Helena Joyce
Lake Washington, located near Seattle, was heavily contaminated by untreated sewage and wastewater containing nitrogen fertilizers and phosphate detergents in the 1950s. The booming population around the lake resulted in an influx of sewage, with an estimated 20 million gallons per day entering the lake from surrounding communities. This led to a significant decline in water quality, with the growth of cyanobacteria causing cloudy, smelly water and a decrease in oxygen levels, impacting the fish population. The pollution problem sparked scientific research, public initiatives, and the formation of agencies like Metro to address the issue and restore the lake's ecosystem.
| Characteristics | Values |
|---|---|
| Time period | 1941-1954 |
| Location | Lake Washington, Seattle, Washington |
| Pollutants | Wastewater, raw sewage, nitrogen fertilizers, phosphate detergents |
| Consequences | Cloudy, dirty, smelly water, decline in water transparency, increase in cyanobacteria, decrease in oxygen levels, disappearance of some fish species |
| Solutions | Creation of Metro, construction of sewer lines and sewage treatment plants, implementation of pollution controls |
| Results | Improvement in water transparency, decrease in potassium and nitrogen levels, revival of the lake's ecosystem |
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What You'll Learn
The pollution problem
Lake Washington, a body of water near Seattle, Washington, suffered from severe pollution in the 1950s. The lake, which had previously been clear and pristine, experienced a rapid decline in water quality due to a combination of factors.
One major contributor to the pollution problem was the dumping of raw sewage into the lake by the city of Seattle and the surrounding communities. This had been ongoing for decades but intensified after World War II due to the booming population growth in the region. It is estimated that by 1950, more than 20 million gallons (76 million litres) of wastewater were being dumped into the lake daily, containing nitrogen fertilizers and phosphate detergents. This led to an increase in algae growth, particularly cyanobacteria that fed on the phosphorus in the sewage, causing the water to become cloudy and bad-smelling. The decomposition of dead algae also consumed large amounts of oxygen, leading to a decline in fish species.
In addition to sewage pollution, the construction of the Lake Washington Bridge in 1940 and the growth of suburbs in the region contributed to the pollution problem. Runoff from the expanding suburbs and the increased use of cars and other vehicles added to the pollution load in the lake.
The cleanup of Lake Washington is considered a success story in environmental restoration and a testament to the ability of humans to reverse the damage caused by pollution. It also highlighted the importance of regional collaboration and scientific research in addressing environmental issues.
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Scientific research and public action
Lake Washington, located near Seattle, was heavily contaminated by untreated sewage in the 1950s. The city of Seattle had dumped raw sewage into the lake for decades, and while this ended in the early 1940s, runoff from the booming growth of the Eastside suburbs after World War II exacerbated the pollution problem. By the 1950s, an estimated 20 million gallons per day of sewage effluent entered Lake Washington from Seattle and its surrounding communities.
Scientific research in the mid-1950s identified the problem. UW researchers observed a decline in water quality and tied it to the pollution generated by Seattle's growing suburbs. The discovery of the cyanobacteria Oscillatoria rubescens in the lake in 1955, and the implication that phosphorus from sewage effluent was acting as fertilizer for its production, led UW Zoology professor W.T. Edmondson and other scientists to predict that nuisance algal conditions and water quality deterioration would worsen. The effluent stimulated the growth of algae that deprived the lake of light and consumed oxygen from the water, leading to a decline in water transparency and the disappearance of some fish species.
The scientific research results led to public initiatives to clean up the lake. Researchers worked with the citizens of Seattle to reverse the effects of the pollution, and citizens proposed a state law that would allow local governments in Washington to form metropolitan federations to solve problems that crossed city, county, and district boundaries. In 1957, the state legislature passed this measure, and in 1958, a ballot measure was passed in Seattle to establish an agency known as Metro to address the lake's pollution. However, it was defeated in the suburbs. Six months later, the measure was redefined to include only the issue of sewage disposal, and it passed in all communities. Metro's approach was to construct a network of sewer lines and sewage treatment plants that directed sewage away from the lake and towards Puget Sound. The $140 million project was locally financed and successfully improved the lake's transparency and reduced levels of potassium and nitrogen. By 1975, the lake's pollution problems were solved, and it returned to a thriving and healthy ecosystem.
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Sewage disposal
The sewage caused a range of issues for the lake. One of the most noticeable was the growth of cyanobacteria, which turned the water cloudy and gave it a bad smell. This bacteria need phosphorus to grow, which was present in the sewage. The bacteria also consumed large amounts of oxygen, leading to a decline in fish species. The water transparency was also affected, reducing from 15 feet to just 2.5 feet.
In response to this crisis, the Washington Pollution Control Commission issued a bulletin in 1955. This led to the creation of Metro in 1958, an agency dedicated to solving the sewage disposal problem. Metro's approach was to construct a network of sewer lines and sewage treatment plants that directed sewage away from the lake and towards Puget Sound. Over 100 miles of sewer lines were laid between 1963 and 1968, and by 1975, the lake's pollution problems had been solved. The transparency of the water improved, and levels of potassium and nitrogen decreased by more than 60%.
The cleanup of Lake Washington is considered a success story in environmental restoration and a demonstration of how humans can reverse the damage they have caused to the environment. It also led to increased involvement of Native peoples in the management of the region's fisheries, as their treaty rights were upheld in the 1974 Boldt Decision.
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Water treatment
Lake Washington, located near Seattle, was heavily contaminated by untreated sewage and wastewater in the 1950s. The growing suburbs of Seattle dumped raw sewage and wastewater containing nitrogen fertilizers and phosphate detergents into the lake, leading to a decline in water quality. This resulted in the growth of blue-green algae and cyanobacteria, causing the water to become cloudy, dirty, and smelly.
To address the water pollution problem, UW researchers and scientists worked with the citizens of Seattle to find solutions. Their research and public initiatives led to the creation of a new governmental body, called Metro, specifically tasked with addressing the issue. Metro's approach involved constructing a network of sewer lines and sewage treatment plants to divert sewage away from the lake and towards Puget Sound.
The construction of sewage treatment plants aimed to remove organic materials and treat the sewage before discharge. This process involved eliminating the phosphorus load from the effluent, which had been acting as a fertilizer for the growth of cyanobacteria and algae. By removing phosphorus, a complex chain reaction of species responses was initiated, leading to the decline of cyanobacteria and the improvement of conditions for other species.
The implementation of these water treatment measures took place between 1963 and 1968, with over 100 miles of sewer trunk lines and interceptors laid to carry sewage to the treatment plants. By February 1968, the effluent entering Lake Washington was reduced to zero, and the lake began to show signs of recovery.
By 1971, the transparency of Lake Washington's water had improved significantly, surpassing the levels observed in 1950. The levels of potassium and nitrogen in the lake also decreased by more than 60%, and the water clarity returned to 15 feet. These improvements demonstrated the successful cleanup of Lake Washington through the implementation of effective water treatment solutions and the dedication of the local community.
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The environmental movement
The environmental degradation of Lake Washington became a pressing concern for the local community and scientists alike. UW researchers, including George Anderson, played a pivotal role in bringing attention to the issue by observing and studying the declining water quality. Anderson's discovery of blue-green algae in the lake, a common indicator of deterioration, sparked further investigation and collaboration between scientists and citizens. This collective effort marked the beginning of a movement to restore the lake's ecosystem and address the root causes of the pollution.
The formation of the Washington Pollution Control Commission in the 1950s was a crucial step in acknowledging and addressing the pollution crisis. Their efforts, along with those of concerned citizens and scientists, led to the creation of Metro in 1958. Metro's mandate was to establish a regional governmental body that would oversee the construction of a comprehensive sewer system and direct sewage away from the lake. This initiative was met with some resistance, with the initial ballot measure passing in Seattle but failing in the suburbs, reflecting the complex dynamics of implementing environmental solutions across multiple communities.
However, with persistence and adaptation, Metro's efforts ultimately succeeded. By the late 1960s, over 100 miles of sewer trunk lines and interceptors were laid, effectively reducing the amount of sewage entering the lake to zero. The transparency and water quality of Lake Washington showed remarkable improvements, and by 1975, the lake had returned to its former glory, with water clarity restored to 15 feet and a significant reduction in potassium and nitrogen levels.
The successful cleanup of Lake Washington stands as a testament to the power of environmental advocacy and scientific collaboration. It serves as a reminder that human actions can not only cause pollution but also drive effective solutions. The environmental movement surrounding Lake Washington empowered citizens to take ownership of their local ecosystems and inspired similar initiatives worldwide, showcasing the transformative impact of collective action in preserving and restoring the natural world.
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Frequently asked questions
Lake Washington, near Seattle, was heavily contaminated by untreated sewage from the city and surrounding communities. This resulted in a decline in water quality, with the lake becoming cloudy, dirty, and smelly due to the growth of cyanobacteria and algae.
The pollution was caused by a combination of factors, including the dumping of raw sewage, wastewater containing nitrogen fertilizers and phosphate detergents, and runoff from the growing suburbs after World War II. The population boom in the surrounding communities also put a strain on the lake, with an estimated 20 million gallons of sewage effluent entering the lake daily.
The problem was solved through the creation of a new governmental body called Metro, which constructed a network of sewer lines and sewage treatment plants to direct sewage away from the lake. This, along with other pollution control efforts, resulted in a significant improvement in water quality, and by 1975, the lake was back to normal.
