Austin Asphalt: Is Road Runoff Brewing Liver Yeast?

By Franklin Everett Shaw

December 22, 2025

The air in Austin shimmers with a unique blend of live music, breakfast tacos, and… potentially, asphalt-derived toxins. While the first two are celebrated, the last is a silent threat that deserves our attention. Could the very roads we drive on be contributing to a higher risk of fungal liver infections for Austin residents? It’s a question that demands investigation, and the answer might surprise you.

Asphalt, the black gold of our roadways, isn’t just inert rock and tar. It’s a complex cocktail of polycyclic aromatic hydrocarbons (PAHs) and other volatile organic compounds (VOCs). These chemicals, released during asphalt production, application, and even everyday wear and tear, can leach into the environment, contaminating soil and, crucially, water sources.

Austin, with its sprawling network of roads and frequent heavy rainfall, is particularly vulnerable. Rainwater washes these toxins off the asphalt and into our creeks, rivers, and ultimately, the water supply. While treatment plants remove many contaminants, some PAHs and VOCs can persist, especially during periods of heavy runoff when treatment systems are strained.

Now, let’s connect the dots to fungal liver infections. While not a direct cause-and-effect relationship, exposure to certain environmental toxins, including some found in asphalt, can weaken the immune system and disrupt the gut microbiome. A compromised immune system makes individuals more susceptible to opportunistic fungal infections, including those affecting the liver.

Aspergillus, for example, is a common mold that can cause invasive aspergillosis, a serious infection that can affect the lungs, sinuses, and even the liver. While Aspergillus spores are ubiquitous, individuals with weakened immune systems are at a significantly higher risk of developing invasive infections.

So, what are the symptoms of a fungal liver infection to watch out for? They can be subtle and easily mistaken for other ailments, making early detection crucial.

Persistent fatigue and weakness.
Unexplained weight loss.
Jaundice (yellowing of the skin and eyes).
Abdominal pain, especially in the upper right quadrant.
Fever and chills.
Nausea and vomiting.

If you experience any of these symptoms, especially if you have a compromised immune system or pre-existing liver condition, consult a doctor immediately. Early diagnosis and treatment are critical for successful outcomes.

But what can Austinites do to mitigate their exposure risk? Here are some actionable steps:

Filter Your Water: Invest in a high-quality water filter certified to remove VOCs and PAHs. A whole-house filter is ideal, but even a point-of-use filter for your drinking water can make a difference. Look for filters with activated carbon, which is effective at adsorbing many organic contaminants.
Be Mindful of Runoff: Avoid contact with stormwater runoff, especially after heavy rainfall. Don’t let children play in puddles or creeks near roadways. Wash your hands thoroughly after any potential contact with runoff.
Support Green Infrastructure: Advocate for the implementation of green infrastructure projects in Austin, such as rain gardens, bioswales, and permeable pavements. These systems help filter stormwater runoff and reduce the amount of pollutants entering our waterways. The city of San Antonio, for example, has implemented extensive green infrastructure projects along the San Antonio River Walk, demonstrating the feasibility and effectiveness of these solutions.
Choose Organic Foods: While not directly related to asphalt exposure, reducing your overall exposure to environmental toxins can help strengthen your immune system. Opt for organic fruits and vegetables whenever possible to minimize your intake of pesticides and herbicides.
Support Local Research: Encourage local universities and research institutions to conduct studies on the impact of asphalt-derived toxins on public health in Austin. More data is needed to fully understand the extent of the problem and develop effective mitigation strategies.
Consider Air Quality: PAHs and VOCs from asphalt can also contribute to air pollution. Invest in an air purifier with a HEPA filter and activated carbon to remove airborne pollutants from your home.
Advocate for Sustainable Road Construction: Support the use of more sustainable road construction materials and practices, such as recycled asphalt pavement (RAP) and warm-mix asphalt. These alternatives can reduce the release of harmful toxins during road construction and maintenance.

One common pitfall is assuming that municipal water treatment plants remove all contaminants. While they do a good job, some chemicals can still slip through, especially during peak runoff events. Another mistake is underestimating the cumulative effect of exposure to low levels of toxins over time. Even small amounts of PAHs and VOCs can accumulate in the body and contribute to health problems.

The challenge lies in the fact that the link between asphalt toxins and fungal liver infections is complex and multifactorial. It’s not a simple case of “asphalt causes liver infections.” Instead, it’s a matter of increased risk due to a combination of environmental exposure, individual susceptibility, and other lifestyle factors.

However, by taking proactive steps to reduce our exposure to asphalt-derived toxins and supporting efforts to improve water quality and air quality in Austin, we can help protect ourselves and our community from potential health risks. It’s about being informed, being vigilant, and being proactive in creating a healthier environment for all Austinites. The health of our livers, and our community, may depend on it.