When water does reach a house, only about 5-20% is used for cooking or drinking - the rest for watering plants, showers, toilet flushing, washing.
Is it better to just outfit each home with an under-sink reverse osmosis machine and pipe in raw reservoir water?
and all the RO membrane cartridges, or millipore filter cartridges are contaminated with PFAS, anyhow. it's literally everywhere. We have to run ours for 30 minutes before taking the ultra-pure water at the lab to drop the levels down to 'baseline'. Otherwise, the built up levels blow out the instruments.
These filters only slow down the contamination relative to water flow rate. Think Of them as big chromatography columns or frontal analysis columns