The integrated water cycle


Transformation of natural water from the reservoirs or other collections into water suitable for human consumption.

The transformation of the natural water coming from the reservoirs and other collections into water suitable for human consumption is achieved through the different processes carried out in the drinking water treatment plants (DWTP).

Both the surface water and groundwater supplied in the Community of Madrid are already of high quality at source. This quality is improved in the DWTP whose annual treatment capacity and technology allow treatment of water from any supply source.

Read a PDF about drinking water treatment

Relevant data


4.5 hm3/day treatment capacity

1.4 hm3/day capacity of Colmenar DWTP

Did you know …?


The Greeks (Fifth century) recommended the filtering and boiling of water before its ingestion in order to avoid diseases.

The biggest water treatment built up until that time was constructed in Paris in 1806, its process consisted of letting the water settle for 12 hours before filtering it through sand and carbon.

The Torrelaguna DWTP is the oldest in the Community of Madrid, it entered into service in 1967.

The usual sequence of processes that the water is subjected to before consumption is: pre-oxidation, coagulation and flocculation, settling, filtration, neutralisation and final disinfection.