Inert waste is waste that does not undergo any significant physical, chemical or biological modification : Inert waste does not decompose, burn or produce any other physical or chemical reaction, is not biodegradable and does not deteriorate other materials with which it comes into contact in a way that could lead to environmental pollution or harm human health. In practice, and according to the modified Grand-Ducal regulation of 24 February 2003 concerning the landfill of waste, waste that can be considered inert waste is - made up almost entirely of natural soil and rock resulting from their extraction during construction work; - resulting from road works and of a mineral nature; - from construction, renovation or demolition sites, which are mainly of a mineral nature. One condition is that the inert waste is not contaminated by hazardous substances or other potential nuisance generators.

The operators of wastewater treatment plants with a capacity greater than 2,000 population equivalent units send an annual report to the Administration of the environment which includes, among other things, the quantities of sludge produced, the composition and characteristics of the sludge and the destination of the sludge.

Geographic location identifying the places where sewage sludge is treated on land