De or het waterlevering?

The correct Dutch article is:

de waterlevering

Rule Words ending in -ing: almost always de. See the rule

How to use waterlevering

the waterleveringde waterlevering
this waterleveringdeze waterlevering
that waterleveringdie waterlevering
our waterleveringonze waterlevering
your waterleveringjouw waterlevering
every waterleveringelke waterlevering
which waterlevering?welke waterlevering?
a big waterlevering / the big waterleveringeen grote waterlevering, de grote waterlevering