Mark, France is a big place, you can’t say “generally the quality is quite good” generally isn’t good enough, permanently good is what is required and unless everyone here is your close neighbour your statement means very little. Our water used to be OK now it’s way over the WHO limits for pesticides.
I work on pools across France and the water varies tremendously from area to area.
I want to remove the chlorine/chloramines/trihalomethanes/pesticides etc just before I drink it so I use a filter. If I were permanently in France I would fit a reverse osmosis filter with a UV lamp, smaller much like what the bottled water companies use when they sell bottled water to numpties.