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>The reason is because although it is not technically difficult to "unhook a toliet" as you say it is even easier (especially now with the advent of Home Depot and Amazon selling all manner of "plumbing contraptions") to inadverntly create a potential cross conection.

Please tell us how one can screw up hooking up a toilet so badly as to create a cross connection. It's not easy to confuse a 3" or better closet flange with a 3/8" compression fitting, and it would be pretty obvious to anyone who tried it.

> Please tell us how one can screw up hooking up a toilet so badly as to create a cross connection

Sure: unless you understand potable water and drainage systems, proper appurtenances, proper methods and materials I don't want you touching my drinking water supply. It's the same reason you don't want me typing random characters into your code. I'm not a coder, you're not a plumber.

And to be clear I used domestic water as an example, you could just as easily mess up the sanitary connection and have raw sewage seeping into the building.

It takes 8 years of working experience before you are even allowed to take a Master Plumbing test... and we aren't stupid people. There is A lot know.

So, no then.

>It takes 8 years of working experience before you are even allowed to take a Master Plumbing test... and we aren't stupid people. There is A lot know.

Never said plumbers were stupid. But we're talking about replacing an existing fixture with a functionally identical replacement. If you try to tell me that needs a licensed Master plumber, I'll know exactly what your motives are.

What about unhooking a toilet? Or installing a new kitchen faucet? Filling gasoline into your car is extremely dangerous too, which is why in Oregon and New Jersey trained professionals are the only ones allowed to perform the task.

>trained professionals

Ha ha! Wait, you are joking right? I live in Oregon and they are about as trained professionals as the teenager working at McDonalds is a trained Michelin chef.

Yes, they're using sarcasm to ridicule their parent comment's claim that someone hired to just unhook a toilet should legally NEED to be a licensed plumber, by comparing it to similarly low-skill tasks "needing" to be highly trained in case something goes wrong.

I don't understand. They had a machine for washing parts where the water intake for the machine was pulling from an open container with the plating solution? How does this contaminate the building's water?

I think it's the case where the water supply (out of the wall) had an open hose that dropped down into a basin and at the bottom, made physical contact with a resting pool of cyanide-containing fluid.

Capillary action could possibly induce the cyanide fluid up into the hose, and/or backwash/turbulence could mix fluids inside the hose, and in just the wrong conditions, could result in some cyanide back-flowing up to the piping, to be distributed elsewhere in the building. As an extreme layman, I'd assess that as unlikely but at least possible.

I'm not following; you want separate plumbing lines entirely to feed sinks, outlets and toilets? I can't picture a single residential facility that doesn't have a shared feed, nevermind a corporate complex designed for efficiency.

>no vacuum breakers no RPZ's (reduced pressure zone devices) nothing to protect the water supply from siphoning Cyanide back into it

Not even the shutoff valve? There should be constant pressure behind the hose beyond it.

You need an anti-siphon design, of some sort.

Direct hose connections can result in back-contamination. A drop-fill won't do that. There are anti-siphon designs, they are less assured as they may still fail.

https://www.thespruce.com/anti-siphon-faucet-1824942