Most modern buildings use PEX (cross-Linked Polyethylene) tubing for water in homes no more copper pipes like years ago. Basically plastic so it may not be very good.
The issue is that all commercial ones have steel, which can possible leach into the distilled water + it's not antibacterial.
But if there is a concerning amount and I took steps to remediate I would want to test afterwards to ensure its working. I'm not just looking for peace of mind, I want to know if I have microplastics and how much.
They've been leeching into the environment for so long that you are no longer just concerned about primary sources contaminating your air, food, and water.
It's homogenized, from the deepest parts of the ocean to the tops of the highest mountains, there are microplastics. It's completely penetrated the food cycle.
If you want to avoid drinking microplastics, you'll have to explicitly remove it from your water.
If you want to avoid eating microplastics... I guess grow your own food in a hermetically sealed bubble and water it with your filtered water.
>Using an average calcium concentration in public water supplies of 26 mg/liter and a maximum of 145 mg/liter (Durfor and Becker, 1964) and assuming that the average adult drinks 2 liters of this water daily, then the drinking water could contribute an average of 52 mg/day and a maximum of 290 mg/day. On an average basis this would represent 5% to 10% of the usual daily intake or approximately 6.5% of the adult RDA.
>Therefore, typical drinking water in the United States, Canada, or Europe provides approximately 3% to 7% of the RDA for magnesium intake by a healthy human.
https://www.ncbi.nlm.nih.gov/books/NBK216589/
I don't think 5% of the RDA really moves the needle either way and those are the major minerals in tap water.
I feel better going back on tap water, fewer stomach issues. I don't have a proper theory that can explain why this is the case, but it's certainly the case.