The ash and debris that remain on properties affected by wildfires on Maui pose a threat to human health and the environment. The ash and debris can contain harmful contaminants like asbestos, lead, and arsenic. If disturbed by wind, rain, or reentry activities, humans can be exposed to harmful chemicals. Harmful chemicals can also enter the local ecosystems, endangering wildlife, coral, and potentially entering the food chain.

EPA has reviewed proprietary data on Soiltac®, the soil stabilizer selected for use on Maui, and confirms that it is non-toxic. The agency believes that applying a soil stabilizer is more protective of public health and the environment than leaving ash and debris as-is. Application of a soil stabilizer helps reduce inhalation risks and the spread of ash to water or surrounding properties. EPA will apply soil stabilizers to the ash and debris footprints of buildings in Lahaina in coordination with Maui County and local officials. EPA will supervise the application of soil stabilizers, ensuring all health and safety guidelines are followed to adequately protect residents and workers.