Meghan Hodges
Pollution from a sewer can have devastating impacts on the environment and human health. Sewage overflows and leaks can contaminate rivers, lakes, and oceans with harmful chemicals, waste, plastics, and pathogens. This pollution can lead to a decrease in biodiversity, with insects, fish, and other aquatic life suffering the consequences. In addition, human health is at risk, with the potential to contract illnesses such as cholera, giardia, and typhoid and antimicrobial-resistant bacteria. The effects of sewer pollution are far-reaching, spoiling natural habitats and favorite swim spots and threatening ocean recovery. With the cost of updating wastewater infrastructure being high, innovative solutions such as waste-free toilets and resource recovery are being explored. However, everyone can play a part in improving water quality by properly disposing of waste and advocating for stronger regulations to hold polluters accountable.
| Characteristics | Values |
|---|---|
| Appearance | Foul slurry |
| Odor | Sewage stench |
| Impact on wildlife | Threatens biodiversity, including insects, fish, and aquatic life |
| Health risks | Germs, viruses, antimicrobial-resistant bacteria, and diseases such as cholera, giardia, typhoid, Legionnaires' disease, salmonella, hepatitis, dysentery, and cryptosporidium |
| Pollutants | Human waste, household chemicals, plastics, nutrients, heavy metals, pharmaceuticals, microplastics, PFAS, and industrial chemicals |
| Causes | Poor waste management, aging infrastructure, stormwater runoff, sewage overflows, and leaks |
| Prevention | Improving wastewater infrastructure, natural solutions (e.g., trees, wetlands, green roofs), public notification programs, and better regulations |
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What You'll Learn
Sewage pollution in rivers, lakes, and oceans
Sewage pollution is a pressing issue that affects rivers, lakes, and oceans, with far-reaching consequences for both human health and the environment. This type of pollution occurs when untreated human waste and other contaminants are released into natural water bodies, posing significant risks.
Sewage overflows are a major contributor to this problem. When sewer systems become overwhelmed, often during heavy rainfall, untreated sewage can spill out and make its way into nearby rivers, lakes, or oceans. This overflow contains a range of harmful substances, including human waste, chemicals, plastics, and pathogens such as bacteria and viruses. The release of raw sewage into natural water bodies is a serious health hazard, as it can spread diseases such as salmonella, hepatitis, dysentery, and cryptosporidium.
Agricultural pollution is another significant source of sewage pollution in these water bodies. Runoff from farms carries fertilizers, pesticides, and animal waste into rivers, lakes, and oceans. Nutrient pollution, caused by excess nitrogen and phosphorus, is a particular concern as it can lead to harmful algal blooms. These blooms deplete oxygen levels in the water, causing the death of aquatic species and creating a further spread of toxins.
The impact of sewage pollution extends beyond the immediate ecological damage. It also affects water-based activities and the mental and physical well-being of individuals who rely on clean water for recreation and relaxation. Additionally, it poses risks to those who unknowingly come into contact with contaminated water, such as through flooded basements or sewage spills on streets and parks.
To address sewage pollution in rivers, lakes, and oceans, it is crucial to invest in upgrading wastewater infrastructure and improving the management of waste. This includes preventing stormwater from rushing into sewers by expanding natural areas, planting trees, restoring wetlands, and creating green roofs. Strong notification programs are also necessary to alert the public about the release of untreated sewage into the environment, empowering citizens to make informed decisions and driving further support for solutions to reduce sewage pollution.
While the task of reducing sewage pollution is daunting, it is not insurmountable. By combining efforts to improve infrastructure with effective waste management and public awareness, we can work towards ensuring that our rivers, lakes, and oceans are safe and healthy for both the environment and human enjoyment.
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Infectious diseases caused by sewage
Sewage pollution is a serious issue that affects natural ecosystems and human health. It occurs when sewer systems are overwhelmed and untreated human waste is released into nearby bodies of water, such as rivers and streams. This can happen during heavy rain events or due to outdated infrastructure and insufficient wastewater treatment processes. The impact of sewage pollution extends beyond the unpleasant odour and includes the spread of infectious diseases. Here are some of the infectious diseases caused by sewage:
Hepatitis A
Hepatitis A is a liver disease caused by the Hepatitis A virus. It is transmitted through contaminated water or close personal contact with infected individuals. Symptoms include jaundice, fatigue, abdominal pain, loss of appetite, nausea, diarrhoea, and fever. While hepatitis A is typically self-limiting, about 15% of those infected may experience prolonged or relapsing symptoms over a period of 6 to 9 months. Vaccination can prevent Hepatitis A, but those who work with untreated sewage are at an increased risk of infection if the disease is circulating in their community.
Gastroenteritis
Gastroenteritis, commonly known as the "stomach flu," is an infection caused by various viruses, including rotaviruses, adenoviruses, caliciviruses, astroviruses, and noroviruses. Sewage contains germs that can cause gastroenteritis, with symptoms such as nausea, vomiting, and diarrhoea. These symptoms can lead to dehydration and further health complications, especially in vulnerable individuals such as infants, young children, and the elderly.
Giardiasis
Giardiasis is a waterborne disease caused by the microscopic parasite Giardia intestinalis (also known as Giardia lamblia). This parasite is commonly found in contaminated water sources, including sewage. It has a protective outer shell that allows it to survive outside the body for extended periods. Giardiasis typically causes diarrhoea, loose or watery stools, stomach cramps, and an upset stomach. While some people may be asymptomatic, this disease can lead to dehydration and nutritional deficiencies, particularly in young children.
Escherichia coli (E. coli) Infection
Escherichia coli, often referred to as E. coli, is a bacterium transmitted through contaminated water or via the faecal-oral route. Most people infected with E. coli experience gastrointestinal symptoms such as watery or bloody diarrhoea, abdominal cramps, nausea, vomiting, and fever. In severe cases, E. coli infection can lead to the development of hemolytic uremic syndrome, resulting in kidney failure and, in some instances, death. Young children, the elderly, and immunocompromised individuals are at a higher risk of severe outcomes.
Leptospirosis
Leptospirosis is caused by bacteria of the genus Leptospira, which can be found in the urine of infected animals, particularly rodents, cattle, and pigs. It can enter the human body through cuts or broken skin, or through the eyes, mouth, or nose. Leptospirosis can cause an influenza-like illness with symptoms such as high fever, severe headache, chills, muscle aches, vomiting, jaundice, abdominal pain, diarrhoea, or a rash. Without treatment, it can lead to kidney damage, meningitis, liver failure, respiratory distress, and, in rare cases, death.
It is important to note that workers who handle human waste or sewage are at an increased risk of exposure to various pathogens and diseases. Proper safety measures and waste management practices are crucial to minimise these risks and protect both human health and the environment from the harmful effects of sewage pollution.
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Stormwater and sewer overflows
Combined sewer systems collect rainwater runoff, domestic sewage, and wastewater into a single pipe. While these systems were adequate most of the time, higher-intensity storms could overload the pipes. To prevent backups of raw sewage into homes and street flooding, CSOs were designed to allow excess flows to discharge into nearby streams. However, this also means that untreated sewage and stormwater are released into the environment, polluting water bodies and endangering aquatic life and human health.
The increase in extreme weather events due to climate change has exacerbated the frequency of CSOs. Older wastewater collection systems, primarily in urban areas, are particularly vulnerable as they were designed to collect and convey both sewage and stormwater in one pipe. Additionally, urban sprawl and the expansion of concrete and asphalt surfaces have increased the amount of stormwater entering sewers, contributing to overflows.
To address this issue, several strategies can be implemented. One approach is sewer separation, which involves constructing a separate system of pipes for stormwater, ensuring that pipes do not overflow during heavy rains. While this is a challenging and expensive undertaking, it effectively reduces the occurrence of CSOs. Other techniques, such as installing rain barrels and creating green roofs, can also help mitigate CSOs and their impacts.
It is important for wastewater companies to take responsibility and improve their river water quality action plans. Investigations and fines have been implemented to address non-compliance with licence conditions. Additionally, transparency in data reporting and effective communication of improvement plans are crucial to address the issue of stormwater and sewer overflows.
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Plastic and other pollutants in water
Plastic pollution is the harmful accumulation of synthetic plastic products in the environment. Synthetic plastics are largely non-biodegradable and tend to persist in natural environments. They have been found in many environmental niches, from Mount Everest to the bottom of the sea.
Most plastic pollution in the oceans comes from land. Major rivers act as conveyor belts, picking up more and more trash as they move downstream. Once at sea, much of the plastic trash remains in coastal waters. Marine plastic pollution can then be carried by ocean currents around the world.
Plastic pollution has been consumed by many land-based animals, including elephants, hyenas, zebras, tigers, and camels, in some cases causing death. It has also been confirmed to cause liver and cell damage and disrupt the reproductive systems of some species. Plastic waste in oceans poses a threat to marine life, including birds, whales, fish, and turtles, which often mistake indigestible plastic waste for food and die of starvation as their stomachs become filled.
Plastic microfibers have been found in municipal drinking water systems and drifting through the air. Microplastics have also been found in human blood, lungs, and feces. Scientists are urgently trying to determine the extent to which microplastics harm human health.
Sewage pollution refers to the release of untreated human sewage into natural bodies of water, such as rivers, streams, and lakes. This sewage can contain harmful substances such as human waste, household chemicals, and plastics. It can also contain infectious diseases such as salmonella, hepatitis, dysentery, and cryptosporidium. Sewage pollution can have deadly effects on nature, including insects, fish, and other wildlife. It can also negatively impact human health, with water users at risk of contracting harmful illnesses, including viruses and antimicrobial-resistant bacteria.
To prevent sewage overflows, it is essential to invest in natural areas, such as planting trees, restoring wetlands, and creating green roofs, which help prevent stormwater from rushing into sewers.
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Water quality testing and public health
Sewage pollution is a pressing issue that poses significant risks to public health and the environment. It arises from the discharge of untreated or partially treated sewage into natural water bodies, such as rivers, seas, and coasts. This pollution not only destroys ecosystems and kills wildlife but also endangers the health of individuals who come into contact with contaminated water.
Water quality testing is essential to safeguard public health and protect natural water sources from the detrimental effects of sewage pollution. Testing helps identify the presence of harmful contaminants, including bacteria, viruses, heavy metals, and chemicals, which can pose serious health risks to humans. For instance, sewage pollution can contain pathogenic bacteria, such as E. coli, which can lead to severe gastrointestinal illnesses. Additionally, viruses, such as hepatitis, can be transmitted through contaminated water, causing life-threatening infections.
In the United States, the Environmental Protection Agency (EPA) has established safe drinking water standards that public water systems must adhere to. These standards ensure that the water supplied to the public is safe for consumption and meets specific quality parameters. However, it's important to note that these EPA standards do not apply to privately owned wells. As a result, individuals relying on private wells for their water supply are responsible for conducting their own water quality tests and ensuring the safety of their drinking water.
Well water testing is crucial to verify the absence of harmful contaminants. The Centers for Disease Control and Prevention (CDC) recommends that well owners regularly test their water for total coliform bacteria, nitrates, total dissolved solids, and pH levels. Nitrates, in particular, can pose a significant health risk, especially to infants, as high levels in drinking water can lead to serious illnesses. Additionally, testing for fecal coliform bacteria, including E. coli, is essential, as these bacteria can indicate the presence of harmful pathogens.
To ensure accurate and reliable water quality testing, individuals can refer to resources provided by the EPA and local health departments. The EPA's Drinking Water Hotline offers guidance on testing well water and identifying potential contaminants. Local health departments can also provide specific recommendations and address concerns related to water quality in their respective areas. By proactively testing water quality and implementing necessary treatment measures, we can safeguard public health, protect our natural water sources, and mitigate the detrimental impacts of sewage pollution on the environment.
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Frequently asked questions
Pollution from a sewer can look like a foul slurry, with solids such as tissue paper, wipes, condoms, sanitary products, and human waste. It can also be harder to spot, with only a change in the water's colour or smell.
Pollution from sewers can cause a risk to human health, with untreated sewage teeming with salmonella, hepatitis, dysentery, cryptosporidium, and many other infectious diseases. It can also affect biodiversity, amenity value and has the potential to kill fish and other aquatic life.
Sewage pollution is caused by everything we flush down the toilet or wash down the drain, as well as stormwater that surges into sewers. This includes wipes, nappies, cotton buds, cooking fats, and litter.
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