We are the largest landfill in El Salvador, with more than 20 years of experience in Solid Waste Management; under the administration of a Mixed Economy Society, made up of private equity investors and the Council of Mayors of the Metropolitan Area of San Salvador (COAMSS).


What drives us


To be a leader in Comprehensive Waste Management, making El Salvador the Model to follow for the Protection of Health and the Environment in Central America.


Improve the quality of life of the Salvadoran population through the integral management of solid waste with cutting-edge technology.


Our history

MIDES was born as an integral solution for the care of the environment and public health, ordering the processes in the management of solid waste, under international standards and quality certifications.

The problem of solid waste in El Salvador began in 1989, when various municipalities of the metropolitan area of San Salvador deposited an average of 900 tons of waste per day in an open-air dump, located in an old white earth quarry, known publicly as Mariona's dump.

In the short term, this site became one of the most problematic sources of environmental contamination in the country, due to the absence of measures that would guarantee the protection of the environment and therefore the health care of the population.

A decade later, a study carried out by the Lutheran University revealed the environmental damage generated by the Mariona Dump, identifying a serious contamination generated by the liquid resulting from the fluid percolation process, called leachate; above all, in the waters of the Chacalapa stream, in the department of Cuscatlán, and in most of the wells around the site. To the above, methane gas emissions were added, which caused accidents and explosions in said area.

On December 2, 1997, after having carried out all the necessary studies for the opening of a safe and healthy sanitary landfill for the environment, the creation of the Mixed Economy Society Integrated Solid Waste Management (MIDES) was created.

In 1997, it was concluded that the Mariona Landfill had collapsed and therefore, the search for a new site began to properly dispose of solid waste.


Thanks to innovative processes, cutting-edge technology and high quality standards, we have managed to give the landfill a useful life of up to 50 years.

The main objective was to build a Sanitary Landfill that, under International Environmental Standards, would apply a new program for the Comprehensive Management of Solid Waste in El Salvador and, in addition, will implement cutting-edge programs in its operation, among these, the installation of geomembranes, the treatment of leachates and a laboratory with state-of-the-art processes.

The MIDES Landfill is located in the municipality of Nejapa, in the department of San Salvador, began operations in 1999 and to date, more than 9 million tons of solid waste have been treated, working for a diversity of customers.

The Nejapa landfill has a total of 15 cells plus four lagoons with a capacity greater than 50 thousand cubic meters. At the bottom of the cells, a compact layer of clay is built, where a uniform earthwork is made. It is followed by a geomembrane, a type of carpet that waterproofs the soil and prevents the aquifers from being contaminated.

The geomembrane is specially welded to prevent leaks. Above it, the leachate collection and treatment system is installed, which is made up of tubes that drain the leachate, which are transported to the oxidation ponds where they are treated.