The Hidden Environmental Cycle of Waste and Precipitation
In our modern society, we often operate under the “out of sight, out of mind” principle for our waste. We throw items in the trash, and they disappear to a landfill; rain falls on our streets and disappears down a storm drain. However, for “forever chemicals” (PFAS), these traditional systems of disposal and drainage are not endpoints, but rather waypoints in a global cycle of contamination. Understanding how stormwater and landfills coordinate to spread these persistent chemicals is essential for every community. To begin your journey of awareness, you can first explore what are pfas and why their chemical construction makes them so uniquely mobile in the hydrologic cycle.
The primary reason landfills are a major concern is the creation of “leachate.” As rainwater filters through thousands of tons of waste—which includes PFAS-treated textiles, non-stick cookware, and grease-resistant packaging—the water picks up various pollutants, creating a toxic chemical soup. While modern landfills use thick plastic liners to capture this liquid, these liners eventually degrade or can be compromised, allowing the leachate to enter the surrounding soil and groundwater. This leads to a persistent water contamination that can haunt an area for centuries after the landfill has closed. According to the EPA, old landfills with compromised liners are some of the most significant legacy sources of PFAS in our environment today.
Stormwater: The Urban Delivery System
Stormwater acts as the primary “delivery system” for PFAS in built-up environments. When rain falls on our roads, parking lots, and industrial roofs, it washes away a century’s worth of accumulated pollutants. PFAS are used in everything from high-performance automotive waxes to industrial sealants and fire-suppression systems. During a heavy rain event, these chemicals are “scoured” from the urban landscape and washed directly into local streams, rivers, and groundwater aquifers. This is a primary way where pfas come from and how they end up in suburban areas. Identifying health exposure risks for communities downstream from major urban runoff points is a priority for state health departments.
Furthermore, stormwater management often involves “retention ponds” designed to catch runoff and let it sink slowly into the ground. While this prevents flooding, it creates a direct path for PFAS to enter the deep groundwater that supplies our wells. Because these chemicals are indestructible and highly soluble, they don’t get filtered out by the dirt—they simply move with the water. Research from the CDC (ATSDR) has shown that stormwater infiltration is a major factor in the widespread contamination of suburban drinking water supplies. Identifying pfas in products that we use in our backyards and on our cars is a vital step in reducing this environmental cycle.
Improving Our Infrastructure and Awareness
Addressing the threat of landfill and stormwater contamination requires a massive shift in how we manage our environmental resources. On a community level, this means investing in more advanced landfill liners and leachate treatment systems that can specifically target PFAS. For those at home who prioritize reducing pfas at home, the focus should be on proper waste disposal. Never throw hazardous chemicals—like old non-stick treatments or industrial sealers—directly into the household trash. Experts at the NIEHS are currently researching new ways to neutralize “forever chemicals” within landfill leachate, providing data that can help municipalities build safer disposal sites. Stay updated with research from high-authority sites like NIH research portals to see how waste management science is evolving.
Protecting Our Shared Water Future
The cycle of waste and water is one of the most fundamental systems on Earth. By understanding how our industrial legacy interferes with this cycle, we can take informed action to protect our shared environment. Our communities should be the place where we are safest, and by taking control of our environmental footprint, we can ensure they stay that way for generations to come. Awareness is our best tool for Ensuring that the systems we use to manage our waste don’t become the systems that poison our water. The future of environmental health depends on our ability to fit our industrial products back into the natural cycle of the Earth.