English Abstract A global overview will be given of the water quality of
the private-groundwaterwinnings in the Netherlands. Although the overview
is far from complete, is becomes apparent that the water quality of most
winnings does not satisfy the legally established requirements for drinking
water. Especially, the high nitrate concentrations and the low pH-value,
due to acidification (and related to this, the concentrations of aluminium)
are the cause of the water not satisfying the requirements. Also
three-dimensional groundwaterflow and matter transport will be modelled near
an abstraction site. Concentration-courses are calculated for nitrate and
atrazin, for two types of scenio's. In the first type, no reduction or
prohibition measures will be taken. In the second type, these measures will
be taken in 1995. It becomes apparent that after 15 years, these measures
will have their full effect.