Because lead is hugely toxic, and can leach into the water, thereby poisoning whoever drinks it.
PVC pipes do not corrode, hence these are used for drinking water supply.
The Safe Drinking Water Act (SDWA) Section 1417(a)(1) required that after June 19, 1986 only "lead free" pipe, solder or flux could be used in the installation or repair of any plumbing in residential or non-residential facility providing water for human consumption, which is connected to a Public Water System.
Safe drinking water usually comes from the lakes or
In most communities, tap water is safe for drinking.
Rust in water can come from either deteriorating pipes or water with a high iron content, but if the water smells OK it is probably safe. Rust itself is not toxic for bathing, although drinking it could lead to too much iron in the body and possible liver damage.
It is safe, but it will rot out. It is used to prevent electrolysis, but that is pretty much it nowadays. Pex is more commonly used for water pipes.
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using a safe fountain for clean drinking water
Ledc waters are not safe because of poor water systems and lack of hygine whichh means that waterbourne diseases are spread through out the community where water is being used; this can lead to cholera and dysentry
NO
boil it
Any solder / brazing alloy that is LEAD FREE according to the safe water drinking act of 1974