
There has been a long-standing environmental feud between Wisconsin, Illinois, and Indiana, with the states taking legal action against each other over air and water pollution. Wisconsin has threatened to sue Illinois and Indiana for polluting Kenosha County, while Illinois previously filed suit against Milwaukee, Wisconsin, for polluting Lake Michigan with sewage. The lake, which provides drinking water, recreation, transport, energy, food, and homes to over 12 million people, is also at risk from invasive species, climate change, habitat destruction, and industrial runoff. Michigan is also home to some of the country's most polluting power plants, with the top ten plants emitting 38.9 million metric tons of greenhouse gases, equivalent to 8.4 million cars.
| Characteristics | Values |
|---|---|
| States involved in the dispute | Wisconsin, Illinois, Indiana, Michigan |
| Nature of the dispute | Air pollution, sewage pollution |
| Legal actions | Illinois filed suit against Milwaukee in 1972, Wisconsin threatened to file suit in 2021 |
| Ruling | Case dismissed by U.S. Supreme Court in 1985 |
| Role of EPA | Failed to develop plans for Illinois and Indiana, working with Wisconsin to reduce emissions |
| Impact of pollution | Increased ozone levels, acid rain, climate change, invasive species, habitat destruction |
| Affected areas | Lake Michigan, Kenosha County, Racine, Sheboygan |
| Solutions | Amending Clean Air Act, stronger climate policies, renewable energy |
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What You'll Learn

Indiana, Illinois, and Wisconsin polluting Lake Michigan
Lake Michigan is a source of drinking water, recreation, transport, energy, food, and homes to over 12 million people and millions of wildlife species. The lake is lined by the states of Michigan, Indiana, Illinois, and Wisconsin. Unfortunately, the lake is at risk from invasive species, climate change, pollution, and habitat destruction.
In the past, there has been a long-standing environmental feud between the states that date back to 1972 when Illinois filed a suit against Milwaukee, accusing them of polluting Lake Michigan with sewage. The case was dismissed in 1985 by the U.S. Supreme Court, after Milwaukee had spent $2 million in legal fees. In 2021, Wisconsin threatened to file a suit against Kenosha County for a similar reason, but Indiana's attorney general, Neil Hartigan, labeled the threat as "saber rattling".
In addition to sewage, the lake has seen increased environmental stressors such as contamination and loss of habitat, especially in the southern areas due to urbanization and development. In the 1970s, there was a ban on the use of phosphate detergents from many of the surrounding industries to reduce polluting run-off in the lake. However, according to a 2022 report, the Environmental Protection Agency (EPA) proposed to disapprove State Implementation Plan (SIP) submittals from Illinois, Indiana, Michigan, Minnesota, Ohio, and Wisconsin regarding interstate transport for the 2015 ozone national ambient air quality standards (NAAQS).
Furthermore, electricity production is Michigan's largest source of global warming pollution, with 3,400 fossil-fuel-fired power plants operating in the United States. Michigan is home to 3 of the top 100 most polluting power plants, with the top 10 power plants emitting 38.9 million metric tons of carbon dioxide equivalent, which is equivalent to 8.4 million cars on the road for a year. These emissions contribute to global warming and climate change, which impact Lake Michigan and the surrounding region.
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Air pollution control in the three states
Air pollution control is a critical aspect of maintaining the health and well-being of communities in Indiana, Illinois, and Wisconsin. These three states have implemented various measures to address air quality concerns and ensure the well-being of their residents.
Indiana, officially known as the Hoosier State, has established the Indiana Department of Environmental Management (IDEM). One of IDEM's primary responsibilities is to safeguard the state's air quality. They work closely with the Indiana Office of Air Quality (OAQ) to enforce the requirements set by the Clean Air Act (CAA). This act focuses on reducing six key pollutants: carbon monoxide, lead, nitrogen dioxide, ozone, particulate matter, and sulfur dioxide. By adhering to the CAA, Indiana strives to protect its residents and the environment from the detrimental effects of poor air quality.
Illinois, the Prairie State, has also shown dedication to improving air quality. The state has worked with the Environmental Protection Agency (EPA) to address hydrocarbon emissions, particularly in northeastern Illinois. While Illinois has faced legal battles with neighbouring states over pollution, it actively seeks solutions. The state's efforts to control air pollution are evident, and they continue to work towards improving air quality for their residents.
Wisconsin, the Badger State, has been at the centre of air pollution disputes with its neighbours. Despite this, Wisconsin has taken steps to mitigate air pollution within its borders. The state has focused on understanding and reducing hydrocarbon emissions, especially in southeastern Wisconsin. Wisconsin's commitment to addressing air quality issues is evident, and they work closely with the EPA to find solutions.
All three states are actively involved in implementing measures to improve air quality. While there have been legal disputes between the states, each state recognises the importance of clean air for its residents. By working with the EPA and adhering to acts like the CAA, Indiana, Illinois, and Wisconsin strive to create healthier environments for their communities. These efforts are essential to protect the well-being of those living in these states and to preserve the natural beauty of the Midwest.
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The impact of power plants in Michigan
Michigan is bordered by Indiana, Illinois, and Wisconsin, and all four states share the shores of Lake Michigan. The lake provides drinking water, recreation, transport, energy, food, and homes to over 12 million people and millions of wildlife species.
However, Lake Michigan is at risk from invasive species, climate change, pollution, habitat destruction, and runoff from surrounding industries. In the 1970s, there was a ban on the use of phosphate detergents from many of the surrounding industries to reduce polluting runoff in the lake. While water conditions have improved over the last two decades, there is still work to be done.
In addition to the risk to Lake Michigan, there is also an environmental legal battle brewing among Wisconsin, Illinois, and Indiana regarding air pollution. In 2022, the Environmental Protection Agency (EPA) proposed to disapprove State Implementation Plans (SIP) from Illinois, Indiana, Michigan, Minnesota, Ohio, and Wisconsin regarding interstate transport for the 2015 ozone national ambient air quality standards (NAAQS). The "'good neighbor'" provision requires that each state's SIP contain adequate provisions to prohibit emissions from within the state from significantly contributing to nonattainment or interfering with the maintenance of the NAAQS in other states.
Furthermore, Michigan is home to 3 of the top 100 most polluting power plants in the US. In 2020, Michigan's top 10 most climate-polluting plants were responsible for 85.7% of carbon dioxide equivalent emissions from the power sector, despite only generating 52% of the total electricity. All 10 facilities are powered by fossil fuels, with 5 primarily coal-fired plants and 5 primarily methane gas-fired plants. When fossil fuels are burned for electricity production, they release greenhouse gases, including carbon dioxide, methane, and nitrous oxide, which contribute to global warming.
To address power plant pollution in Michigan and beyond, strong regulations and climate policies are needed. The EPA should enact limits on carbon dioxide pollution from power plants, and Congress should pass a climate package that includes expanding clean energy tax credits. The Regional Greenhouse Gas Initiative has successfully reduced carbon dioxide pollution from power plants in the Northeast and Mid-Atlantic by capping emissions. By taking action at all levels of government and accelerating the transition to renewable energy, it is possible to get power plant pollution under control and protect the environment for future generations.
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The EPA's role in reducing emissions
Lake Michigan is a source of drinking water, recreation, transport, energy, food, and homes to over 12 million people and millions of wildlife species. It is lined by the states of Michigan, Indiana, Illinois, and Wisconsin. Unfortunately, like all of the Great Lakes, Michigan is at risk from pollution, invasive species, resource extraction, run-off from surrounding industries, and other environmental stressors.
In the past, there have been several instances of legal battles between these states regarding air and water pollution. In 1972, Illinois filed a suit against Milwaukee, accusing them of polluting Lake Michigan with sewage. The case was dismissed in 1985 by the U.S. Supreme Court. In 1984, seven Northeastern states filed a suit against seven Midwestern states, including Indiana, Illinois, and Michigan, to reduce air pollution that allegedly caused acid rain in Canada. This suit was also dismissed, as no direct link was found.
The Environmental Protection Agency (EPA) plays a crucial role in reducing emissions and addressing climate change. Here are some key aspects of the EPA's role:
- Climate Adaptation: The EPA works on climate adaptation, which means taking action to prepare for and adjust to the current and projected impacts of climate change. This includes protecting human health, communities, and ecosystems, making them more resilient and sustainable.
- Reducing Greenhouse Gas Emissions: The EPA develops and implements approaches to reduce greenhouse gas (GHG) emissions. This includes setting standards for vehicles, trucks, power plants, and other industrial sources. They also work with state and local governments on regulatory initiatives and voluntary programs to reduce emissions.
- Addressing Transportation Sector Emissions: The transportation sector is the largest source of direct GHG emissions. The EPA has implemented GHG standards for light-duty cars and trucks, as well as medium and heavy-duty trucks and buses, to reduce emissions from this sector.
- Collaboration and Education: The EPA collaborates with state, local, and tribal governments on initiatives, technical assistance, and voluntary programs related to climate change mitigation and adaptation. They also educate the public about climate change and actions to reduce GHG emissions.
- Clean Air Act: The EPA works within the framework of the Federal Clean Air Act to ensure that each state's air quality management program meets its responsibilities. This includes disapproving State Implementation Plans (SIPs) that do not adequately address interstate transport of air pollution and ozone national ambient air quality standards (NAAQS).
- Protecting Water Bodies: The EPA is involved in implementing and enforcing the Federal Clean Water Act to help restore and protect water quality in lakes and rivers. This includes reducing polluting run-off and improving water conditions for ecosystems and human communities.
- International Cooperation: The EPA works domestically and internationally to reduce emissions. They pursue regulatory actions and voluntary programs to achieve emission reduction goals.
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Legal battles between the three states
Lake Michigan is a source of drinking water, recreation, transport, energy, food, and homes to over 12 million people and millions of other wildlife species. The lake is shared by the states of Michigan, Indiana, Illinois, and Wisconsin.
In 1972, Illinois filed a suit against Milwaukee, Wisconsin, on charges of polluting Lake Michigan with sewage. The case was dismissed in 1985 by the U.S. Supreme Court, after Milwaukee had spent $2 million in legal fees.
In 1986, Wisconsin Gov. Anthony Earl directed the state's attorney general to file a suit against the federal government, Illinois, and Indiana over smog that allegedly blows into southeastern Wisconsin from the two neighboring states. The attorney general of Illinois, Neil Hartigan, labelled Wisconsin's threat to file suit "saber rattling", arguing that Wisconsin wanted someone else to pay for the cleanup of Kenosha County.
In 2022, the Environmental Protection Agency (EPA) proposed to disapprove State Implementation Plan (SIP) submittals from Illinois, Indiana, Michigan, Minnesota, Ohio, and Wisconsin regarding interstate transport for the 2015 ozone national ambient air quality standards (NAAQS). The EPA noted that each state's SIP must contain adequate provisions to prohibit emissions from within the state from significantly contributing to nonattainment or interfering with the maintenance of the NAAQS in other states.
Wisconsin has also been involved in legal battles with Illinois and Michigan over water diversion from Lake Michigan. In 1980, the Court modified the procedure for determining whether Illinois was diverting more than its allotted share of water from the lake. Additionally, Michigan has sued Illinois in an attempt to stop the diversion of water from the lake by Illinois.
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Frequently asked questions
Yes, Indiana, Illinois, and Wisconsin are contributing to pollution in Michigan. All three states border Lake Michigan and have been involved in legal battles over air and water pollution.
Both. Air pollution is caused by emissions, and ozone levels are a particular concern. Water pollution is caused by runoff from surrounding industries and loss of habitat.
The Environmental Protection Agency (EPA) is involved in monitoring and controlling hydrocarbon emissions in the region. The Clean Air Act is also in place to improve air quality, but some argue that it needs to be amended.
In the 1970s, a ban was placed on the use of phosphate detergents from surrounding industries to reduce polluting runoff. The federal Clean Water Act was also implemented to help restore water quality.
Pollution in Michigan comes from surrounding industries, invasive species, resource extraction, and power plants. Michigan is home to 3 of the top 100 most polluting power plants in the US.











































