illegal dumping[1]​[2]​ or also called illegal waste,[3]​ refers to waste that is dumped illegally, instead of using authorized methods such as garbage collection or the use of authorized "Landfill (garbage)" garbage containers. It is the clandestine deposit of any waste on earth, including garbage dumped in places without a license to accept this type of waste.[4]​[5]​.

Illegal emptying of garbage is differentiated by throwing garbage on the streets, by the type and amount of material and/or the way in which it is disposed. Also, it is the action of carelessly or casually throwing garbage in places that are not permitted.[6]​.

High taxes on landfills in the UK have led to illegal dumping of rubbish. The materials that are illegally dumped vary between organic matter, household garbage, abandoned cars and even construction material. In this wide variety of wastes, many are considered hazardous or toxic waste.

As the cost of disposing of household trash has increased, the number of individuals and businesses illegally dumping trash has also increased. Therefore, the UK government has made it easier for community members to report cases of illegal littering.[7]​ The fine or punishment is usually defined by the council operating in the local area where the illegal littering problem is occurring. BBC confirms that this problem costs the council of England and Wales more than £50m annually (2016).[8]​.

Open-air dumps, or open sky, are locations where illegal garbage is discarded or abandoned in piles of waste and debris in abundant quantities. Fines, or penalties, are a common punishment for a person who is caught dumping illegal trash in an open-air dump. It is common to find this type of dumpsites in forests and abandoned buildings; these are usually closed shortly after being created, however, the majority of dumpsites that are located in forests or public spaces without adequate public services continue to operate for indefinite periods of time.