One of the main contributors to this pollution is agricultural runoff.
The use of harmful chemicals and pesticides in agriculture has severe ecological and health impacts. These toxic substances, including DDT and HCH, are washed into the river, posing risks to anyone who uses the water for drinking, bathing, or cooking. They also harm aquatic life, with studies showing that these chemicals are killing large populations of fish and other aquatic organisms. Additionally, the presence of these chemicals in the water can lead to bioaccumulation, as they are fat-soluble, further endangering human and animal health.
Fertilizer runoff contributes to eutrophication, an ecological process triggered by the excessive enrichment of water bodies with nutrients. This leads to an overproliferation of algae, which deoxygenates the water. The reduced oxygen levels have detrimental effects on the fish and other aquatic organisms living in the water system, disrupting the environmental balance.
To address the issue of agricultural runoff, sustainable farming practices are being promoted. This includes encouraging conservation agriculture, crop rotation, and the use of organic fertilizers to minimize pollution. There is a push toward educating farmers about the benefits of sustainable and organic farming methods, as well as implementing policies to prevent toxic chemical runoff from entering the river. Additionally, wastewater management plans are being developed to treat and reuse wastewater for non-potable purposes, reducing water diversion from vulnerable ecosystems.
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Sewage treatment infrastructure
One of the main challenges in reducing sewage pollution in the Ganges is the high population density in the region. The river flows through many cities and towns, and the large population contributes a significant amount of sewage and wastewater to the river. It is estimated that nearly 37 billion litres of untreated sewage flow into the river daily, with about 75% of Ganga pollution coming from municipal sewage. This high volume of sewage has overwhelmed the existing sewage treatment infrastructure, leading to higher levels of untreated effluents entering the river.
To address this issue, there have been calls for investing in substantial new infrastructure to treat sewage and industrial waste throughout the Ganges' catchment area. This includes the construction of new sewage treatment plants (STPs) and effluent treatment plants (ETPs). For example, the World Bank Group has partnered with the National Mission for Clean Ganga (NMCG) to support the development of STPs along the Ganga through public-private partnerships (PPPs). This includes the innovative Hybrid-Annuity Model (HAM), where the government assumes all payment responsibilities, addressing bankability issues and attracting private investment.
In addition to constructing new treatment plants, there is also a focus on rehabilitating and augmenting existing STPs to improve their efficiency. This includes the use of solar power to augment and maintain existing plants. Furthermore, initiatives such as the Clean Ganga Program aim to increase wastewater treatment capacity and reduce the flow of untreated wastewater into the river. For example, in Mathura, Uttar Pradesh, a long-term offtake agreement was reached where Indian Oil will use treated wastewater to cool its refinery, saving 20 million litres of freshwater daily.
While these sewage treatment infrastructure initiatives have shown potential, it is important to note that the cleaning process is a long-term endeavour. The vast size of the river and the diverse sources of pollution make it a complex task to restore the Ganges to a clean and healthy state. Additionally, population growth and migration continue to strain infrastructure, requiring continuous improvement and investment in waste management systems.
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Frequently asked questions
The Ganges River is considered one of the most polluted waterways in the world. The primary source of pollution is the disposal of untreated human sewage, with nearly 37 billion litres of it flowing into the river daily.
Other sources of pollution in the Ganges River include industrial waste, agricultural runoff, and the disposal of human and animal remains.
The Indian government has launched several initiatives to address the issue, including the Ganga Action Plan (GAP) and the ongoing Namami Gange Programme. However, significant success in cleaning the river has been limited.
The Ganges River is revered by Hindus and is considered sacred. Traditional religious practices, such as ritual bathing, the deposition of cremated bodies, and the offering of materials to the river as a form of worship, contribute to the pollution.
