Meghan Hodges
India's rivers are some of the most polluted in the world, with over half of its 605 rivers contaminated by a range of pollutants. The largest river in India, the Ganga, is considered sacred by Hindus, yet it is also one of the most polluted rivers globally. The primary sources of river pollution in India are untreated sewage, industrial effluents, and agricultural runoff, which all contribute to the degradation of water quality and pose significant risks to human health and the environment. The problem is further exacerbated by India's rapid population growth and industrialization, with an estimated 7.17 million tonnes of hazardous waste produced by industrial plants from 2016 to 2017. The Indian government has attempted to address this issue, but the efforts have largely been unsuccessful, and river pollution in India remains a critical concern with far-reaching consequences.
| Characteristics | Values |
|---|---|
| Source of pollution | Untreated sewage, industrial discharge, agricultural runoff, and improper disposal of waste |
| Pollutants | Faecal coliform, heavy metals (lead, cadmium, copper, chromium, zinc, arsenic), pesticides, fluoride, mercury, beta-endosulphan, heptachlor, COD, BOD, ammonia, phosphate, chloride, nickel, selenium, chromium, chlorpyrifos |
| Polluted rivers | Ganga, Yamuna, Godavari, Cooum, Sabarmati, Bahela, Markanda, Kali, Amlakhadi, Betwa |
| Causes of river pollution | Population growth, rapid industrialization, poor waste management and segregation practices, religious practices, climate change |
| Effects of river pollution | Harm to aquatic life, decrease in drinking water sources, increase in deadly diseases like cancer |
| Initiatives to address river pollution | Namami Gange project, Ganga River Pollution Control Scheme, proposed solutions include demolishing/constructing upstream dams, building coastal reservoirs, investing in sewage and waste treatment infrastructure |
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What You'll Learn
Untreated sewage
The Ganges, India's largest and most sacred river, is a prime example of the devastating impact of untreated sewage. Over 450 million people live in the Ganges river basin, and human waste is the primary source of pollution. Approximately five billion litres of sewage flow into the river daily, with only a quarter of it being treated. By the time the river reaches Varanasi, it has become an open sewer, with faecal bacteria levels 150 times higher than the safe level for bathing.
The river's religious significance further exacerbates the problem. Hindus consider the Ganges a living goddess with healing powers, and many travel from around the world to bathe in its waters during religious festivals. Traditional rituals include cremating loved ones on the riverbanks and floating the ashes or half-burnt bodies in the river. While these practices contribute to pollution, efforts to address them are met with resistance from those who believe in the Ganges' ability to cleanse impurities.
The pollution in the Ganges has severe consequences for both human health and the environment. The river supplies water to approximately 40% of India's population across 11 states, serving an estimated 500 million people. The high levels of faecal coliform and toxic industrial waste in the river pose a significant threat to those who rely on it for drinking, bathing, and agricultural purposes.
To address the issue of untreated sewage, India needs to invest in substantial new infrastructure for sewage treatment. Proper waste management and strict rules regarding river pollution are essential to curb the devastating impact of sewage pollution on India's rivers.
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Industrial waste
The Ganga River, India's largest and most sacred river, is a stark example of the devastating impact of industrial pollution. Despite its religious significance to Hindus, the Ganga has become one of the most polluted rivers in the world. Industrial effluents, particularly from tanneries in Kanpur, have contaminated the river with toxic chemicals such as chromium compounds. These pollutants have severe ecological and health consequences, affecting both aquatic life and the millions of people who depend on the river for bathing, rituals, and even drinking water.
The Central Pollution Control Board (CPCB) reported that as of 2016, there were 746 industries directly depositing wastewater into the Ganga. This wastewater contains heavy metals such as lead, cadmium, copper, chromium, zinc, and arsenic, which are extremely harmful to both the environment and human health. The problem is not limited to the Ganga, as other major rivers like the Yamuna and Godavari also face severe industrial pollution.
The lack of proper waste treatment infrastructure and ineffective enforcement of environmental regulations have exacerbated the issue. While initiatives like the Namami Gange project have been launched to address river pollution, they have often fallen short of achieving significant results. The complexity of the issue lies in the intersection of cultural and religious factors, which makes finding a comprehensive solution challenging.
Additionally, India's rivers are facing the dual challenge of industrial pollution and population growth. With a rising population living in close proximity to river systems, the risk of untreated municipal solid waste and sewage leaking into rivers increases. This, coupled with industrial waste, poses a severe threat to biodiversity and aquatic life that these rivers support, as well as the health and well-being of the millions of people who rely on them.
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Agricultural runoff
The use of chemical fertilizers and pesticides in agriculture has become a common practice in India, and this has had detrimental effects on the country's rivers. Excessive use of nitrogen-based fertilizers, for example, has led to increased nitrogen pollution in rivers. While there is little correlation between rising fertilizer application rates and riverine runoff in some basins, agricultural intensification has impacted groundwater and atmospheric emissions. India's riverine nitrogen runoff is highly sensitive to changes in precipitation and the intensification of seasonal monsoons.
The impact of agricultural runoff extends beyond water pollution. It also affects soil fertility, leading to reduced crop yields and impacting food security. Additionally, contaminated water sources can result in waterborne diseases, including cholera, typhoid, and hepatitis, causing illness and even death among those exposed.
Addressing agricultural runoff requires a shift towards organic farming practices. By supporting farmers in adopting organic cultivation methods, India can reduce the amount of chemical pollutants entering its rivers. This approach not only benefits the environment but also improves soil health, increases farmer incomes, and positively impacts public health.
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Religious practices
India's rivers are the main source of water for the country, supplying around 90% of its water. However, the Central Pollution Control Board has warned that the water in half of the nation's rivers is unsafe to drink, and at least a quarter of the rivers cannot be used for bathing.
The Ganges is one of the most revered and most polluted rivers in India. It is a sacred site for Hindus, embodying a deep historical and cultural continuity for India. It is the focus of religious devotion for tens of millions of people worldwide and is considered the Mother Goddess Ganga herself. The river is also a vital source of water for more than 40% of India's population, serving an estimated 500 million people in 29 cities, 70 towns, and thousands of villages.
One of the main ways in which the Ganges is polluted is through religious practices. Ritual bathing is one of the most prominent religious activities associated with the river. Millions of people engage in this practice, particularly during festivals and large-scale gatherings, seeking purification and spiritual merit. For example, during the ancient Hindu festival of Chhath Puja, thousands of worshippers make offerings to the sun god Surya while standing waist-deep in the river.
Another religious practice that pollutes the river is the deposition of cremated or half-burnt bodies. Varanasi, a primary site for cremation, is described as the "spiritual center of Hinduism". Around 32,000 bodies are cremated each year in the city, resulting in 300 tons of ash and 200 tons of half-burnt human flesh being deposited into the river.
Other religious practices that contribute to the pollution of the Ganges include leaving offerings, immersing statues of deities, and floating the bodies of those who cannot afford cremation. These practices, combined with industrial and agricultural waste, have made the Ganges one of the most polluted rivers in the world.
Despite the river's severe pollution, it is still considered sacred by many Hindus, and they continue to drink and bathe in its waters as part of their faith. However, there have been calls from within the Hindu community for serious efforts to clean the Ganges, with some even going on hunger strikes to draw attention to the issue.
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Poor waste management
One major issue is the lack of proper sewage disposal systems and treatment facilities. Untreated sewage is discharged from cities, towns, and villages into rivers, resulting in high levels of organic and bacterial contamination. This is particularly evident in the Ganga river, where human waste from the approximately 450 million people living in the river basin is a significant source of pollution. Inadequate infrastructure exacerbates the problem, with only a quarter of the sewage treated before being released into the river. As a result, the river becomes an open sewer, with faecal bacteria levels far exceeding safe limits for bathing or drinking.
Industrial waste is another significant source of river pollution in India. Various industries dump untreated toxic waste into rivers, including heavy metals such as lead, cadmium, copper, chromium, zinc, and arsenic. The leather industry in Kanpur, for example, has been identified as a major contributor to the pollution of the Ganga river, with chromium levels exceeding recommended maximums by more than 70 times. Other industrial sectors, such as unregulated small-scale industries and tanneries, also contribute to the problem.
Agricultural runoff is also a significant factor in river pollution. Farming activities introduce chemical substances such as fertilizers, pesticides, and herbicides into water bodies, increasing nutrient loads and causing eutrophication, oxygen depletion, and the introduction of toxic pollutants harmful to aquatic life. Additionally, agrochemicals like Dichlorodiphenyltrichloroethane (DDT) and Hexachlorocyclohexane (HCH), which have been banned worldwide due to their environmental damage, are still commonly used in India and contribute to water pollution.
Religious and cultural practices also play a role in river pollution. The Ganges river, considered sacred in Hinduism, attracts millions of Hindu devotees who bathe in the river during festive seasons. Some materials, such as food, waste, and leaves, are left in the river, contributing to pollution levels. Additionally, traditional Hindu beliefs hold that cremating a body on the river's banks and allowing it to float downstream will cleanse the sins of the deceased. As a result, partially burnt or uncremated bodies are often disposed of in the river, further contaminating the water.
The consequences of river pollution in India are severe, posing risks to both human health and the environment. The pollution has led to a decrease in fresh drinking water sources, and the intake of contaminated water can cause deadly diseases, including cancer. It also disrupts the natural food chain by killing marine animals and affecting aquatic plants.
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Frequently asked questions
The main causes of river pollution in India are untreated sewage, industrial waste, and agricultural runoff.
The Ganga (or Ganges), Yamuna, Cooum, Sabarmati, and Bahela are among the most polluted rivers in India.
Efforts to address river pollution in India include the Namami Gange project, the Godavari River Pollution Control Scheme, and the proposal of new infrastructure to treat sewage and industrial waste. However, many of these initiatives have failed to produce significant results.
