Brian Barton
India's water crisis is a significant issue, with water pollution causing detrimental effects on both the environment and public health. The country's rapid urbanization, combined with inadequate infrastructure and sewage control, has resulted in contaminated water sources and a decline in water quality. Around 70% of wastewater goes untreated, with industrial wastewater, agricultural runoff, and untreated sewage being the largest sources of water pollution. This has led to severe health issues, with 38 million Indians suffering from waterborne diseases and 500 children under five dying from diarrhea daily. The economic impact is also substantial, with a loss of $80 billion annually due to environmental degradation and a reduction in agricultural revenues in polluted areas. While efforts are being made to improve the situation, such as the installation of water treatment plants and innovative solutions by startups, India still faces significant challenges in providing safe and clean water to its vast population.
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What You'll Learn
Sewage and waste management
The largest source of water pollution in India is untreated sewage. It is estimated that around 70% of wastewater goes untreated, with approximately 40 million litres of wastewater flowing into India's lakes, rivers, and oceans daily. This untreated sewage contains infectious bacteria and diseases, rendering the water unfit for consumption and irrigation. As a result, water pollution severely limits the amount of water available for Indian consumers, agriculture, and industry.
The gap between sewage generation and treatment capacity in India is significant. Major cities produce 38,354 million litres of sewage daily, while the urban sewage treatment capacity is only 11,786 million litres. This disparity is due to insufficient treatment capacity and poorly maintained or non-operational sewage treatment plants. The waste accumulates in urban areas, causing unhygienic conditions and further polluting surface and groundwater.
To address this issue, India has been adopting advanced sewage wastewater treatment technologies. Private-public collaborations have been encouraged, attracting private investment and introducing more advanced technology and customized solutions. The government has also implemented financial mechanisms to fund sewage treatment projects, such as the Hybrid Annuity Model (HAM) under the National Mission for Clean Ganga (NMCG). Since 2005, the Indian wastewater treatment plant market has been growing at a rate of 10-12% annually, and it is estimated that India will nearly triple its water treatment capacity by 2015.
In addition to centralized sewage treatment plants, India has also installed decentralized systems such as reverse osmosis and solar electrolytic defluoridation plants. Local startups and water companies are also contributing to the efforts by building water reuse plants across the country. However, it is important to carefully select the appropriate technologies that best meet local needs and ensure proper maintenance to avoid potential drawbacks.
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Industrial pollution
India's industrial sector is a major contributor to water pollution, particularly in rivers. The Central Pollution Control Board reported that in 2016, there were 746 industries directly depositing wastewater into the Ganga River, the largest river in India. This wastewater contains high levels of pollutants such as lead, cadmium, copper, chromium, zinc, and arsenic, which have detrimental effects on aquatic life and human health. The bioaccumulation of these metals can lead to cognitive impairment, gastrointestinal damage, and renal damage in humans.
In addition to heavy metals, pesticides, and industrial chemicals, untreated industrial wastewater also introduces pathogens and harmful microorganisms into water bodies, further contaminating them. This contamination has severe health consequences, particularly for children who are vulnerable to waterborne infections. Waterborne diseases such as cholera, typhoid, and hepatitis are prevalent in India, causing illness, hospitalization, and even death among those exposed to polluted water sources.
The Indian government has recognized the severity of the situation and has taken steps to address the issue. In 2015, the government installed thousands of reverse osmosis systems and solar electrolytic defluoridation plants in various states. Additionally, local startups and companies have contributed to the development of innovative water filters that effectively remove dangerous microorganisms at a low cost. These efforts have positively impacted millions of people in India, providing them with access to cleaner water sources.
However, despite these efforts, industrial pollution continues to be a significant challenge. The treatment of industrial wastewater and the enforcement of regulations remain inadequate. For example, while it is mandatory to treat industrial effluent, water pollution levels indicate that this is not strictly adhered to or enforced. As a result, industrial pollution continues to degrade water quality, limiting the amount of water available for consumption, industry, and agriculture. The economic impact of water pollution is also significant, with a loss of $80 billion annually in environmental degradation and health costs associated with treating waterborne diseases.
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Agricultural runoff
India's water crisis is a well-known issue, with the country's growing population and rapid urbanization putting immense pressure on its water resources. While untreated sewage is the largest source of water pollution in India, agricultural runoff is also a significant contributor.
During the monsoon season or periods of heavy rainfall, fertilizers and pesticides applied to agricultural lands are washed off and enter nearby rivers, lakes, and other water sources. This leads to a form of pollution known as eutrophication, characterized by high levels of nutrients that promote excessive growth of algae and other aquatic vegetation. Eutrophication can result in reduced oxygen levels in the water, creating "dead zones" where aquatic life cannot survive.
In addition to eutrophication, agricultural runoff in India has also led to the introduction of agrochemicals, such as Dichlorodiphenyltrichloroethane (DDT) and Hexachlorocyclohexane (HCH), into water bodies. These chemicals are resistant to degradation and can accumulate in the environment, leading to potential bioaccumulation. Bioaccumulation refers to the process where certain substances, like DDT and HCH, build up in the tissues of living organisms over time. These agrochemicals are classified as Persistent Organic Pollutants (POPs), which have been linked to potential carcinogenic and mutagenic effects. According to the World Health Organization (WHO), the levels of POPs found in several Indian rivers exceed the permissible limit, indicating a severe health risk for the population.
Moreover, agricultural runoff in India is not limited to surface water pollution. High nitrate concentrations have been detected in groundwater, particularly in regions like Punjab and Haryana, which have been linked to agricultural sources. The overuse of nitrogen-based fertilizers in agriculture has resulted in increased nitrogen pollution in India's water resources. While riverine nitrogen runoff has been relatively stable despite rising fertilizer application rates, groundwater and atmospheric emissions have been significantly impacted. This suggests that agricultural intensification is contributing to the deterioration of groundwater quality, which is a crucial source of drinking water for many rural and semi-urban areas in India.
To address the issue of agricultural runoff, India has taken several steps. The government has implemented initiatives like the installation of reverse osmosis systems and solar electrolytic defluoridation plants to improve access to clean water. Local startups have also contributed to the efforts by developing innovative water filters. Additionally, India has prepared the National Implementation Plan (NIP) under the Stockholm Convention to tackle the issue of POPs contamination. However, more comprehensive data and effective interventions are needed to address the complex nature of water pollution in India fully.
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Water scarcity
The primary sources of water pollution in India are untreated sewage, agricultural runoff, and unregulated small-scale industries. The majority of government-owned sewage treatment plants remain closed due to poor maintenance, lack of electricity, and absentee employees. As a result, an estimated 70% of wastewater goes untreated, with 40 million liters of wastewater flowing into India's lakes, rivers, and oceans daily. This has contaminated surface water and groundwater, causing waterborne diseases and affecting agriculture.
The Indian government has taken several steps to address water scarcity and pollution. They have implemented initiatives such as the Atal Bhujal Yojana, a community-led groundwater management program, and the "Paani Bachao, Paisa Kamao" scheme, which incentivizes farmers to reduce groundwater usage. Additionally, India has seen an annual growth of 10-12% in the wastewater treatment plant market since 2005, with the United States as the largest supplier of treatment equipment.
Despite these efforts, water scarcity persists in India. The growing middle class and industrialization have increased the demand for clean water, while the country's water sources continue to deplete. Climate change further exacerbates this issue, with erratic monsoons, droughts, and rising sea levels affecting water availability.
Access to safe water and sanitation is a significant challenge, with 35 million people lacking access to safe water and 678 million lacking access to safe toilets. Women and children often bear the responsibility for water collection, spending time and money to secure water for their daily needs. This has led to the emergence of "tanker mafias," who illegally sell water from lakes, wells, and groundwater at unaffordable prices for most Indians.
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Health impacts
Water pollution in India has severe health consequences for the population. It is estimated that around 70% of surface water in India is unfit for consumption. The water is contaminated with pollutants such as heavy metals, pesticides, and industrial chemicals, which are harmful to human health. These pollutants can cause bioaccumulation, acting as potential carcinogens and mutagens. The levels of Persistent Organic Pollutants (POPs) found in several Indian rivers are well above the WHO permissible limit.
The largest source of water pollution in India is untreated sewage, with major cities producing 38,354 million litres of sewage per day, far exceeding the urban sewage treatment capacity of 11,786 million litres per day. This untreated sewage contains harmful bacteria and infectious diseases, causing around 38 million Indians to suffer from waterborne illnesses such as typhoid, cholera, and hepatitis each year. The situation is exacerbated by poor infrastructure and the absence of sewage control, leading to a decline in water quality and scarcity.
Agricultural runoff is another significant contributor to water pollution in India. Pesticides and fertilizers contaminate water sources, affecting both human health and soil fertility. High levels of contaminants such as arsenic and fluoride have been found in groundwater in many parts of India, posing severe health risks to those who rely on groundwater for drinking. The use of untreated wastewater for irrigation further exposes farmers and their families to harmful sewage-borne microorganisms and heavy metals, with potential health consequences.
Water pollution in India also impacts food security. The contamination of water sources and the decline in soil fertility lead to reduced crop yields. This results in a shortage of safe and nutritious food for the growing population. The economic impact of water pollution includes healthcare costs for treating waterborne diseases, estimated at almost $9 billion per year. The frequency of these illnesses has remained constant over the last decade, highlighting the ongoing challenge posed by water pollution in India.
To address these health impacts, India is taking steps to improve water quality. Efforts include implementing new technologies, such as flocculation and the reuse of industrial water, and the establishment of water treatment plants by companies like VA Tech Wabag. These initiatives aim to increase the availability of clean water and mitigate the health risks associated with water pollution in India.
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Frequently asked questions
It is estimated that around 70% of surface water in India is unfit for consumption.
The largest source of water pollution in India is untreated sewage, with around 70% of wastewater going untreated. Other sources of pollution include agricultural runoff, unregulated small-scale industry, and industrial pollution.
The Indian government has been working to address water pollution through initiatives such as the Ganga Action Plan (GAP) and the National River Conservation Plan. In 2015, the government also installed thousands of reverse osmosis systems and solar electrolytic defluoridation plants.
Water pollution in India has led to an increase in waterborne diseases such as typhoid, cholera, and hepatitis, with 38 million Indians affected annually. It is also estimated that more than 1.5 million Indian children die from diarrhea each year.
Water pollution in India has led to a decrease in agricultural revenues and an increase in health costs. The environmental degradation caused by water pollution results in an estimated loss of $80 billion annually.
