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The one that concerns me personally is the whole wastewater recycling directly to drinkable tap water.

Between micro-plastics from washing machines to medicine disposal, the long term unknowns to human health seem to be significant, not to mention the potential for human error.

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Microplastics are one of the easier things to filter out from water though, compared to other nasty things, like pharmaceuticals or arsenic or PFAs.

Although I think it will get to that point where we will have to use distillation machines for drinking water/cooking, unfortunately.

PFAS is able to be removed via reverse osmosis which direct potable reuse facilities utilize, so not really a problem

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