Greta Jimenez
Onondaga Lake, located in Central New York, has historically been one of the most polluted lakes in the world. The lake's pollution stems from industrial waste and sewage, with high levels of mercury, ammonia, phosphorus, and other toxins contaminating the water and affecting the ecosystem. Despite recent efforts to clean up the lake, it still faces challenges, and some question the adequacy of the remediation measures. So, is Onondaga Lake still the most polluted lake? The answer is complex, as while significant improvements have been made, concerns remain about the long-term impact of pollution on the lake's ecosystem and the safety of human recreation.
| Characteristics | Values |
|---|---|
| Location | Central New York, northwest of Syracuse |
| Length | 4.5-4.6 miles |
| Width | 1 mile |
| Surface Area | 4.6-5 square miles |
| Maximum Depth | 62-65 feet |
| Average Depth | 35-36 feet |
| History of Pollution | Used as a dumping ground for human waste, industrial waste, and wastewater |
| Pollutants | Mercury, ammonia, phosphorus, chloride, sodium, calcium, sewage, bacteria, algae |
| Environmental Impact | Low oxygen levels, fish and plant death, foul-smelling gases, contaminated fish, harmful to humans |
| Cleanup Efforts | Dredging and capping of sediments, injection of nitrates, upgrades to sewage facilities and stormwater system |
| Current Status | Improved water quality, increased fish populations, declared "safe" by experts, swimming beach planned |
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What You'll Learn
Mercury contamination
Onondaga Lake, located in Central New York, has been called "the most polluted lake in the United States" by Robert Searing of the Onondaga Historical Association. The lake has a long history of pollution, starting in the late 1800s when the Solvay Process Company, a chemical manufacturer, began dumping its waste directly into the lake. This pollution continued even after the company was threatened with legal action by the New York State Attorney General in 1907.
One of the major issues with Onondaga Lake has been mercury contamination. Between 1946 and 1970, the Allied Chemical and Dye Corporation (which the Solvay Process Company merged into) discharged 165,000 pounds (75,000 kg) of mercury into the lake. This contamination was found throughout the lake, with the highest concentrations in the sediments of the Ninemile Creek delta and the southwestern portion.
The mercury contamination had severe ecological and health impacts. It bioaccumulated in the food chain, resulting in highly contaminated fish. This led to a fishing ban being imposed in 1970. The mercury also posed a risk to human health, with the potential for mercury poisoning if ingested.
Efforts have been made to remediate the lake and reduce mercury levels. In 2005, a decision was made to dredge and cap the sediments, removing 2.2 out of 20 million cubic yards of toxins. Additionally, a layer of calcium nitrate was applied to seal remaining contaminants. These measures were reported to be successful in reducing mercury levels and allowing for safe swimming in the lake. However, some critics argue that these efforts are insufficient, leaving 90% of toxic chemicals in the lake sediment.
Despite the improvements, Onondaga Lake still faces pollution issues. Industrial waste and wastewater continue to be concerns, with sewage flowing into the lake during heavy rains. While the lake is now considered safe for fishing and swimming in certain areas, it still carries the reputation of being highly polluted, and the cleanup process has been long and challenging.
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Industrial waste
Onondaga Lake, located in Central New York, has been considered one of the most polluted lakes in the world. The lake's pollution stems from a combination of industrial waste and sewage waste, with the former being the focus of this discussion.
Sources of Industrial Waste
Solvay Process Company and Allied Chemical and Dye Corporation
The lake's pollution can be traced back to the late 1800s when the Solvay Process Company, a chemical manufacturer, began dumping its waste material directly into the lake. This waste primarily consisted of salty wastes like chloride, sodium, and calcium, which were by-products of soda ash production. In 1907, the company faced legal threats from the New York State Attorney General over their waste disposal practices. Despite this, the dumping continued until the company merged with other chemical companies to form the Allied Chemical and Dye Corporation, which later became the Allied Chemical Corporation.
Honeywell's Predecessors and Syracuse Works
Honeywell's predecessors, including the Allied Chemical Corporation, are responsible for discharging approximately 165,000 pounds (75,000 kg) of toxic mercury into the lake between 1946 and 1970. Honeywell itself, through its three successor companies collectively known as Syracuse Works, has also contributed to the lake's pollution by dumping industrial waste, especially mercury, for over a century.
Efforts to Address Industrial Waste
Dredging and Capping
In 2005, efforts were made to address the industrial waste in Onondaga Lake by dredging and capping the sediments. This process involved removing 2.2 million cubic yards of toxins and placing a layer over the remaining material to reduce toxin levels in aquatic life.
Underwater Injection of Nitrates
Scientists have also employed the underwater injection of nitrates, essentially fertilizer, to lock mercury in the sediments. This method has been successful in eliminating up to 97% of the mercury in the water.
Current Status of the Lake
While Onondaga Lake has been declared safe by numerous experts and agencies, some local environmental organizations and residents remain skeptical about its safety. The lake's water quality has improved significantly, and it now meets all water quality standards, with mercury levels in fish being lower than those measured in the Adirondacks.
However, high levels of mercury contamination persist, and certain restrictions on fishing and swimming remain in place. The lake's transformation is a testament to the efforts of those committed to its remediation, but it also serves as a reminder of the costly consequences of improper waste disposal.
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Sewage
Onondaga Lake, located in Central New York, has been considered one of the most polluted lakes in the world. It has faced significant pollution issues due to industrial waste and sewage, earning a reputation as a cesspool and a source of foul odours. Sewage has been a major contributor to the lake's pollution, with Syracuse dumping human waste into the lake with little to no treatment for years. This has led to high levels of ammonia and phosphates, causing excessive algae growth. The decomposition of this algae further reduces oxygen levels in the lake, creating anoxic conditions that are harmful to fish and plant life.
Combined sewer overflow (CSO) has also played a role in the lake's pollution. During heavy rain or melting snow, the sewers overflow and discharge a mixture of stormwater and sanitary sewage into tributaries that eventually reach Onondaga Lake. Upgrades to Syracuse's main sewage facility have helped curb the problem by reducing the levels of phosphorus and ammonia entering the lake. However, sewage still flows into the lake during heavy rains, and ongoing projects aim to address this issue by separating rainwater and sewage infrastructure.
Mercury contamination has been another critical concern. Between 1946 and 1970, approximately 165,000 pounds of mercury were discharged into the lake by the Allied Chemical and Dye Corporation. This contamination has been addressed through innovative methods, such as the underwater injection of nitrates, which helped lock mercury into the sediments, resulting in a significant reduction of mercury levels in the water.
Despite the lake's history of pollution, recent efforts have led to improvements. Onondaga Lake is now considered the cleanest it has been in 100 years, and restrictions on fishing and swimming have been lifted or relaxed in certain areas. However, some concerns about the lake's safety remain, and ongoing monitoring and remediation efforts are necessary to ensure the lake's continued recovery.
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Combined sewer overflow (CSO)
Onondaga Lake, located in Central New York, has been labelled as one of the most polluted lakes in the world. The lake has been a site for salt mining, a tourist attraction, and eventually, a dumping ground for industrial waste.
CSO has raised concerns about bacteria and water quality. In the 1960s, Syracuse had approximately ninety points where CSO could reach Onondaga Creek, Harbor Brook, or Ley Creek. The high levels of ammonia and phosphates due to sewage wastewater have led to excessive algae growth in the lake. When this algae dies, the decomposition process consumes large amounts of oxygen, leading to low-oxygen conditions that choke aquatic life, especially in the deeper areas of the lake.
To address the issue of CSO, Syracuse has implemented projects like "Save the Rain," which aims to separate rainwater and sewage infrastructure. The reconstruction of I-81 also includes plans to replace century-old sewer lines with new ones that effectively separate rainwater and sewage. These efforts, along with upgrades at Syracuse's main sewage facility, are helping to curb the impact of CSO on Onondaga Lake.
While Onondaga Lake still carries a reputation for pollution, significant improvements have been made. Through pollution control efforts, cleanup work, and the modernization of the county's Metro wastewater plant, the lake is now the cleanest it has been in over a century. The ongoing revitalization has restored the lake's ecological health, improved water clarity, and increased plant and animal diversity in and around the lake.
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Algal blooms
Onondaga Lake in Central New York has been labelled as one of the most polluted lakes in the United States. The lake has a long history of industrial pollution, with the Solvay Process Company dumping waste material directly into the lake as early as the 1880s. This pollution continued for decades, with the Allied Chemical and Dye Corporation discharging 165,000 pounds of mercury into the lake between 1946 and 1970.
The lake's pollution has had severe environmental and health impacts. The high levels of ammonia and phosphates due to sewage wastewater have led to excessive algae growth. While Onondaga Lake has largely escaped toxic algae blooms over the past 30 years, the excessive algae growth has depleted oxygen levels in the lake, choking out fish and plants and leading to anoxic (oxygen-free) conditions in parts of the lake.
The improvement in Onondaga Lake's water quality can be attributed to various factors. The modernisation of the county's Metro wastewater plant, which contributes 20% of the lake's inflow, has significantly improved water quality. Additionally, a homegrown technology involving the underwater injection of nitrates helped to lock mercury in the sediments, reducing mercury levels in the water by 97%.
Despite these improvements, Onondaga Lake is still affected by pollution. In 2024, harmful algal blooms were found in the lake, leading to the indefinite closure of a beach and swimming area. While the lake has been declared "safe" by experts for fishing and swimming in certain areas, it continues to deal with the legacy of industrial pollution.
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Frequently asked questions
Onondaga Lake is still considered one of the most polluted lakes in the world. However, it is now at its cleanest in 100 years.
Onondaga Lake served as a dumping ground for human waste, industrial waste, and wastewater. This waste came from sources including the Solvay Process Company, which dumped waste material directly into the lake, and Syracuse's sewage system, which released untreated sewage into tributaries that flowed into the lake.
The pollution turned the lake into a hazardous body of water, with high concentrations of bacteria and a strong odour. It also led to excessive algae growth, low oxygen levels, and high levels of toxins and mercury in the water and surrounding soil. This made the lake unsafe for swimming and fishing.
Efforts to clean up Onondaga Lake have included dredging and capping toxic lake sediments, upgrading the local wastewater treatment plant, and injecting nitrates underwater to lock mercury in the sediments. These measures have significantly improved water quality and increased fish populations.
While Onondaga Lake is much cleaner than it used to be, opinions vary on whether it is safe for swimming. Some sources say that swimming is safe, at least from a boat, while others advise against it due to concerns about residual pollution and mercury levels. Local environmental organizations and residents believe that more needs to be done to ensure the lake's safety.
