V izjavi Ministrskega seminarja o podzemnih vodah, ki je bil leta 1991 v Haagu, je bila priznana potreba po ukrepanju, da se prepreči dolgoročno poslabšanje kakovosti in zmanjšanje količine sladke vode, ter se je pozvalo, da se do leta 2000 izvede program ukrepov za trajnostno upravljanje in varstvo sladkovodnih virov.
The declaration of the Ministerial Seminar on groundwater held at The Hague in 1991 recognised the need for action to avoid long-term deterioration of freshwater quality and quantity and called for a programme of actions to be implemented by the year 2000 aiming at sustainable management and protection of freshwater resources.