Why does tap water have a relatively high conductivity compared to distilled water, which has lowconductivity?

Answer 1

Tap water has more minerals and chemicals in it, which aid in conductivity. Pure water, without any other elements other than two hydrogens and one oxygen, won't conduct.

Answer 2

The cleaning process of the water does not remove any of the salts. Salt in the water helps conductivity. Also makes the water hard.

Answer 3

tap water contain lots of dissolved ions while distilled water has no dissolved ions but only little H+ and OH- ions which is from self-ionisation of the distilled water.
more ions means high conductivity