Drinking water

They say it's safe to drink, but have you ever seen inside of a water supply pipe? For the price of bottled water, I wouldn't want to drink tap water unless you run it thru a purifier first.

Yes, it’s quite safe to drink.

I guess you haven't seen inside water supply pipe?

https://www.balkanplumbing.com/nyc-water-main-pipe-material-tutorial/

It's why I drink beer, I mean bottled water.

Go into the supermarket and notice local Spanish all buy bottle water that tells you som

Scaremongering picture from an American /New York company referring to USA conditions? Not quite related to Spain.

All water supplied in EU has to conform to health standards. Anyone is free to test their water.

What is a problem is that the mineral content can make the water taste different. Installing various filters can rectify that

Not really scare mongering, just first picture I found showing state that all water supply pipes get into after a few years. But if you’re happy with tap water, carry on. 

All I can say is the people that say it’s scare mongering you just caryon drinking the tap water but don’t try and persuade other people to drink it 

Seems I opened a hornets nest ... I think this has diverted from the OP question of drinkability of tap water . The answer is yes, and if that's not a good enough answer, ask the ayuntamiento or water authorities. The taste of water is something different.  It is entirely up to anyone to drink it or not

As a sidenote , when working in a different country I came across the source of the water for our water fountain (tower) in our office, it was being tapped from a little room in a neighbouring cellar in the middle of the city. Pure council water .....

If you have any doubts about drinking the local water maybe look into getting a filtration system installed. Prices will vary and suppliers are numerous.  

As was pointed out many Spaniards buy bottled water but they may also live where the water supply is high in mineral content making the water taste manky. I know one family that even use bottle water for cooking. I used local water for a few months and noticed a tang off of the water but figured I would get used to it. This was until one morning I looked into the kettle and seen the amount of sediment on the bottom from the minerals in the water. 

There is also the question of supply regularity I  got exasperated some mornings going to make a coffee and finding there was no water in the taps it does not happen often but the water companies or local concils will cut off the supply, without any warning. This is while they are working on either the roads or pipes. So having a supply to hand is, imho, a neccessity in Spain. 

Then there is the envirometnal inpact of all that plastic don't get me wrong I am not the tree hugging type  but I recycle everything. 

But some do not. I have seen many people also just dump the plastic in the general bins. Where i live there are a general garbage bins everywhere but as for plastics and paper bins there seems to be no rhyme of reason for thier placement. You will see a general bin and maybe a bottle one or an oil one together. It is rare around here to see them all in one spot. So if you do not have a car , or just couldn't be ar**d,  to bring them to the correct ones I guess throwing into the general is better than just dumping it. 

 So the recycle rational for buying plastic bottles water doesn't hold water.