Meghan Hodges
The Seine River in Paris has been polluted for over a century, with human-made runoff and waste being dumped into the river. In 2024, the city spent $1.5 billion on a cleanup project in preparation for the Olympic Games, but the river continues to face pollution issues, particularly after heavy rainfall. The main sources of pollution are leaking and overflowing sewage systems, which cause high levels of bacteria, including E. coli, and low oxygen levels in the water. Despite the challenges, the cleanup efforts have shown some success, with the number of fish species increasing from 3 to 32, and the river being deemed safe for swimming on July 17, 2024, for the first time in a century.
| Characteristics | Values |
|---|---|
| Pollution sources | Human-made runoff, animal carcasses, human waste, sewage, wastewater, grime, garbage |
| Pollutants | Bacteria (e.g. E. coli), viruses, parasites, ammonia |
| Effects of pollution | Low oxygen levels, high ammonia levels, Loss of fish and animal species |
| Cleanup efforts | $1.5 billion project, giant underground water storage basin, reduced frequency of wastewater dumping, improved environmental quality |
| Water status | Deemed safe on July 17, 2024, but concerns remain |
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What You'll Learn
Human waste and wastewater
The Seine has been polluted with human waste and wastewater for over a century. Paris spent $1.5 billion cleaning the river, but tests have shown fluctuating levels of bacteria such as enterococci and E. coli, which are found in the intestinal tracts of humans. The presence of these bacteria indicates the existence of faecal waste in the water, which heightens the possible presence of disease-causing bacteria, viruses, and protozoa.
The main source of this pollution is Paris's combined sewer system, which means that both wastewater and stormwater flow through the same pipes. When there is an excess of rain, the pipes reach full capacity, and instead of the extra wastewater flowing into a treatment plant, the sewage flows into the Seine. This creates an infamous smell and toxic water.
In recent years, Paris has made significant progress in reducing the amount of untreated wastewater that ends up in the Seine. In 2022, the amount of untreated wastewater was 90% lower than 20 years ago, thanks to infrastructure upgrades. However, there is still work to be done, as 1.9 million cubic meters of untreated wastewater was dumped into the river in 2022.
To help alleviate this issue, Paris has built the ""Bassin d'Austerlitz" (Basin of Austerlitz), a huge underground reservoir that can hold the equivalent of 20 Olympic swimming pools of dirty water. The reservoir is used to store excess rainwater and prevent it from contaminating the Seine. However, its effectiveness has been questioned, as heavy rain can still flush pollutants into the water.
The pollution of the Seine is not just a threat to the environment but also to human health. With the river being included in the 2024 Paris Olympics for events such as marathon swimming and the triathlon, there are concerns about the potential health risks for athletes. Paris officials have been working to clean up the river, and swimming was banned in 2023 due to high levels of metal and faecal bacteria in the water.
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Garbage and animal carcasses
The Seine has been a dumping ground for garbage and animal carcasses for centuries. In the 18th century, the river was described as "blood-red from animal carcasses, brown from garbage and excrement, black from tanners' dyes and rot". In addition to animal carcasses, humans have also dumped large items such as television sets and motorcycles into the river in recent decades.
The river has also been polluted by sewage and wastewater. Leaking and overflowing sewage systems are the main source of pollution, and heavy rain can overwhelm the sewage system, sending untreated wastewater into the Seine. In 2023, 1.9 million cubic meters of untreated wastewater, including domestic and industrial sewage, entered the river. While this was 90% lower than 20 years ago, pollution is still a significant issue.
The city of Paris has made efforts to clean up the Seine in preparation for the 2024 Olympic Games, which included swimming events in the river. The French authorities spent €1.4 billion ($1.5 billion) on improving water quality, with the goal of reducing bacterial contamination by 75%. A giant underground water storage basin was also inaugurated to collect excess rainwater and stop wastewater from entering the Seine.
Despite these efforts, the river continues to face pollution issues. Olympic swimmers fell ill after a swimming event, and heavy rain can still overwhelm the system, sending waste into the river. The cleanup efforts are ongoing, and the river is tested daily for bacteria and pollution.
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Sewage systems
Paris has a combined sewer system, meaning that wastewater and stormwater flow through the same pipes. When there is an excess of rain, the pipes reach full capacity, and instead of the extra wastewater flowing into a treatment plant, the sewage flows into the Seine. This has created an infamous smell and toxic waters.
In the lead-up to the 2024 Olympic Games, France spent $1.5 billion on a cleanup operation, with the long-term goal of allowing Parisians to swim in the river once again. Paris officials inaugurated a giant underground water storage basin to collect excess rainwater and prevent wastewater from entering the Seine. The large container can hold the equivalent of 20 Olympic swimming pools of dirty water. However, torrential rain meant that it was not possible to prevent sewage from flowing into the river during the Games.
The biggest source of pollution in modern times has been the dumping of countless tons of wastewater—which includes domestic and industrial sewage—into the river. In 2022, 1.9 million cubic meters of untreated wastewater was dumped into the Seine. However, the city says that as a result of recent infrastructure upgrades, the amount of untreated wastewater that ended up in the Seine in 2022 was 90% lower than 20 years ago.
To tackle the issue of sewage pollution, Paris has embarked on a €1.4 billion cleanup project. This includes building a 50,000-metre-cubed rainwater storage basin upstream of the Austerlitz bridge. This underground reservoir is designed to hold water during storms, before releasing it back into the sewer system. They have also been working on fixing connections from Parisian homes to the sewer system, as some have been sending their waste straight to the Seine or its tributaries.
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Bacteria, viruses and parasites
The Seine River in Paris has been polluted with unsafe levels of bacteria, viruses, and parasites, which have been a concern in the lead-up to the 2024 Olympic Games. Paris has a combined sewer system, meaning that wastewater and stormwater flow through the same pipes. During heavy or prolonged periods of rain, the pipes can become overwhelmed, causing untreated wastewater to flow into the river instead of to a treatment plant. This can result in bacteria, viruses, and parasites contaminating the water.
Bacteria, viruses, and parasites can pose significant health risks to anyone who comes into contact with or consumes the contaminated water. Water quality tests in June 2024 revealed unsafe levels of E. coli bacteria, which is typically found in human and animal digestive tracts and waste. While most strains of E. coli are not harmful, high numbers can indicate the presence of dangerous bacteria. Swimming in water with unsafe levels of bacteria can lead to various health issues, including gastrointestinal illnesses such as diarrhoea, abdominal cramps, vomiting, and nausea. In more severe cases, it can cause infections in the urinary tract or intestines, and even life-threatening sepsis.
In addition to E. coli, enterococci bacteria have also been detected in the Seine River. Enterococci are another indicator of fecal contamination and can signal the presence of potentially disease-carrying germs. The presence of coliform bacteria, which includes both E. coli and enterococci, is often used as a measure of fecal contamination in water.
To address the pollution issue, the city of Paris has invested approximately €1.5 billion in new infrastructure to improve the water quality of the Seine. This includes the construction of a massive holding tank underneath the river to collect stormwater and prevent overflow during heavy rainfall. Additionally, they have upgraded pipes and built river docks with sewage pits connected to houses and businesses along the Seine. However, despite these efforts, the Seine continues to face challenges, with fluctuating levels of pollutants affecting the safety of the water for Olympic athletes and the public.
The weather plays a crucial role in the pollution levels of the Seine. Heavy rainfall can contribute to the overflow of sewage into the river, while sunny days and ultraviolet rays can help reduce bacteria levels. Paris's lack of green spaces contributes to the issue, as rainwater is not absorbed into the ground and instead flows into the sewer system, increasing pollution in the river. As a result, the city is hoping for warm and dry weather during the Olympics to help keep the river clean and safe for the planned swimming events.
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Low oxygen and high ammonia
The Seine River in Paris has been infamous for its poor water quality for over a century. The first ban on swimming in the river came into effect in 1923, and the river was deemed unsafe for swimming in the 2024 Paris Olympics due to health concerns.
One of the main causes of the Seine's pollution is sewage systems. Leaking and overflowing sewage contaminates the river with bacteria and grime. Torrential rain can also cause wastewater to enter the river, increasing pollution levels.
Low oxygen levels and high ammonia concentrations are closely linked. Ammonia is oxidized during nitrification, a process that consumes oxygen. When oxygen levels are low, nitrification is inhibited, leading to increased ammonia levels. This relationship between oxygen and ammonia is further influenced by factors such as temperature, pH, and ionic strength.
Ammonia, a waste product, is typically processed in the liver and eliminated through urine. However, when there is a disruption in this process, ammonia can build up in the blood and become toxic. High ammonia levels can have detrimental effects on the central nervous system, causing confusion, disorientation, excessive sleepiness, and even coma. In the context of the Seine River, high ammonia levels can pose risks to aquatic organisms and ecosystems.
To address the issue of sewage and improve water quality, Parisian officials have implemented measures such as constructing a giant underground water storage basin to collect excess rainwater and prevent wastewater from entering the Seine. These efforts aim to reduce bacterial contamination and make the river safe for recreational activities like swimming.
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Frequently asked questions
The Seine has been deemed unsafe for swimmers for over a century due to high levels of ammonia, low oxygen levels, and dangerous bacteria like E. coli. Paris's sewer system is designed to collect wastewater and rainwater, but during heavy rainfall, the system can become overwhelmed, resulting in untreated wastewater flowing directly into the river.
The main sources of pollution in the Seine are leaking and overflowing sewage systems. Paris's sewer system combines wastewater and stormwater pipes, so during heavy rainfall, the pipes can become overwhelmed, resulting in untreated wastewater flowing into the river.
Swimming in the Seine can pose several health risks due to the presence of bacteria, viruses, and parasites in the water. High levels of E. coli bacteria, for example, can indicate the presence of dangerous bacteria and potentially disease-carrying germs.
In preparation for the 2024 Olympic Games in Paris, the city has invested $1.5 billion in new infrastructure to clean up the Seine. This includes the construction of a giant underground water storage basin to collect excess rainwater and prevent it from entering the river. The cleanup efforts have already shown positive results, with water safety tests in 2023 indicating that the Seine was swimmable about seven days out of every 10.
