Meghan Hodges
Waterways around the world are under threat from a variety of sources, including industrial waste, sewage, oil spills, agricultural runoff, and pharmaceutical pollution. A 2022 study found that out of 1,052 sites sampled, only two were free of pharmaceutical pollution. Rivers are critical ecosystems, providing drinking water for billions of people and habitats for wildlife. However, pollution has severely damaged these ecosystems and threatened access to clean water. While it is challenging to identify the single most polluted river, several contenders stand out. The Citarum River in Indonesia is widely regarded as one of the most polluted due to industrial waste, sewage, and toxic chemicals. The Ganges in India, sacred to Hindus, is also heavily polluted by sewage and chemicals. Other contenders include the Mississippi in the US, the Jordan River in Israel, and the Sarno in Europe.
| Characteristics | Values |
|---|---|
| Name of River | Citarum River |
| Country | Indonesia |
| Population it serves | 28 million |
| Length | 300 km |
| Causes of Pollution | Industrial waste, household sewage, runoff from farms, textile factories' poor wastewater treatment, untreated sewage |
| Impact | Children suffer from itchy and burning skin, rice yields fall, economic losses of over $866 million over two decades |
| Other Highly Polluted Rivers | Ganges River, Mississippi River, Jordan River, Ravi River, La Paz River |
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What You'll Learn
Pharmaceuticals and personal care products (PPCPs)
The pollution of rivers is a pressing issue, with industrial, urban, and agricultural waste causing substantial harm to river ecosystems and threatening access to clean drinking water. Pharmaceuticals and personal care products (PPCPs) are a significant contributor to this crisis, posing risks to both environmental and human health.
PPCPs encompass a diverse range of products used for personal health, cosmetic, and agricultural purposes. This includes prescription and non-prescription human drugs, illegal drugs, veterinary drugs, antibiotics, hormones, antidepressants, and lipid regulators, among others. These substances can have physiological effects on humans even at low doses, and their presence in freshwater ecosystems has raised concerns about potential adverse impacts on both humans and wildlife.
The environmental persistence of PPCPs is a critical factor. While some PPCPs can be easily broken down or processed by human or animal bodies, others are highly resistant to degradation. The chemical composition and metabolic pathway of each substance determine its persistence in the environment. This resistance to degradation allows PPCPs to accumulate in the bodies of aquatic organisms, with potential consequences for human consumption.
Studies have detected PPCPs in rivers and other water sources worldwide. For example, a study of a river in central Texas found higher concentrations of certain pharmaceuticals in invertebrates than in fish, indicating the selective accumulation of specific compounds. Another study in Switzerland detected various pharmaceuticals and hormones in wastewater treatment plant influent and effluent, as well as in raw drinking water samples. Additionally, rivers in the Iberian Peninsula were found to contain pharmaceuticals and personal care products, with higher concentrations of pharmaceuticals and hormones.
The contamination of rivers by PPCPs is a global issue. A 2022 study investigated 1,052 sampling sites along 258 rivers in 104 countries and found that pharmaceutical pollution threatened environmental and human health in over a quarter of the studied locations. The most contaminated sites were associated with low- to middle-income countries lacking adequate wastewater and waste management infrastructure and pharmaceutical manufacturing regulations.
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Industrial waste
One of the most polluted rivers in the world, the Citarum River in Indonesia, is a stark example of the impact of industrial waste. The river, which serves as a source of drinking water and irrigation for millions, has been contaminated by industrial waste from over 2,000 factories. High levels of mercury and other toxic chemicals have been detected in the water, far exceeding safe standards. Similarly, India's Ganges River, considered sacred by Hindus, is plagued by industrial effluents, untreated sewage, and chemical pollution, posing serious health and ecological risks.
In the United States, the Mississippi River struggles with pollution from unchecked industrial waste, sewage, and agricultural runoff. This has resulted in a significant decline in marine life and the creation of a "Dead Zone" spanning over 8,000 square miles. The Passaic River in New Jersey has also been affected by industrial contaminants, including mercury and PCBs, compromising its water quality.
South America's most polluted river, a 40-mile stream in Argentina, is tainted by industrial waste from factories, particularly tanneries. Heavy metals, foul odours, and slaughterhouse waste characterise this river, posing risks to the environment and those reliant on its water. Meanwhile, in Europe, the Sarno River is possibly the most polluted on the continent, suffering from unchecked dumping of industrial waste, leading to soil degradation during frequent flooding.
The global impact of industrial waste on rivers is evident, with pollution affecting not only the environment but also the health and livelihoods of millions who depend on these waterways for survival.
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Sewage
One of the most polluted rivers in the world, the Citarum River in Indonesia, has high levels of mercury due to industrial waste from factories. Similarly, the Ganges River in India, the third-largest river in the world, is sacred to Hindus but is polluted by raw sewage and chemicals. This has led to higher waterborne diseases in communities relying on it. The Yamuna River, India's second-most polluted river, also faces severe pollution from sewage and agricultural and industrial waste, resulting in toxic foam and high pH levels that may be irreversible through water treatment.
In South America, a river in Argentina, known as the Slaughterhouse River, is considered the most polluted due to industrial waste and sewage. This river contains heavy metals, giving it a foul smell and causing health issues such as cancer. The Nile River in Egypt, a crucial source of water in a populous and agricultural country, is polluted by industrial wastewater, oil pollution, sewage, and agricultural drainage, impacting the species in its waters.
The Mississippi River in the United States, a source of drinking water for millions, is affected by industrial waste, sewage, and agricultural runoff, creating a "Dead Zone" over 8,000 square miles. The Passaic River in New Jersey has also suffered from industrial contaminants, including mercury and PCBs. Rivers like the Jordan River in Israel and the Sarno in Europe have faced pollution from unchecked waste disposal, leading to increased salinity and soil degradation, respectively.
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Oil spills
The predictability of river currents helps in forecasting the movement of oil spills. Wind patterns, river geometry, and the presence of dams or locks influence the trajectory of oil on water. Wind blowing along the length of a river can carry oil spills far downstream before reaching the shoreline. Dams and locks can slow down or divert water flow, impacting the movement of spilled oil. These factors must be considered when responding to oil spills in rivers to effectively contain and mitigate their impact.
To address oil spills in rivers, response teams employ various techniques. Skimming, as seen in the case of the Delaware River spill in 2004, is one method used to contain and remove oil from the water's surface. When oil sinks, vacuum devices can be used, although they may capture water and sand along with the oil, reducing their effectiveness. The cleanup process must consider the specific characteristics of the river and the type of oil spilled to minimize environmental damage and avoid causing further harm during remediation.
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Agricultural waste
The Nairobi River in Kenya is another example of a river heavily impacted by agricultural waste. Agriculture, slums, and industrial activities all contribute to the river's pollution. During the rainy season, the river's low-lying banks overflow, carrying waste and pollutants from farms, human settlements, and industrial sources downstream. This has resulted in brackish and foul waters in the lower stream, negatively affecting the river's ecosystem.
In Europe, the Sarno River is considered possibly the most polluted river on the continent. Despite having a clean and drinkable source, the river has been contaminated by unchecked dumping of agricultural, human, and industrial waste. Frequent flooding causes toxic water to spill onto the land, leading to soil degradation.
The Ruzizi River, which runs along the border between Rwanda and the Democratic Republic of Congo, is also impacted by agricultural activities. The river provides hydroelectricity for the two countries and Burundi, but dams and irrigation practices have altered its flow and contributed to pollution.
Agricultural runoff and wastewater from livestock farming are significant contributors to pharmaceutical pollution in rivers. This type of pollution is a global issue, affecting waterways even in countries with water treatment infrastructure. The presence of pharmaceuticals in rivers can have detrimental effects on aquatic life, such as interfering with hormone function in fish, and can also pose risks to human health.
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Frequently asked questions
The Citarum River in Indonesia is widely considered the most polluted river in the world. It is contaminated by industrial waste, household sewage, and runoff from farms.
The river is critical to both agriculture and industry in Indonesia, irrigating 400,000 hectares of agricultural land and supporting 2,000 industrial facilities. The pollution has impacted the quality of agriculture and public health in the basin, leading to economic losses of over $866 million over two decades.
Yes, several other rivers are considered highly polluted. These include the Ganges River in India, the Mississippi River in the United States, the Jordan River in Israel, the Sarno River in Europe, and the Ravi River in Pakistan.
River pollution is caused by a variety of factors, including industrial waste, agricultural runoff, sewage discharge, oil pollution, and chemical contaminants. Pharmaceutical pollution is also a growing concern, with antibiotics, anti-inflammatories, and antidepressants found in rivers worldwide.
River pollution has severe consequences for both human health and the environment. It can lead to increased incidences of waterborne diseases, skin irritation, and pose risks to aquatic life and ecosystems. Polluted rivers flowing into the ocean can create far-reaching impacts, threatening marine life and the health of ecosystems worldwide.
