All Castellbisbal residents over 16 years old have the opportunity to participate in this consultation. They can do so via an online form or in person at various municipal spaces. Additionally, two informative sessions have been scheduled for April 16 and 21 at 7:00 PM in the City Council's plenary hall, where the survey can also be completed in person.

According to the Council, the current Minimum Waste system, implemented in 1997, has achieved nearly 50% selective collection. However, new environmental regulations demand more ambitious targets, exceeding 65% by 2035. These regulations also mandate the segregated collection of metals and plastics, rendering the current system unfeasible and requiring the implementation of separate collection for five fractions.

Considering that this change will have a direct impact on citizens, the City Council has decided to promote this participatory process with the aim of listening to all opinions before making a decision, taking into account the needs and reality of the municipality.

The participatory process presents two main options for the waste collection system in Castellbisbal: maintaining the current structure, with a majority of underground containers, or replacing them with surface containers. The City Council also studied a third model that included door-to-door collection in much of the municipality, but ultimately discarded it due to its high cost.

The key differences between the two proposed models lie in service operation, public space usage, and associated costs. The underground container model requires the replacement of existing equipment and a more manual collection process, but offers better visual integration. In contrast, surface containers allow for more automated collection, although their visual impact is greater.