Bronte Wells
Swimming in the ocean is a popular recreational activity, but it can also expose you to pollution and harmful microorganisms. Sewage overflows, stormwater runoff, and industrial livestock production are significant sources of pathogen pollution, which can cause various illnesses, including gastrointestinal problems and respiratory issues. Oil spills, accidents, and boating waste also contribute to ocean pollution, posing risks to both the ecosystem and human health. It is important to be aware of water quality and take precautions to ensure safe swimming experiences.
| Characteristics | Values |
|---|---|
| Health Risks | Gastroenteritis, gastrointestinal illness, respiratory disease, ear and eye infection, skin rash, nausea, vomiting, stomachache, fever, serious infectious diseases, sore throat, cough, kidney or liver damage |
| Sources of Ocean Pollution | Sewage overflows, stormwater runoff, malfunctions in treatment plants, boating waste, septic system malfunctions, animal waste, fertilizer, pesticides, trash, factory farms, oil spills |
| Illness Prevention | Avoid swimming near stormwater drains, check local water quality guides, wait 72 hours after a rain event before swimming |
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What You'll Learn
Health risks of swimming in polluted ocean water
Swimming in polluted ocean water can expose you to harmful microorganisms and pathogens, which can lead to various health risks and illnesses. These pathogens are often present in polluted discharges that enter the ocean, such as polluted runoff and untreated sewage. Here are some of the health risks associated with swimming in polluted ocean water:
Gastrointestinal Issues: The most common illness associated with swimming in polluted ocean water is acute gastrointestinal illness (AGI), specifically gastroenteritis. This can include symptoms such as nausea, vomiting, stomachache, diarrhea, headache, or fever. Gastroenteritis is typically caused by bacterial exposure to sewage-contaminated water.
Respiratory Infections: Viruses present in the polluted ocean water can lead to respiratory infections. Inhaling water droplets or aerosols containing these viruses can result in respiratory illnesses.
Ear, Eye, Nose, and Throat Infections: Swimming in polluted ocean water can increase the risk of ear, eye, nose, and throat infections. These are often classified as non-enteric illnesses, meaning they are not directly related to the intestinal tract.
Dysentery and Other Bacterial Infections: Protozoan pathogens in the water can cause dysentery, cryptosporidiosis, and giardiasis. These infections can lead to gastrointestinal distress and dehydration.
Exposure to Toxins: Polluted ocean water may contain toxins such as cyanobacteria, which can form algal blooms. Exposure to these toxins can result in hay fever-like symptoms, skin rashes, sore throat, cough, nausea, vomiting, diarrhea, and even kidney or liver damage.
It is important to note that the vulnerable populations, including children, the elderly, and individuals with weakened immune systems, are at a higher risk of developing severe illnesses from swimming in polluted ocean water. It is always advisable to check local water quality reports and avoid swimming in areas known to have pollution issues.
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Sources of ocean pollution
Ocean pollution is a pressing environmental issue that poses a threat to the health of our planet, including humans and marine ecosystems. Eighty per cent of marine pollution comes from land-based sources, with nonpoint source pollution being one of the biggest contributors. Nonpoint source pollution occurs when runoff from various sources, such as septic tanks, vehicles, farms, livestock ranches, and timber harvest areas, carries pollutants into the ocean. This type of pollution can make water unsafe for humans and wildlife, leading to beach closures and health issues for swimmers.
Another significant source of ocean pollution is sewage infrastructure issues. Inadequate or poorly maintained sanitary sewers can overflow during heavy rain or when pipes are blocked, releasing raw sewage into nearby waterways. Combined sewers, which are still present in many municipalities, are designed to discharge untreated sewage directly into waterways during rain events. Private septic systems used by many Americans also contribute to sewage pollution in coastal areas. Sewage pollution can contain harmful pathogens, leading to illnesses such as gastroenteritis and other gastrointestinal issues.
Industrial livestock production or factory farming is another major source of ocean pollution. These operations generate large amounts of manure, which can contaminate nearby waterways, especially during heavy rain. The overapplication of manure on cropland can also lead to runoff, further polluting creeks, rivers, and streams. Beach closures and shellfish restrictions have been necessary in some areas due to the impact of factory farming on water quality.
Oil spills are another well-known cause of ocean pollution, with ships and offshore drilling operations being the main contributors. Oil spills have severe ecological consequences, harming marine life and birds, and are extremely challenging to clean up. Crude oil can persist in the ocean for years and has been linked to cancer and reproductive issues in affected animals.
Lastly, plastic pollution is a significant and persistent issue in our oceans. Each year, eight million metric tons of plastic enter the ocean, with single-use plastics and discarded fishing gear being a major concern. Marine animals often mistake plastic debris for food or become entangled in plastic waste, leading to injuries and death. Plastic pollution also accumulates in ocean gyres, forming vast areas of concentrated debris that pose a threat to marine life and navigation safety.
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How to identify if ocean water is safe to swim in
Swimming in the ocean is a great way to cool off on a hot day, but it's important to make sure that the water is safe to swim in first. Water contaminated with germs, bacteria, and pollutants can make you sick if swallowed or cause infections if it comes into contact with open wounds. Here are some ways to identify if ocean water is safe to swim in:
- Check local guidelines and reports: Before heading to the beach, check your local council, state department website, or local water quality guide to see if there are any health warnings, advisories, or beach closures due to water contamination. These sources will provide information on water quality, including bacteria levels, and let you know if it's safe to swim.
- Be cautious after heavy rain: Rain can carry pollutants from the surrounding environment, including animal waste, sewage, and stormwater runoff, into the ocean. Wait at least 24 to 72 hours after heavy rainfall before swimming in the ocean to reduce the risk of exposure to contaminated water.
- Look for signs of pollution: While clear water is generally a good sign, it doesn't guarantee safety. Look out for debris, discolouration, or oil spills on the water's surface, which could indicate the presence of harmful pollutants.
- Ask lifeguards: If there are lifeguards on duty, ask them about the latest water quality test results and whether it's safe to swim. They are trained to monitor the beach and will be able to provide up-to-date information.
- Test the water quality: If you want to be thorough, you can test the water quality yourself using a water testing kit. These kits can detect bacteria levels and help you determine if the water is safe for swimming according to guidelines set by organisations like the British Triathlon Federation.
Remember, it's always better to be safe than sorry. If you have any doubts about the water quality or if you notice any potential signs of pollution, it's best to avoid swimming in the ocean until you can be sure it's safe.
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Illnesses caused by swimming in polluted ocean water
Swimming in polluted ocean water can expose you to harmful microorganisms and pathogens, which can cause a range of illnesses. These pathogens can include bacteria, viruses, protozoa, and parasites. While swimming-related illnesses are usually not serious and often require little to no treatment, they can be unpleasant and, in rare cases, can lead to more severe health issues.
One of the most common illnesses associated with swimming in polluted ocean water is gastroenteritis, which can cause nausea, vomiting, stomachache, diarrhea, headache, or fever. Gastroenteritis is often linked to sewage-polluted water, as even swallowing a small amount can induce sickness. Sewage can enter oceans through sewage overflows, stormwater runoff, treatment plant malfunctions, boating waste, and septic system malfunctions.
Another potential source of illness is cyanobacteria, which can form algal blooms in highly polluted water, leading to discolored water. Exposure to cyanotoxins produced by these bacteria can result in hay fever-like symptoms, skin rashes, sore throat, cough, nausea, vomiting, diarrhea, and even kidney or liver damage.
Swimming in polluted ocean water can also lead to respiratory infections, such as pneumonia or flu-like illnesses, as well as eye and ear infections. In rare cases, more severe diseases such as MRSA, hepatitis, encephalitis, meningitis, and Vibrio Vulnificus have been linked to exposure to polluted ocean water.
It is important to note that children, the elderly, pregnant women, and individuals with weakened immune systems are more vulnerable to developing illnesses or infections after exposure to polluted water. Therefore, taking precautions, such as checking water quality, avoiding swimming near stormwater drains, and avoiding swimming with open wounds, is crucial to minimize the risk of contracting illnesses.
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How to avoid swimming in polluted ocean water
Swimming in polluted ocean water can expose you to harmful microorganisms and pathogens, causing illnesses such as gastroenteritis, with symptoms like nausea, vomiting, diarrhoea, and fever. In highly polluted water, swimmers may even be exposed to more serious diseases like cholera and hepatitis. To avoid these risks, here are some guidelines on how to avoid swimming in polluted ocean water:
- Check local water quality reports: Before heading to the beach, check your local council or state department or county's environmental health website for water quality reports. Nonprofits like Surfrider also provide volunteer beach water quality monitoring data on the Blue Water Task Force webpage.
- Avoid swimming after heavy rain: Wait at least 72 hours after a rain event before entering the ocean. Heavy rainfall washes pollutants such as animal waste, fertilizer, pesticides, and trash into stormwater drains, which can then discharge them into the ocean.
- Stay away from stormwater drains: Avoid swimming near stormwater drains as they can actively release harmful microorganisms and pathogens into the water.
- Be aware of debris: Even if the water looks clear, there may be hidden debris like logs, trees, branches, or household rubbish floating under the surface after a rain event.
- Check for oil spills: Oil spills, although usually accidental, can occur in oceans due to boat, tanker, or pipeline accidents. These spills release liquid petroleum hydrocarbons, which are harmful to both the ecosystem and humans.
- Consider pollution sources: Pollution can enter the ocean through sewage overflows, malfunctioning septic systems, boating waste, and runoff from factory farms. Be cautious of swimming in areas near these potential pollution sources.
- Follow health warnings and closures: If a beach is closed or has a health warning, it is best to avoid swimming. These notifications are often posted due to high levels of harmful bacteria, viruses, or other pathogens in the water.
By following these guidelines, you can reduce your risk of swimming in polluted ocean water and protect your health and well-being. Remember, it is always better to be safe than sorry when it comes to your health.
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Frequently asked questions
Swimming in polluted ocean water can expose you to harmful microorganisms and pathogens, which can lead to various illnesses. These include gastrointestinal illnesses like gastroenteritis, respiratory infections, ear and eye infections, skin rashes, and in rare cases, more severe diseases like cholera, hepatitis, and even flesh-eating bacteria.
Ocean water pollution can be caused by various factors, including sewage overflows, stormwater runoff, malfunctions in treatment plants, boating waste, septic system malfunctions, and industrial livestock production. These sources can introduce bacteria, viruses, and protozoa into the water, making it unsafe for swimming.
It's important to check for water quality information before swimming in the ocean. You can do this by checking local council or state department websites, or volunteer beach water quality monitoring programs like Surfrider's Blue Water Task Force. It's recommended to avoid swimming near stormwater drains and after heavy rainfall, as pollution levels tend to be higher during these times.
If you experience any negative health symptoms after swimming in the ocean, it's important to seek medical attention and report your illness. Surfrider offers an Ocean Illness Reporting Tool that allows you to report illnesses related to ocean water exposure. By reporting your illness, you can help raise awareness and improve water quality monitoring efforts.
