I really don't see a need take these extra precautions.
We wash our clothes, our dishes, and our hands in tap water. In some places we even drink tap water.
It's tap water, we use it to wash things.
I agree, but we are stoners and this is precious cargo. What if ....
As a precaution I would check the PH and that's it. Luke warm water helps to dissolve the baking soda. I think that's about it. Cold tap water is good for the final rinse. No need to over think this.