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.

The indicator provides information on sites subject to regional remediation procedures, based on data extracted from regional registries and databases. In 2023, 38,556 sites were registered, of which 22,191 have completed the remediation process.

For 62% of the sites, at least one surface area value (administrative or technical) is available. The sites for which the administrative area is known number 21,711, equal to 56% of the procedures. Among the ongoing procedures, 59% of the sites are in the notification phase, 21% are developing or have developed the conceptual model, while 20% have approved interventions.

For 97% of the sites with ongoing remediation procedures, the contamination status is known: 6,400 are potentially contaminated, 3,974 are contaminated, and 5,502 are awaiting analytical assessments. Among the concluded procedures, in only 30% of cases was an intervention necessary, while in the remaining 70% the procedure concluded without any intervention.