Helena Joyce
Lake Norman in North Carolina is a popular destination for those who enjoy water-based activities. However, the lake has been subject to pollution from a variety of sources, including coal ash, radium, and sewage spills. In addition, the surrounding area has been affected by issues such as stormwater runoff and pollution discharges. The lake's water quality is monitored and managed by Duke Energy and the state of North Carolina, but pollution continues to be a concern for those who use the lake.
| Characteristics | Values |
|---|---|
| Contaminants | PCBs, Mercury, Radium, Thallium, Nitrogen, Ammonia, Fecal Coliform Bacteria, Coal Ash |
| Sources of Pollution | Duke Energy Marshall Steam coal-fired plant, Lake Norman Woods sewage treatment plant, Atmospheric emissions, Effluent discharge, Floods, Stormwater runoff |
| Environmental Impact | Decline in Carolina heelsplitter mussel population, Changes in bass species composition |
| Water Quality Management | Duke Energy, North Carolina, Lake Norman Marine Commission, North Carolina Wildlife Resources Commission, Catawba Riverkeeper |
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What You'll Learn
Coal ash and atmospheric emissions
Lake Norman, a popular destination for aquatic activities, has faced pollution issues, including coal ash contamination and atmospheric emissions from nearby coal-fired power plants. Coal ash, the residual material from burning coal, contains hazardous metals such as arsenic, lead, and mercury, which are known carcinogens. Duke University scientists detected coal ash at Lake Norman shoreline sites, including Trump National Golf Club, indicating that ash from the power plant was distributed by the wind.
The presence of coal ash in Lake Norman is attributed to multiple factors. Initially, coal ash was directly dumped into nearby lakes, resulting in significant contamination. Over time, with the implementation of the Clean Air Act, scrubbers were added to power plant smokestacks to capture fine particulates, reducing the amount of coal ash released into the air. However, the tiny particles of coal ash that escape capture contain high concentrations of toxic elements, exacerbating the contamination issue. Atmospheric emissions from coal-fired plants likely caused coal ash particles to settle in the land surrounding Lake Norman before the implementation of the Clean Air Act.
The impact of coal ash pollution on Lake Norman and the surrounding area is significant. The lake's sediments reveal a history of coal ash deposition, with different types of coal ash identified. The toxic chemicals in the coal ash can leach out and enter the aquatic food chain, posing risks to both wildlife and humans. High levels of radium, thallium, nitrogen, ammonia, and fecal coliform bacteria have been detected in the lake, impacting water quality and posing potential health risks.
In response to the coal ash pollution, Duke Energy, the operator of the coal-fired power plants in North Carolina, has agreed to a settlement with the Catawba Riverkeeper Foundation. As part of the settlement, Duke Energy will clean up and excavate the remaining six coal ash sites in the state, including two in the Catawba Basin: the Marshall site on Lake Norman and the Allen site on Lake Wylie. The cleanup effort, the largest environmental cleanup in US history, will address nearly 100 million tons of coal ash and contaminated soil.
While the presence of coal ash and its impact on Lake Norman is concerning, it is important to note that the detection of ash at the shoreline sites was in low concentrations, within human health guidelines. Additionally, Duke Energy has been improving its wastewater management practices, and partnerships with wildlife organizations aim to minimize the impact of human activities on the environment. However, ongoing monitoring and management of the lake's water quality are crucial to ensure the safety and well-being of both the ecosystem and the residents who enjoy its aquatic offerings.
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Effluent discharge and sewage spills
Mecklenburg County has also reported several sewage spills in Lake Norman, with five incidents recorded in one summer. One notable event involved a broken pipe that dumped nearly 900 gallons of sewage into a cove near Jetton Park. These spills have been attributed to failed sewer systems or private contractors hitting pipes. The city has a rapid response team dedicated to addressing these issues, working to stop, clean, and dilute the spills, and testing the water to ensure bacteria levels are safe before lifting swimming advisories.
Lake Norman has a history of pollution, with radium from Duke Energy's Marshall Steam coal-fired plant previously raising radioactivity levels to 2.5 times the drinking water standard. Thallium levels in the area also exceeded groundwater standards. While third-party testing later verified safe drinking water levels, concerns about pollution resurfaced with the waterfront community of Lake Norman Woods being fined for releasing high levels of bacteria and chemicals into the lake.
The Lake Norman Commission, consisting of Lincoln, Catawba, Iredell, and Mecklenburg counties, has implemented regulations to promote safety and protect the lake's water quality. Duke Energy, which manages the land surrounding the lake, has also been working to improve its wastewater distribution practices. However, according to a 2004 report by the Catawba Riverkeeper Foundation, 500,000 gallons of sewage were dumped into the lake, highlighting the ongoing challenges of effluent discharge and sewage spills in the area.
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Radium and thallium contamination
Lake Norman in North Carolina is a popular destination for those who enjoy water-based activities. However, the lake has been subject to pollution from a variety of sources, including radium and thallium contamination.
Duke Energy has released data showing higher-than-expected levels of radioactivity in the groundwater, and the EPA has mandated the company to drill test wells to monitor and address groundwater pollution at its coal power plants. Despite these alarming findings, Duke Energy and state officials have asserted that the contaminated groundwater is contained within plant property and does not pose a risk to nearby residents.
The presence of radium and thallium in Lake Norman's water supply has raised concerns about the potential health risks for those who rely on the lake for drinking water and recreational activities. However, subsequent testing by third-party laboratories has verified that the lake's water quality meets EPA standards, and advisories related to water safety are regularly posted to ensure public health.
In addition to radium and thallium contamination, Lake Norman has also faced pollution from sewage spills, coal ash, and other contaminants. Efforts are being made by government agencies, non-profits, and environmental organizations to address these issues and maintain the lake's water quality.
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Duke Energy's wastewater permit
Lake Norman in North Carolina has been the subject of pollution concerns for many years. Duke Energy, which owns or controls the lakebed and surrounding land, has been at the centre of these concerns. In the past, Lake Norman was affected by radium from Duke Energy's Marshall Steam coal-fired plant, which raised radioactivity levels to 2.5 times the drinking water standard. Thallium levels also exceeded groundwater standards.
Duke Energy has a permit to discharge wastewater into an upstream section of the lake, with the condition that the water extracted is of the same quality as that being dumped. However, in May 2004, the Catawba Riverkeeper Foundation reported that 500,000 gallons of sewage were dumped into the lake. This has led to increased scrutiny of Duke Energy's wastewater permit and the company's impact on Lake Norman.
In 2014, the N.C. Division of Water Resources directed Duke Energy to apply for a National Pollutant Discharge Elimination System (NPDES) wastewater permit to address issues at its 14 coal-fired electric plants. This permit would modify or renew the company's existing permit and include plans for maintenance and other activities. The permit application process involves submitting required forms and fees, and Duke Energy encourages applicants to submit their applications electronically via the Lake Access Permit System (LAPS).
The LAPS tool requires applicants to create a profile and submit all necessary documents in PDF, JPG, or JPEG format. After submitting an application, a Lake Services representative will inspect the property and review the shoreline classifications and Shoreline Management Plan to determine if the request can be approved. Lake permits are typically valid for one year, and Duke Energy inspects lake structures after the permit expires. The company also provides lake level and flow release information on its website, via a phone line, and through a mobile app.
Duke Energy's operations and impact on Lake Norman are regulated by various entities, including the Federal Energy Regulatory Commission (FERC) and the North Carolina Wildlife Resources Commission. The company is subject to the ordinances of the state of North Carolina and the county in which the land falls. Duke Energy also collaborates with wildlife organisations to minimise the impact of human activities on the environment.
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Bacteria and chemical pollution
Lake Norman in North Carolina is a popular destination for those who enjoy aquatic activities. However, the lake has faced issues with bacteria and chemical pollution.
One source of bacterial pollution has been sewage spills. Over the past three years, there have been more than a dozen sewage spills in and around Cornelius, which have contaminated the waters of Lake Norman. These spills have been caused by issues with equipment at the Lake Norman Woods sewage treatment plant, leading to high levels of nitrogen, ammonia, and fecal coliform (bacteria from waste) in the lake.
Another instance of bacterial pollution occurred when Duke Energy's Marshall Steam coal-fired plant affected the lake with radium, raising the radioactivity level to 2.5 times the drinking water standard. Thallium levels also exceeded groundwater standards. While third-party testing later verified safe levels, the incident caused concern among the public.
In addition to bacteria, Lake Norman has also faced chemical pollution. One notable example is the presence of coal ash, which has contaminated not only Lake Norman but also other swimming spots in North Carolina. Coal ash can enter the lake through various methods, including atmospheric emissions, effluent discharge, and coal ash impoundments overflowing during hurricanes and tropical storms. While some claim that there is no link between coal ash and cancer, others argue that runoff from development and roads contributes more to pollution.
The lake has also been affected by heavy metals, which can be a concern for swimmers. While clear water is typically an indication of clean water, certain contaminants like heavy metals do not affect water clarity. PCBs, for example, are dispersed throughout Lake Norman and can bioaccumulate and biomagnify in certain species, such as largemouth bass.
To address these issues, various organizations are working to regulate and manage the lake. The Lake Norman Marine Commission, the North Carolina Wildlife Resources Commission, and several non-governmental and environmental organizations are all involved in the lake's management. Duke Energy, which has a permit to dump wastewater upstream, is also responsible for monitoring water quality and has been making improvements to reduce the amount of wastewater entering the lake.
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Frequently asked questions
Lake Norman has been polluted by coal ash, radium, and sewage spills. Coal ash has contaminated the lake through atmospheric emissions, effluent discharge, and coal ash impoundments overflowing during hurricanes and tropical storms. Radium pollution raised the radioactivity level in the lake to 2.5 times the drinking water standard. Sewage spills have also been an issue, with over a dozen occurring in and around Cornelius in the last three years.
Pollution in Lake Norman has had various impacts on the environment and human health. High levels of nitrogen, ammonia, and fecal coliform bacteria have been found in the lake, affecting water quality and posing potential risks to swimmers and recreational users. The lake's fish populations have also been impacted, with some species declining or becoming hybridized due to artificial stocking practices.
Efforts are being made to improve water quality and reduce pollution in Lake Norman. The Lake Norman Commission has implemented rules to promote safety on the water, and certain islands have been designated as protected areas for wildlife. Duke Energy, which has a permit to dump wastewater into the lake, has been working to reduce the amount of wastewater discharged. The Catawba Riverkeeper Foundation and other environmental organizations are also actively monitoring water quality and advocating for clean water.
There are mixed reviews regarding the safety of swimming in Lake Norman. Some people have reported swimming in the lake for many years without any issues, while others have raised concerns about pollution levels. While no samples of lake water have shown elevated levels of coal ash-related contaminants, there are still potential risks associated with other pollutants and bacteria. It is recommended to exercise caution and avoid ingesting the water when swimming in Lake Norman.
