Apulia, in the absence of surface water, is one of the Italian regions which satisfy their water requirements by
drawing large quantities (over 40%) of its water from underground resources. The large amounts drawn from these resources
in the last few years due to increasing human activity on the territory has determined a general and inevitable reduction
of the quality of the underground water resources although they circulate in hydrogeological and geostructural environments
characterised by a low intrinsic vulnerability. This is particularly true in the Brindisi Plain: a large portion of
territory between the Serre Salentine and the Adriatic Sea. The area examined is characterised by the existence of two distinct
hydrogeological environments one overlying the other; in the underlying one, made up of Mesozoic carbonate deposits,
there is a groundwater body of significant size which satisfies about 30% of the requirements; in the one overlying
this, made up of Quaternary calcarenite-sandy deposits, there is a groundwater body of reasonable local importance. For
each aquifer, the study evaluated the intrinsic vulnerability using a parametric model, SINTACS, standardised for Italy
and modified by the authors in order to adapt it to the particular characteristics of the examined zone. The information obtained
in this way was then compared with the quality of the waters circulating in these aquifers. The investigations
showed the generally good quality of the waters circulating in the carbonate aquifer and the presence of pollution by nitrates
in the vicinity of some wells. By analysing the maps drawn up and from the information collected in situ, it was
possible to ascertain that widespread forms of underground water pollution can be blamed on the poor execution of drilled
wells and on the lack of suitable management criteria of the groundwater bodies.
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