Alrighty then, you do realize that just because you don't need to Ph your water doesn't mean other people don't...like I said your water source is probably well within the acceptable range I would know mine is too. I'm growing in organic soil and apart from a little Sweet Raw I add to my water I don't Ph my tap water either. Others though like OP stated can have super high tap Ph like 9 and that will cause issues for your plant if your soil doesn't have buffers in it like peat or lime.
And how would it not been an organic grow? Are you some kind of purist where if one salt based additive is used then the term organic is just thrown out the window? If you think about it everything we use for our plants are derived from an "organic" resource. When the plant eats worm casting or slurps up concentrated nitrogen it doesn't discriminate between the two it just sees food.
Also flushing is a myth (
https://www.rollitup.org/t/the-truth-about-flushing.409622/) and if you need to check soil Ph you need a soil Ph meter run-off Ph doesn't tell you anything. Seriously read the WHOLE post I just linked and you'll see what I am talking about with the flushing. All you're doing is depriving your plant of nutrients at a critical point in it's life and harming your finished product. Nutrients aren't stored in the buds they are stored in the roots, etc, etc you'll see it.
