Bronte Wells
Lake Norman, the largest lake in North Carolina, has faced pollution concerns in recent years. Located in the southern and central Piedmont climate divisions, the lake's water quality has been a subject of debate among residents and visitors. While some claim that the lake is safe for swimming and recreation, others point out instances of pollution, including toxic algae, sewage spills, and the presence of harmful substances like PFAS, coal ash, and heavy metals. With a history of environmental concerns, Lake Norman's pollution levels are an ongoing topic of discussion and investigation.
| Characteristics | Values |
|---|---|
| Pollution | Sediment pollution, toxic algae, raw sewage, toxic weed, PCBs, mercury, lead, urine, coal ash, PFAS |
| Affected wildlife | Fish, dogs, Carolina heelsplitter (a freshwater mussel), birds |
| Pollution sources | Duke Energy, sewage lift station failure, runoff from development and roads |
| Pollution regulations | Lake Norman Commission, Blue Heron island protection, recycling program |
| Water quality | Variable; some report clean water, others report pollution |
| Air quality | PM2.5 concentration 1.1x WHO guideline |
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What You'll Learn
Toxic algae
Lake Norman, a lake in North Carolina, has been facing issues with toxic algae blooms. These blooms are visually characterised by bright green discoloured water with a foul odour, turning to a milky blue as they decay. The blooms are dominated by dolichospermum, which belongs to the algal group cyanobacteria and can produce microcystins, a type of algal toxin. While no microcystins were detected in tests, toxin production can be dynamic, and it is not possible to tell if toxins are being produced simply by looking at the bloom.
The toxic algae have infested about 10 acres of the lake, which covers 31,880 acres across four counties. The rapid spread of the algae has caused concern, with residents and community leaders worried about the impact on the community. The blue-green algae have doubled their presence since 2023, and scientists have noted that the rate of spread is concerning, with a 100% increase in the last two years.
The algae pose a serious health risk, with warnings from state health officials to avoid the water where spotted. Children and pets are particularly vulnerable, with health officials urging residents to keep them away from water that is bright green, blue, discoloured, or scummy. Children are at greater risk of serious illness if they ingest the algae due to their lower weight, and animals can die within hours of ingesting the toxin.
There have been reports of dogs dying after swimming in algae-infested waters, with three dogs dying in Wilmington, North Carolina, and one in Marietta, Georgia. Following these incidents, Lake Norman issued health alerts, advising residents and lake users to avoid swimming or having bodily contact with the water in affected areas.
Treatment plans are currently underway to address the blue-green algae in Lake Norman, with the next treatment scheduled for June 10, continuing monthly until September. County leaders are also working to secure funding for treatment, with a goal of raising $60,000 to start treating the water as soon as possible.
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Sewage spill
Lake Norman, North Carolina, is a popular destination for boating and swimming. However, in recent years, the lake has faced issues with pollution, including sewage spills and toxic algae blooms.
In January 2024, a raw sewage spill affected Lake Norman, prompting health alerts and advisories for residents and lake users. Approximately 200 to 600 gallons of untreated sewage spilled into the lake due to a failed sewage lift station or a broken low-pressure sewer-service line. The affected area, near Smith Harbour Drive in Denver and Chapel Creek Drive, was potentially contaminated with fecal coliform bacteria and fecal matter. As a result, no-swimming signs were posted, and residents were advised to avoid bodily contact with the water until it was deemed safe again.
This is not an isolated incident for Lake Norman. In August 2017, a similar sewage spill occurred, releasing about 200 gallons of raw sewage into the lake due to a broken wastewater pipe. A no-swimming advisory was issued, and the area was potentially contaminated with bacteria.
In addition to the sewage spills, Lake Norman has also faced issues with toxic algae blooms. The algae have infested about 10 acres of the lake, and its presence has proven to be dangerous. In 2023, the toxic algae were responsible for the deaths of four dogs that swam in the lake.
While most algae blooms are typically harmless, it is impossible to know which are dangerous simply by looking at them. Therefore, it is crucial for lake users and residents to heed the warnings and advisories issued by health officials and stay out of the water until it is safe.
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Fish contaminated with PCBs
Lake Norman in North Carolina has been the subject of several health alerts due to pollution. The lake is used for boating and swimming, but there are some areas where people are advised not to eat the fish due to contamination with PCBs. PCBs, or polychlorinated biphenyls, are oily synthetic chemicals that were once used in electrical equipment and as additives in paint, plastics, and other products. They are now banned, but they continue to be released into the environment through leaks and the improper disposal of equipment.
Fish become contaminated with PCBs by living near contaminated sediment or by consuming contaminated prey. PCBs accumulate in the fatty tissues of fish, particularly bottom-feeding and predatory fish, and can reach levels thousands of times higher than the concentration in the water. This means that consuming fish is a primary way that PCBs enter the human body. PCBs are easily absorbed and slowly eliminated by the body, meaning they can build up over time. High levels of PCBs have been linked to reproductive and immunological problems, and they are classified as probable human carcinogens by the USEPA and the International Agency for Research on Cancer.
To reduce exposure to PCBs, people can follow fish consumption advisories and properly prepare their meals. The IDPH recommends removing the skin and fat from fish filets and cooking methods such as barbecuing, broiling, or baking on an elevated rack to allow fat to drip away. Poaching is also recommended if the broth is discarded. The FDA has a testing program for fish sold in grocery stores, but it only samples some of the fish.
PCB contamination is not limited to Lake Norman. A study found that farm-raised salmon from Scotland and the Faroe Islands between Norway and Iceland were the most contaminated, while salmon from Chile and Washington State were the least contaminated. The salmon industry disputed the findings, but the study highlights the importance of knowing the source of salmon to reduce PCB exposure. Eating a variety of fish can also help to limit exposure to PCBs and other contaminants.
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Sediment pollution
Lake Norman, located in North Carolina, is the state's largest lake. It was created between 1959 and 1964 as part of the construction of the Cowans Ford Dam by Duke Energy. The lake is a popular spot for boating, swimming, and other aquatic activities.
However, Lake Norman has faced issues with pollution, including sediment pollution. Sediment pollution has contributed to the decline of the Carolina heelsplitter, a federally endangered freshwater mussel species native to the Piedmont area. Sediments in the lake can reveal the presence and types of pollutants, such as coal ash, and can indicate when and where higher toxin concentrations occurred.
Coal ash, a toxic byproduct of burning coal, has been found to contaminate Lake Norman and the surrounding area. This contamination can occur through atmospheric emissions, effluent discharge, and flooding caused by hurricanes and tropical storms. The density of residential neighbourhoods close to the shorelines of the lake has also been identified as a factor contributing to erosion and sediment pollution issues.
To address these concerns, various measures have been implemented. The creation of the Lake Norman Commission, consisting of representatives from Lincoln, Catawba, Iredell, and Mecklenburg counties, has led to the establishment of rules promoting safety on the water and the protection of certain islands as designated areas for the Blue Heron. Additionally, erosion control basins have been implemented at primary drainage points to mitigate future erosion and sediment control issues.
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Coal ash pollution
Lake Norman, North Carolina, has been the site of coal ash pollution, with the toxic byproduct of burning coal contaminating the surrounding area. Coal ash pollution has been detected in the soil near Trump National Golf Club, Charlotte, and 19 other sites along the Lake Norman shoreline. Duke University scientists found potentially toxic fly ash, a byproduct of burning coal that contains heavy metals, in low concentrations at these sites. However, the findings suggest that areas downwind of coal-fired plants should be regularly monitored to protect human health. Avner Vengosh, a professor at Duke University, stated that "low concentrations of toxic metals in soil do not equal no risk".
The coal ash pollution at Lake Norman has multiple sources. Firstly, there is the Duke Energy coal-fired Marshall Steam Station, from which wind has distributed the ash widely. Additionally, there are countless coal ash fills across North Carolina, with 26 sites identified in the Charlotte area alone. Some of these sites are in busy business districts, just four miles from Lake Norman.
One notable incident of coal ash exposure occurred near Lake Norman High School in Mooresville, where construction disrupted around 40,000 tons of coal ash that had been sitting underground since 2001. The ash was sold by Duke Energy to Race Park USA, with the company claiming that the sale followed appropriate state permits and agreements to ensure environmental protection. However, the recent disruption caused by construction has exposed the toxic ash, with some of it ending up in a nearby stream.
The environmental impact of coal ash pollution is significant, and its health risks are now better understood. According to a recent EPA report, coal ash is more hazardous than previously believed, and it could significantly increase a person's cancer risk. This has raised concerns about the safety of places where coal ash has been used as structural fill, such as in Mooresville, where ash has escaped from a sinkhole and protruded through asphalt at Lake Norman High School.
The issue of coal ash pollution in Lake Norman highlights the need for regular monitoring of areas downwind of coal-fired plants and the implementation of measures to mitigate the environmental and health risks associated with coal ash exposure.
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Frequently asked questions
Lake Norman, an artificial freshwater lake in North Carolina, has been the subject of pollution concerns. There have been reports of water pollution, with some areas considered unsafe for swimming and fishing due to contamination by raw sewage, toxic algae, and high levels of PCBs. However, others claim the water is clean and suitable for boating and swimming.
The lake has faced pollution from various sources, including a raw sewage spill, toxic algae, and the presence of PCBs and mercury. Duke Energy's operations and the discharge of coal ash have also been identified as contributing factors.
Efforts to address pollution in Lake Norman include the formation of the Lake Norman Commission, which implements rules to promote water safety. Residents have also taken initiative, requesting state assistance or raising funds to remove algae.
Pollution in Lake Norman has negatively affected the local ecosystem. It has led to the decline of certain species, such as the Carolina heelsplitter, a freshwater mussel sensitive to water quality changes. Sediment pollution and fish population concerns have also been raised.
