There have quite amount of earthworms coming from the toilets and bathrooms. Need an urgent solution to get rid of these once and for all.

Where are you located ? What type of sewer system,

Do you mean they are actually coming out of the toilet ? Or are they just coming out of the floor around the toilet?

They may be roots in the sewer at your regular hardware store there is a root killer in Chrystal form follow directions on the box it is applied in the toilet .
If like Fr Chuck said it is from around the toilet, the sealer under your toilet need to be changed.
Good luck