**Atlanta's Algae: Is "Green" Foam Hiding Deadly Mold?**

Photograph of Franklin Everett ShawBy Franklin Everett Shaw
December 31, 2025

The Chattahoochee River, a vital artery for Atlanta and the surrounding areas, is facing a concerning issue: the appearance of strange, green foam. This isn’t your average bubble bath overflow; it’s raising alarms about potential toxic mold and harmful algae blooms, threatening the health of both people and pets. Ignoring this could lead to serious health consequences and long-term damage to our local ecosystem. We need to understand what this foam is, what risks it poses, and what we can do about it, now.

The green foam spotted in Atlanta waterways isn’t always cause for panic, but it always warrants investigation. Benign foam, often white or slightly off-color, is a natural occurrence. It’s created by the breakdown of organic matter like leaves and twigs, agitated by wind and water. This type of foam tends to dissipate quickly and doesn’t have a strong odor.

Harmful algae blooms (HABs), on the other hand, are a different beast. These blooms, often blue-green or bright green, can produce toxins harmful to humans and animals. The foam associated with HABs is often thick, persistent, and may have a musty or earthy smell.

Distinguishing between the two is crucial. Look for the color: intensely green or blue-green is a red flag. Observe the texture: thick, scummy foam is more concerning than light, bubbly foam. Sniff the air: a foul odor suggests a potential problem.

If you suspect a harmful algae bloom, do not touch the water. Keep children and pets away from the area. Report the sighting to the Georgia Environmental Protection Division (EPD) immediately.

Toxic mold is another potential concern, though less directly linked to visible foam. Mold thrives in damp environments, and waterways can certainly provide that. While not always visible as foam, mold can release spores into the air, causing respiratory problems and other health issues.

The connection between the green foam and toxic mold is indirect but important. Algae blooms can create conditions that favor mold growth. Decaying algae provide a food source for mold, and the increased humidity around affected waterways can exacerbate the problem.

Protecting yourself and your pets requires vigilance and proactive measures. Avoid contact with any suspicious-looking water. This is especially important for children, who are more likely to ingest water while playing.

When walking near waterways, keep pets on a leash and prevent them from drinking the water. Algae toxins can be deadly to animals, even in small amounts. Wash your hands thoroughly after any contact with river water or sediment.

If you experience symptoms such as skin irritation, respiratory problems, or gastrointestinal issues after exposure to potentially contaminated water, seek medical attention immediately. Inform your doctor about the possible exposure to algae toxins or mold.

Reporting suspicious water conditions is vital for protecting the community. Contact the Georgia EPD to report any unusual foam, discoloration, or odors in local waterways. Provide as much detail as possible, including the location, date, time, and a description of the observed conditions.

The EPD investigates reports of potential pollution and takes action to protect public health and the environment. They may collect water samples for testing and issue warnings to the public if necessary.

Atlanta residents have several resources available to stay informed and get involved in protecting our waterways. The Chattahoochee Riverkeeper is a non-profit organization dedicated to protecting and restoring the Chattahoochee River basin. They offer educational programs, volunteer opportunities, and advocacy efforts.

The City of Atlanta Department of Watershed Management also provides information about water quality and conservation. Check their website for updates on local water conditions and tips for protecting our water resources.

One common mistake is assuming that all green water is dangerous. While caution is always warranted, not every algae bloom is toxic. However, it’s always better to err on the side of safety and report any suspicious conditions.

Another pitfall is underestimating the potential health risks. Algae toxins can cause a range of symptoms, from mild skin irritation to severe liver damage. Don’t dismiss symptoms as allergies or a minor illness; seek medical attention if you suspect exposure.

A specific challenge in Atlanta is the urban runoff that contributes to water pollution. Rainwater washes pollutants from streets, parking lots, and construction sites into our waterways. Reducing runoff through practices like rain gardens and permeable pavement can help improve water quality.

Consider the case of Lake Lanier, a major drinking water source for Atlanta. In recent years, Lake Lanier has experienced several harmful algae blooms, raising concerns about the safety of the water supply. Increased monitoring and proactive management strategies are needed to prevent future blooms and protect our drinking water.

Another example is the South River, which has suffered from decades of pollution from sewage overflows and industrial discharges. Efforts are underway to restore the South River, but it will take time and sustained commitment to fully address the legacy of pollution.

For those living near the Proctor Creek watershed in Northwest Atlanta, the challenges are particularly acute. This area has historically faced significant environmental justice issues, with residents disproportionately affected by pollution and flooding. Community-led initiatives are crucial for addressing these challenges and ensuring a healthy environment for all.

Taking action at the individual level can make a difference. Reduce your use of fertilizers and pesticides, which can contribute to nutrient pollution in waterways. Properly dispose of pet waste to prevent bacteria from entering the water.

Support local organizations working to protect our waterways. Volunteer your time, donate to their cause, or simply spread awareness about the importance of water quality.

The green foam in Atlanta’s waterways is a reminder that we must be vigilant about protecting our environment. By understanding the risks, taking precautions, and reporting suspicious conditions, we can help ensure clean and healthy water for ourselves, our pets, and future generations. Let’s work together to keep the Chattahoochee and other Atlanta waterways safe and thriving.

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