Plastic pipes are polluting drinking water systems after wildfires
theconversation.com
theconversation.com
Before PEX, copper was king for house water pipes. It's still used a lot, but the main argument for not using it is labour costs - PEX is flexible, copper needs skill to bend it. However copper also leeches into water! But copper is an essential nutrient, so it may actually be beneficial, but at high levels it is toxic.
Ie. Your faucet at home boils and recondenses all water before you put it in your glass.
Humans only drink a couple of liters of water per day, so the energy cost isn't large.
Then you don't need to worry about keeping massive pipe networks and storage tanks 100% sterile or pure.
A better question would be: Are there dangerous levels of contaminants in after a single distillation pass? For municipal water - probably not. For chemical factory effluent - probably yes. Plastic pipes after wildfires - no idea.
Also, you need to add something to distilled water, as it's shocking to a body. Almost anything will do, though you may need to think about mineral content in the longer term.