The indicator describes the status of the 42 Contaminated Sites of National Interest (SIN), which together cover 148,594 hectares of land surface (0.49% of the Italian territory) and 77,136 hectares of marine areas. This issue affects all Italian regions, except Molise. As of 30 June 2024, for 65% of the total area of the 36 SINs under consideration, information is available on the progress of the procedures: characterization has been completed for 59% of the soils and 55% of the groundwater, while remediation/safety measures have been approved by ministerial decree for 13% of the soil area and 17% of the groundwater. Procedures have been completed for 17% of the soils and 6% of the groundwater. The information provided by the indicator outlines a representative picture of environmental conditions and societal responses in relation to regulatory and sustainability objectives.