Meghan Hodges
Our rivers and oceans are being polluted by a wide variety of marine debris, including tiny microplastics, derelict fishing gear, abandoned vessels, and other solid waste. According to the World Economic Forum, 10 rivers are responsible for around 90% of river-borne plastic that ends up in the ocean, with Asia accounting for 8 of these rivers. The pollution of our water sources is a significant issue, with nearly half of our rivers and streams and over one-third of our lakes being contaminated and unfit for swimming, fishing, and drinking. This is caused by farm waste, fertilizer runoff, municipal and industrial waste, and other pollutants that are directly dumped into waterways.
| Characteristics | Values |
|---|---|
| Pollutants | Chemicals, waste, plastic, pesticides, fertilizers, dirt, silt, top soil, microplastics, derelict fishing gear, abandoned vessels, litter, oil spills, fertilizer, and more |
| Causes | Farm waste, fertilizer runoff, municipal and industrial waste, littering, poor waste management, storm water discharge, extreme natural events, oil spills, and more |
| Effects | Harm to fish and wildlife habitats, unsafe for humans, beaches closed, shellfish-growing waters affected, threat to human health, harm to marine species, interference with navigation safety, and more |
| Rivers with High Plastic Waste | Yangtze, Indus, Yellow, Hai He, Ganges, Pearl, Amur, Mekong, Nile, Niger |
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What You'll Learn
Plastic pollution
One of the major contributors to plastic pollution in rivers and oceans is the discharge of mismanaged plastic waste. This includes littering, poor waste management practices, and stormwater runoff. Rivers, in particular, play a crucial role in transporting plastic waste into the oceans. It is estimated that around 90% of river-borne plastic pollution in the oceans originates from just 10 rivers worldwide, with Asia accounting for eight of these rivers. These rivers include the Yangtze, Indus, Ganges, and Nile, among others.
The plastic waste in rivers and oceans comes from a variety of sources, including littering, such as plastic bottles, crates, and buoys, as well as derelict fishing gear and abandoned vessels. Over time, plastic debris can break down into smaller microplastics, smaller than 5 mm in size, which can be easily ingested by marine animals, leading to entanglement, ingestion, and habitat damage.
The accumulation of plastic pollution in our waterways has severe ecological consequences. It can harm or kill marine organisms, interfere with navigation safety, and even pose risks to human health. Additionally, plastic pollution can contribute to the growth of algae blooms, which deplete oxygen levels in the water, creating "dead zones" where aquatic life cannot survive.
To address plastic pollution in rivers and oceans, it is essential to implement effective waste management practices, improve recycling systems, and raise public awareness about the issue. Organizations like the NOAA Marine Debris Program provide educational resources to inform students, educators, and communities about the impact of plastic pollution and promote actions to prevent further contamination.
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Industrial waste
The toxic chemicals in industrial waste can also cause changes in the temperature of freshwater systems, making them dangerous for many water-dwelling organisms. For example, pollutants like total organic carbon (TOC) and compounds containing nitrogen and phosphorus can lead to eutrophication, which occurs when a body of water becomes enriched with nutrients and minerals. While this may sound beneficial, eutrophication promotes the overgrowth of toxic algae and plants, increasing carbon dioxide levels in the water. The rapid growth of these surface-dwelling organisms decreases sunlight penetration and leads to hypoxia (oxygen depletion), creating conditions that are uninhabitable for aquatic life. As fish die off and biodiversity decreases, the excess plant matter decomposes, releasing carbon dioxide that eventually makes its way into the ocean, contributing to ocean acidification.
Agricultural sites, mines, and manufacturing plants are significant contributors to industrial waste pollution in water systems. Fertilizers, pesticides, and other chemicals used in agriculture can seep into groundwater, harming animals, plants, and humans. During rainfall events, these chemicals mix with rainwater, flowing into nearby rivers and streams that eventually filter into the ocean, causing further water pollution. Additionally, industrial activities such as burning coal and fossil fuels (oil, petroleum, natural gas) release pollutants into the air, contributing to air pollution that eventually settles into waterways and oceans.
To address the issue of industrial waste polluting our rivers and oceans, responsible companies and industries should regularly assess their environmental impact and implement proper waste management systems. Water monitoring is a crucial aspect of this process, as it helps identify and mitigate the sources of industrial pollution before they cause irreversible damage to aquatic ecosystems and drinking water sources. By prioritizing sustainable practices and proper waste treatment policies, industries can play a pivotal role in preserving the health of our rivers and oceans for future generations.
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Farm waste
Industrial agriculture is one of the leading causes of water pollution in the United States. Farm waste, in particular, has a significant impact on the quality of water in rivers and oceans.
Agricultural Runoff
Agricultural runoff is the leading cause of water quality issues in rivers and streams, the third-largest source for lakes, and the second-largest source for wetlands. When it rains or there is snowmelt, water runs off fields carrying excess nutrients, pesticides, and manure into nearby streams and rivers. This water then flows into larger bodies of water, including oceans, carrying these contaminants with it. This runoff can stimulate algal blooms in lakes and rivers, leading to hypoxic (low oxygen) conditions that are harmful to aquatic life.
Contaminants in Farm Waste
Waste Lagoons
Large-scale factory farms often store animal waste in huge, open-air lagoons, which are prone to leaks and spills. When these lagoons reach capacity, farmers may apply manure to surrounding areas rather than pay to have the waste transported off-site. This over-application of manure can contaminate water supplies and emit harmful gases into the atmosphere.
Soil Erosion
Soil erosion due to agricultural activities can also contribute to water pollution. When soil is disturbed, sediments, nutrients, pesticides, and herbicides can be washed into nearby waterways. This can lead to excessive sedimentation in aquatic ecosystems, smothering breeding areas and degrading coastal and marine ecosystems, including coral reefs.
Water-Intensive Farming
Some types of farming are very water-intensive, putting pressure on water resources and contributing to water scarcity. In regions facing drought, the expansion of water-intensive crops, such as fruit and nut orchards, has reduced water availability for residents and contaminated groundwater with arsenic and other metals.
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Air pollution
One example of direct air pollution is the release of carbon emissions into the atmosphere, which are then absorbed by the ocean. The ocean absorbs as much as a quarter of man-made carbon emissions, contributing to water pollution and ocean acidification.
Soil, silt, and topsoil from fields or construction sites can also become air pollutants, running off into waterways and oceans. This type of nonpoint source pollution can harm fish and wildlife habitats, making river and ocean water unsafe for humans and wildlife.
Agricultural activities can contribute to air pollution, which, in turn, affects water quality. Farming chemicals can cause algae to bloom, leading to the formation of ""dead zones" where dissolved oxygen levels drop, making it difficult for aquatic life to survive. These microscopic algae can take over freshwater habitats, and when they die and decay, they further reduce oxygen levels in the water.
Additionally, air pollution from littering, poor waste management practices, and industrial activities can result in the release of solid waste and marine debris, such as plastic and electronic waste. These pollutants can break down into microplastics, which are ingested by marine animals, leading to entanglement, ingestion, and habitat damage.
Indirectly, air pollution from storm water discharge and extreme natural events, such as tsunamis and hurricanes, can also contribute to water pollution. These events can carry pollutants, such as litter and derelict fishing gear, into our waterways and oceans, further exacerbating the problem.
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Fertilizers
One of the primary ways fertilizers contribute to water pollution is through runoff. During rain or irrigation events, excess fertilizers that have not been absorbed by lawns, plants, or crops can be washed into nearby waterways. This runoff carries fertilizers, along with sediments, across lawns, roads, and natural landscapes, eventually reaching ditches, streams, and, ultimately, larger water bodies like reservoirs, lakes, rivers, and oceans.
The presence of excess nutrients, particularly nitrogen and phosphorus, in these water bodies can lead to a process known as eutrophication. Eutrophication occurs when the overload of nutrients causes certain types of algae to grow uncontrollably, resulting in what is known as an algal "bloom." This rapid growth of algae can discolor the water and reduce its clarity. As the algae grow and eventually die, they deplete the water of oxygen, creating hypoxic ("dead zones") or even anoxic conditions where no aquatic life can survive. Some forms of blue-green algae can also produce toxins that are harmful to fish, wildlife, and even humans, further exacerbating the problem.
The impact of fertilizer pollution extends beyond the immediate water bodies and affects the surrounding ecosystems and communities. For example, the infamous "dead zone" in the Gulf of Mexico, covering an area of about 8,500 square miles, has been linked to nutrient-laden rivers draining into it from nearby farms. This has resulted in reproductive issues for fish, leading to low spawning rates and egg counts, creating massive challenges for the region's fishing industry and the local economy.
To mitigate the problem of fertilizer pollution, it is essential to adopt better nutrient management practices. This includes applying fertilizers in the right amounts, at the right time of year, and with the appropriate methods. Additionally, using water-insoluble fertilizers or organic fertilizers can help reduce the risk of runoff and its subsequent impact on water quality. Many cities have also implemented bans on the use of chemical fertilizers in close proximity to lakes and rivers to protect these water sources from pollution. By implementing these measures and collaborating across watershed efforts, we can reduce the impact of fertilizers on our rivers and oceans and work towards restoring and maintaining their ecological balance.
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Frequently asked questions
Rivers and oceans become polluted by a wide variety of marine debris, including microplastics, derelict fishing gear, abandoned vessels, and other pollutants.
Rivers are a major source of plastic waste in the oceans. It is estimated that 1000 rivers are responsible for nearly 80% of global annual riverine plastic emissions, with the remaining 20% distributed over 30,000 rivers.
Marine debris can harm or kill marine animals when ingested or if they become entangled. It can also interfere with navigation safety and pose a threat to human health.
Non-plastic pollution in rivers and oceans can come from farm waste, fertilizer runoff, municipal and industrial waste discharges, and dirt or silt from fields or construction sites.
Pollutants can cause algae to grow quickly, producing toxins that harm other life in the river. When the algae die and decay, they deplete the oxygen in the water, which can cause invertebrates and fish to suffocate.
