How do sanitary landfills differ from open dumps?

Sanitary landfills and open dumps are fundamentally different in their engineering, environmental impact, and safety standards.

Open dumps are uncontrolled disposal sites where waste is simply piled on the ground. These sites historically served as breeding grounds for disease-carrying pests like rats and flies, and they frequently generated unpleasant odors, windblown debris, and hazardous pollutants that contaminated groundwater and nearby surface water.1

In contrast, sanitary landfills are carefully planned, engineered facilities designed to minimize environmental risks. Key differences include:1

• Containment: Sanitary landfills use impermeable synthetic bottom liners and compacted clay to prevent leachate—a contaminated liquid byproduct—from seeping into the groundwater.231
• Waste Management: Waste is deposited in thin, compacted layers and covered daily with soil to control odors and pests.21
• By-product Control: Modern landfills feature systems to collect and treat leachate and to manage methane gas, which is often recovered for use as fuel.31
• Land Reclamation: Once completed, sanitary landfills are capped with impermeable layers and topsoil, often allowing the land to be repurposed for public projects like parks or golf courses.214