De or het waterverspilling?

The correct Dutch article is:

de waterverspilling

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

How to use waterverspilling

the waterverspillingde waterverspilling
this waterverspillingdeze waterverspilling
that waterverspillingdie waterverspilling
our waterverspillingonze waterverspilling
your waterverspillingjouw waterverspilling
every waterverspillingelke waterverspilling
which waterverspilling?welke waterverspilling?
a big waterverspilling / the big waterverspillingeen grote waterverspilling, de grote waterverspilling