
Onondaga Lake, located in Central New York, has a long history of pollution. The lake, which is relatively small at 4.6 square miles, has been polluted by industrial and municipal sewage, chemical waste, and other toxic chemicals for over a century. The pollution has led to high levels of toxins in the lake, including mercury, chlorinated benzenes, BTEX compounds, PCBs, and PAHs, which have contaminated the water, lake-bottom sediments, and surrounding soils. This has resulted in the lake being unsafe for fishing and swimming for many years. However, recent efforts to clean up the lake have shown promising results, with mercury levels decreasing and the lake being declared safe for fishing and swimming in certain areas.
| Characteristics | Values |
|---|---|
| Location | Central New York, immediately northwest of and adjacent to Syracuse, New York |
| Length | 4.5 miles or 4.6 miles |
| Width | 1 mile |
| Average Depth | 35-36 feet |
| Northern Basin Depth | 62 feet |
| Southern Basin Depth | 65 feet |
| Maximum Depth | 63 feet |
| Drainage Basin Surface Area | 642 square kilometers or 285 square miles |
| Water Sources | Ninemile Creek, Geddes Brook, Onondaga Creek, Treated Wastewater from the Metropolitan Syracuse Wastewater Treatment Plant |
| Pollution Sources | Industrial and Municipal Sewage, Exhaust Fumes, Dumping of Unnecessary Products, Solvay Wastebeds, Allied Chemical and Dye Corporation, Crucible Specialty Metals |
| Pollutants | Mercury, Arsenic, Lead, Chlorinated Benzenes, Hexachlorobenzene, Phenol, PAHs, PCBs, PCDD/PCDFs, Volatile Organic Compounds (VOCs), Paint Sludge, Paint Thinner, Polluted Sediment, Iron, Chromium, Copper, Sodium, Calcium |
| Environmental Status | Superfund Site, Clean Water Act of 1972, Multi-Stage Program completed in 2017, Ongoing Cleanup Efforts |
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What You'll Learn
- Onondaga Lake is one of the most polluted lakes in the world
- Pollution sources: sewage, industrial waste, chemical byproducts
- The Clean Water Act and Superfund: legal efforts to reduce pollution
- Cleanup initiatives: removing industrial pollution, reducing mercury levels
- The lake's cultural significance and importance to the local ecosystem

Onondaga Lake is one of the most polluted lakes in the world
Onondaga Lake, located in Central New York, has been considered one of the most polluted lakes globally due to its history of industrial and municipal waste dumping. The lake, which is approximately 4.5 to 4.6 miles long and 1 mile wide, has suffered from significant pollution, including toxic chemicals and sewage discharge.
The pollution of Onondaga Lake started as early as the late 1800s when the Solvay Process Company, a chemical manufacturer, began dumping its waste directly into the lake. This company later became known as Allied Chemical, which continued to contribute to the lake's contamination by allowing mercury into the lake, leading to a fishing ban in 1970. The US Attorney General sued to stop the dumping of mercury, but the damage had already been done.
The lake's proximity to Syracuse, about 20% of whose sewage ends up in the lake, also played a role in its pollution. As Syracuse's population grew in the 20th century, the lake became a dumping ground for sewage, exhaust fumes, and other waste. The industrial development of Syracuse greatly impacted the lake, with one source stating that the lake is "paying the cost" of the city's growth.
Various toxins, including mercury, chlorinated benzenes, BTEX compounds, PCBs, PAHs, and heavy metals, have been found in the lake's water, sediments, and surrounding soils. These pollutants have had detrimental effects on the lake's ecosystem, including fish and plant life, and have posed risks to humans as well. The pollution was so severe that a white, gooey foam would sometimes wash up on the shoreline, harden, and then explode.
Recognizing the severity of the issue, efforts have been made to clean up the lake and reduce pollution. The passage of the Clean Water Act in 1973 and the closing of the major industrial polluter in 1986 were initial steps. Later, a 15-year multi-stage program was implemented, and in 2017, the lake finally met the criteria required by the New York State Department of Environmental Conservation and the US Environmental Protection Agency (EPA). The EPA has also designated Onondaga Lake as a Superfund site, with ongoing investigations and cleanup activities.
While progress has been made, the lake's reputation for pollution has been long-standing, and it continues to face challenges. However, with the combined efforts of citizens, government authorities, and environmental organizations, there is hope for the long-term improvement and preservation of Onondaga Lake.
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Pollution sources: sewage, industrial waste, chemical byproducts
Onondaga Lake, located in Central New York, has been severely polluted by sewage, industrial waste, and chemical byproducts. The lake, which is approximately 4.5 miles long and 1 mile wide, has suffered from the negative impacts of human activity and industrialization, resulting in a decline in water quality and ecological damage.
Sewage pollution has been a significant issue for Onondaga Lake. Syracuse, the city adjacent to the lake, has historically dumped untreated or inadequately treated human waste into the lake. This has led to high levels of ammonia and phosphates, causing excessive algae growth. The decomposition of this algae by bacteria further contributes to low oxygen levels in the lake, creating anoxic conditions that are detrimental to aquatic life. Combined sewer overflow (CSO) also plays a role in sewage pollution, as it releases a combination of runoff and sanitary sewage into tributaries that eventually reach the lake.
Industrial waste has also severely impacted Onondaga Lake. The industrialization and urbanization of the region resulted in the discharge of domestic and industrial waste into the lake. Additionally, the production of soda ash by companies like Honeywell and the Solvay Process Company led to the dumping of waste material directly into the lake. This waste, consisting of chloride, sodium, and calcium, contributed to the formation of the Solvay wastebeds along the southwest perimeter of the lake. These wastebeds continue to leech toxins, including methyl mercury, into the lake, posing a threat to aquatic life and ecosystems.
Chemical byproducts have further contaminated Onondaga Lake. The surface water and sediments of the lake contain pollutants such as mercury, polychlorinated biphenyls (PCBs), pesticides, creosotes, heavy metals (including lead, cobalt, and mercury), polycyclic aromatic hydrocarbons (PAHs), chlorinated benzenes, and BTEX compounds. These chemicals were intentionally dumped or unintentionally seeped into the lake from upland toxic waste sites and the Solvay wastebeds. The presence of these toxins poses dangers to humans, plants, and animals in and around the lake, underscoring the urgent need for remediation.
Despite efforts to improve the condition of Onondaga Lake, such as the passage of the Clean Water Act in 1973 and the closing of major industrial polluters, the lake remained highly polluted for many years. It was only through initiatives like the 15-year multi-stage program completed in 2017 that the lake eventually met the criteria set by environmental protection agencies. These initiatives focused on long-term operations, maintenance, and monitoring to ensure the effectiveness of the remediation efforts and the preservation of this sacred site.
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The Clean Water Act and Superfund: legal efforts to reduce pollution
Onondaga Lake, located in Central New York, has a long history of pollution. From the late 1800s to 1986, the lake was used as a dumping ground for industrial waste, with companies like the Solvay Process Company and Allied Chemical discharging toxic chemicals like mercury into its waters. Despite the passage of the Clean Water Act in 1973 and the closing of the major polluter in 1986, Onondaga Lake remained severely polluted.
The Clean Water Act
The Clean Water Act (CWA) is the primary federal law in the United States that addresses water pollution. Its objective is to restore and maintain the chemical, physical, and biological integrity of the nation's waters. The CWA introduced the National Pollutant Discharge Elimination System (NPDES), a permit system that regulates point sources of pollution, including industrial, municipal, and agricultural facilities. The Act also provides funding for publicly owned treatment works to improve wastewater treatment and protect wetlands.
Superfund
Superfund, established by the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA), is a federal environmental remediation program administered by the Environmental Protection Agency (EPA). It addresses sites contaminated with hazardous substances, known as Superfund sites. The EPA and state agencies use the Hazard Ranking System (HRS) to evaluate the potential risks to public health and the environment from these sites. Sites with a score of 28.5 or higher are placed on the National Priorities List, making them eligible for long-term remedial action and cleanup under the Superfund program.
Legal Efforts to Reduce Pollution in Onondaga Lake
Onondaga Lake has benefited from legal efforts to reduce pollution, including the Clean Water Act and Superfund initiatives. The passage of the Clean Water Act in 1973 set regulations and standards for wastewater and surface water quality, holding polluters accountable and providing funding for treatment improvements. Additionally, a 15-year multi-stage program, completed in 2017, helped the lake reach the criteria required by the New York State Department of Environmental Conservation and the United States Environmental Protection Agency. This included implementing long-term operations, maintenance, and monitoring programs to ensure the effectiveness of the remediation efforts.
The Superfund program has also played a role in addressing the pollution in Onondaga Lake. While it is unclear if the lake is officially designated as a Superfund site, the principles and funding of the program have likely contributed to the cleanup efforts. The Superfund's focus on investigating and remediating hazardous waste sites aligns with the challenges faced in restoring Onondaga Lake, and its impact on minority and low-income communities is particularly relevant to the Onondaga Nation's ongoing land rights action.
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Cleanup initiatives: removing industrial pollution, reducing mercury levels
Onondaga Lake, located in Central New York, has been a site of pollution for over a century. The lake's pollution stems from industrial waste, wastewater, and polluted runoff, threatening the health of the ecosystem and surrounding communities. Cleanup initiatives have been implemented to address the contamination and restore the lake's ecological balance.
Removing Industrial Pollution
The lake's industrial pollution dates back to the 1880s when various industries discharged waste, including mercury, salt processing residue, ammonia, organic compounds, and PCBs. Honeywell International, through its predecessors, played a significant role in this pollution. As a result, Honeywell has taken on a pivotal role in remediation efforts. The company completed the dredging of the contaminated lake bottom in 2014 and continues to work on cleanup projects at upland sites and contaminated lake tributaries. The Onondaga Lake Visitors Center, designed and built by Honeywell, provides the public with access to information about the cleanup process.
Reducing Mercury Levels
Mercury contamination in Onondaga Lake has been a significant concern, with levels in fish surpassing federal and state standards. It is estimated that 165,000 lbs of mercury were discharged into the lake by Allied Chemical, Honeywell's predecessor. Methyl mercury, a highly poisonous form of mercury found in aquatic systems, poses a severe threat to the lake's ecosystem. The high levels of mercury have resulted in the contamination of approximately 7 million cubic yards of lake-bottom sediments. Scientists and researchers are working to address this issue by implementing projects to reduce mercury levels and mitigate its environmental impact.
The cleanup initiatives at Onondaga Lake aim to address the complex legacy of industrial pollution and restore the lake's ecological health. By removing industrial pollutants, reducing mercury levels, and mitigating the effects of wastewater and runoff pollution, these initiatives strive to protect the lake's ecosystem and the well-being of the surrounding communities. The collaboration between government entities, responsible companies, and local stakeholders is vital to the success of these ongoing cleanup efforts.
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The lake's cultural significance and importance to the local ecosystem
Onondaga Lake is located in Central New York, immediately northwest of and adjacent to Syracuse, New York. The lake is 4.6 miles long, 1 mile wide, and has an average depth of 36 feet, with two deep basins. The northern basin is 62 feet deep, while the southern basin is 65 feet deep.
The lake holds cultural significance as the birthplace of Haudenosaunee democracy. Centuries ago, the Peacemaker brought the Seneca, Cayuga, Onondaga, Oneida, and Mohawk Nations together on the shores of Onondaga Lake. These warring nations accepted the message of peace, laid down their arms, and formed the Haudenosaunee Confederacy, the first representative democracy in the West. The lake thus became a sacred place, to be cared for and respected.
The lake is also important to the local ecosystem. It is surrounded by the city of Syracuse and the towns of Geddes, Salina, Solvay, and Liverpool. The lake's two largest tributaries are Ninemile Creek and Onondaga Creek, which contribute significantly to the lake's water flow. The lake is a dimictic lake, meaning its water completely mixes from top to bottom twice a year. This unique characteristic influences the distribution of nutrients, oxygen levels, and the habitat available for aquatic organisms.
The lake's ecosystem has faced significant challenges due to pollution. Industrial activities, sewage discharge, and chemical waste have historically contaminated the lake, endangering plant and animal life. However, recent efforts to curb pollution and restore the lake's health have shown promising results. Initiatives such as modernizing the county's wastewater plant, implementing underwater injection of nitrates to lock in mercury, and various cleanup programs have contributed to improving water quality and reducing pollution levels.
Onondaga Lake's transformation from a cesspool to a community asset is a testament to the combined efforts of citizens, government authorities, and environmental movements. The lake's cleanup has tackled the challenging task of removing centuries of industrial pollution and overhauling sewage and toxic chemical disposal practices. The ongoing preservation and restoration of Onondaga Lake are crucial for maintaining the delicate balance of the local ecosystem and honoring the cultural significance of this sacred site.
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Frequently asked questions
Yes, Onondaga Lake has a history of pollution. It has been described as "the most polluted lake in the United States". However, recent clean-up efforts have reduced pollution levels, and the lake is now considered safe for fishing and swimming in certain areas.
The lake received industrial and municipal sewage discharges for over 100 years, with companies like Allied Chemical and Honeywell discharging waste and pollutants such as mercury and sodium directly into the lake. Syracuse's population growth in the 20th century also contributed to the pollution, with sewage, exhaust fumes, and dumping of unnecessary products affecting the lake.
Various initiatives and clean-up efforts have been undertaken to improve the water quality and reduce pollution. The New York State Department of Environmental Conservation and the EPA have identified 11 subsites around the lake for investigation and clean-up. The EPA has also provided funding for the clean-up of contaminated sediment and floodplain soil in Ley Creek, a tributary of the lake. Upgrades to Syracuse's main sewage facility have helped curb algae-promoting nutrients, and a homegrown technology has helped reduce mercury levels in the water.











































