It doesn’t matter if our friendly pets such as dogs and cats drink water in this sort of place because they don’t compromise the good functioning of the system.
Traps are healthy for a great number of species such as birds, bees which come and drink and also dragonflies… and allow the latter to return to our environment.
The trap is also a laying place for dragonflies which eat mosquitoes. Dragonflies are carnivorous, they eat grubs and young fishes; but this doesn’t change the good balance of the trap. Mosquitoes’ grubs are mimetic thus million fishes can’t eat them; hence the necessity to have traps equipped with an anti-drowning system for animals and young children.