Kiera Jefferson
Salt pollution is an emerging issue in freshwater ecosystems, caused by human activities such as the use of road de-icing salts, agricultural fertilizers, mining operations, and climate change. The practice of salting roads during winter storms, common since the 1940s, has led to increased salt levels in U.S. streams. While road salt is essential for safety, it can contaminate drinking water sources and harm aquatic life. Salt pollution also accelerates the corrosion of metal pipes and concrete infrastructure. To address this issue, individuals, communities, and organizations are encouraged to adopt practices that reduce salt usage and minimize its environmental impact, such as shovelling snow before applying salt and using only the recommended amount.
What is Salt Pollution?
| Characteristics | Values |
|---|---|
| Cause | Human activities such as the use of road de-icing salts, agriculture fertilizers, mining operations, and climate change |
| Impact | Increase in the salinity of freshwater ecosystems, harm to human health and infrastructure |
| Indicators | Chloride concentration, typically highest in winter months |
| Solutions | Shovel before applying salt, use a certified Smart Salting contractor, reduce salt use in communities |
| Affected Areas | Streams in the Willistown region, U.S. streams, freshwater near Ohio Wesleyan University |
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What You'll Learn
De-icing salt and road salt
Various kinds of salts are used as road salt, but calcium chloride and sodium chloride (rock salt) are the most common. The more expensive magnesium chloride is generally considered safer, but it is not as widely used because of its cost and effect on structural integrity. When used in its solid form, road salt is often pre-wet to accelerate the ice-melting process.
The widespread use of road salt has significant environmental and infrastructural repercussions. While effective and relatively inexpensive, this practice incurs hidden costs because of its corrosive nature, leading to approximately $5 billion in annual repairs across the United States, according to the country's Environmental Protection Agency. One of the primary environmental concerns is the contamination of water sources. For example, in the streams in the Willistown region, there have been acute spikes in salt concentration and evidence of chronic build-up. Chloride concentration, an indicator of salt pollution, is typically highest in winter, with a notable spike occurring in February 2021 due to snowmelt washing road salts into the streams.
Salt contamination in streams also harms human health and infrastructure. Road salt can end up in drinking water wells and water supplies and is often not removed by water treatment facilities. As salts move through the environment, they can pick up other pollutants, further contaminating streams and drinking water. Salts also speed up the corrosion of metal pipes and concrete, shortening the lifespan of infrastructure. Similarly, the overuse of salt can rust and corrode cars, leading to expensive repairs.
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Salt in drinking water
Salt pollution in drinking water is a pressing issue, particularly in regions with severe freshwater scarcity. Salt pollution in streams and other water bodies can have detrimental effects on human health and infrastructure. The primary sources of salt pollution are road salts used during winter storms, which eventually wash into waterways. This issue is exemplified in the Willistown region, where water quality monitoring has revealed acute spikes in salt concentration, primarily during winter months.
The presence of salt in drinking water has implications for human health, particularly for those on sodium-restricted diets. The Massachusetts Department of Environmental Protection (MassDEP) mandates that water suppliers notify relevant health authorities when sodium levels in drinking water exceed a certain threshold. This information is crucial for individuals monitoring their sodium intake due to high blood pressure or kidney-related issues.
While salt in drinking water can negatively impact those with specific health conditions, it is important to recognize that sodium is a mineral necessary for normal body function. Muscles and nerves depend on sodium to function, and it also plays a vital role in the body's hydration process. During exercise or sweating, the body loses electrolytes like sodium, and adding a small amount of salt to drinking water can help replenish these lost electrolytes, promoting better hydration.
However, it is crucial to approach salt consumption in drinking water with caution. Most individuals can obtain sufficient sodium through their diet, and maintaining a balanced diet with plain water should provide enough electrolytes for proper hydration. Additionally, excessive salt intake can lead to negative health consequences, such as high blood pressure and heart disease.
To address salt pollution in drinking water, it is essential to reduce salt use and prevent it from entering water sources. This can be achieved through practices such as shovelling snow before applying salt, using the recommended amount of salt, and considering alternative de-icing methods like sand. By implementing these measures, we can help keep our drinking water clean and protect both human health and the environment.
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Salt pollution in freshwater ecosystems
Salt pollution is a significant threat to freshwater ecosystems, with human activities being the primary cause. The increase in salt concentration, known as freshwater salinization, has severe impacts on the environment, human health, and infrastructure.
Freshwater ecosystems are essential for human societies as they provide drinking water, irrigation water, food, climate regulation, and recreational opportunities. However, human activities have led to a dramatic rise in salt levels in these freshwater systems. Sources of salt pollution include road salt application, water softening, mining, oil production, industrial processes, concrete weathering, sea-level rise, and fertilizer application. For instance, in the US, over 1.5 million tons of road salt is applied annually in Pennsylvania, which eventually ends up in waterways.
The leading cause of freshwater salinization in regions with heavy road salt use is road de-icing salt, which is released into the environment through storm sewers or by percolating through soils. This salt ends up in streams, rivers, lakes, wetlands, and groundwater, threatening the organisms that live there. Salt pollution can also be caused by point source pollution from water softeners and industrial effluent discharged directly into rivers.
The effects of salt pollution are far-reaching. Elevated salt concentrations directly impact species through osmoregulatory stress and community-level changes in the flow of energy and materials through food webs. It also increases the corrosion of metal pipes and concrete, shortening the lifespan of infrastructure. In addition, salts can pick up other pollutants as they move through the environment, further contaminating streams and drinking water sources.
To address salt pollution in freshwater ecosystems, a combination of strategies is necessary. These include reducing salt use, such as shovelling snow before applying salt, and proper salt application techniques. Additionally, managing industrial and agricultural sources of salt pollution, as well as implementing regulations and strategies to reduce salt inputs into water bodies, are crucial.
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Salt pollution in lakes, rivers, and streams
Salt pollution in freshwater sources, including lakes, rivers, and streams, is a growing environmental concern. While salt is naturally present in freshwater at trace levels due to rock and soil weathering, human activities have significantly increased salt concentrations. The primary human contributor to salt pollution in freshwater is the use of road salt for de-icing in winter, which has been common practice in the US since the 1940s.
The excessive application of road salt has led to dramatic spikes in the salt levels of nearby freshwater sources. For example, in the Willistown region, monthly water quality monitoring has revealed acute spikes and chronic build-up of salt contamination in local streams. This contamination is indicated by elevated chloride concentrations, which can exceed the thresholds that sensitive stream organisms can tolerate.
The influx of road salt into lakes, rivers, and streams has severe ecological consequences. High levels of chloride and other salt ions disrupt the osmotic regulation of cells in freshwater animals, from zooplankton to insects and fish, leading to mortality. This disruption of the food web, combined with the release of toxins and depletion of oxygen in waterways, creates an environment conducive to harmful algal blooms. Furthermore, increased salt concentrations can favour invasive species that thrive in brackish water, further altering the ecosystem.
Salt pollution also poses risks to human health and infrastructure. Elevated salt levels in drinking water can cause complications for individuals with kidney disease, high blood pressure, or other salt-sensitive conditions. Additionally, salts can corrode metal pipes and concrete, shortening the lifespan of infrastructure and potentially releasing toxic metals into the water supply.
To mitigate salt pollution in lakes, rivers, and streams, it is essential to reduce salt use and prevent salt runoff. This can be achieved through manual snow and ice removal, using alternative de-icers like sand, and implementing best practices to minimise salt application near freshwater sources. By raising awareness, collaborating with communities, and adopting more sustainable de-icing methods, we can help protect the health of our freshwater ecosystems and drinking water sources.
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Reducing salt pollution
Salt pollution, primarily caused by the use of road salt, is a significant environmental issue with adverse effects on water bodies, soil health, and infrastructure. To reduce salt pollution, individuals, communities, and local governments can adopt a range of strategies:
Shovel or Snow-Blow First
Before applying salt, it is essential to manually remove as much snow and ice as possible. This can be done through shovelling or using a snow-blower. By reducing the amount of ice that needs to be melted, less salt is required, making this method more effective and environmentally friendly.
Use Salt Sparingly
When using salt, it is crucial to follow the recommended amounts. For a 20-foot-long driveway, only one mug (12 oz) of salt is needed to melt the ice. Additionally, each grain of salt should be spread approximately 3 inches apart, covering 150 square feet per cup. Over-application of salt can lead to tracking and the deterioration of surfaces like concrete and asphalt.
Know the Right Temperature
Salt becomes ineffective at temperatures below 15 degrees Fahrenheit (F). At such low temperatures, consider using sand instead of salt for traction. While sand does not melt ice, it provides better traction for vehicles and pedestrians.
Sweep Up Extra Salt
If salt or sand is visible on dry pavement, it is no longer serving its purpose and will be washed away. Sweeping up this excess salt prevents runoff and allows for its reuse during the next snowfall.
Smart Salting Practices
Individuals responsible for maintaining sidewalks or parking lots can enrol in "Smart Salting" training programs. These programs educate participants on practices that reduce salt impacts on the environment while still ensuring road safety. Certified Smart Salting contractors can be hired to handle snow and ice removal, utilising environmentally conscious techniques.
Community Collaboration
By implementing these strategies, we can help keep our drinking water clean, protect aquatic ecosystems, and mitigate the negative impacts of salt pollution on our infrastructure.
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Frequently asked questions
Salt pollution is the increase in salinity of freshwater ecosystems due to human activities such as the use of road de-icing salts, agricultural fertilizers, mining operations, and climate change.
Sources of salt pollution include road de-icing salts, agricultural fertilizers, and mining operations. In the US, road salt is commonly used during winter storms to melt ice and snow, with over 1.5 million tons applied in Pennsylvania alone each year.
Salt pollution has negative impacts on aquatic organisms and ecosystems. It can harm fish, insects, mussels, amphibians, and zooplankton, leading to ecological imbalances such as an increase in phytoplankton biomass or microscopic freshwater algae. Salt pollution also affects drinking water quality and infrastructure, speeding up the corrosion of metal pipes and concrete.
To reduce salt pollution, individuals can shovel or snow-blow before applying salt, use the recommended amount of salt sparingly, and sweep up and reuse or dispose of extra salt or sand. Working with neighbors, businesses, and community organizations to find ways to reduce salt use is also effective.
Yes, alternatives to road salt include using sand or grit for traction when temperatures are below 15°F. Certified Smart Salting contractors can also be hired, as they are trained to use practices that reduce salt's environmental impact. Additionally, individuals can invest in winter tires and drive according to the conditions to improve safety.
