Good for what? A hammer is good for driving a nail, but not good for driving a screw.

Safe for what? My house is safe for humans, but not safe for tropical birds.

Clean enough for what? Our water is clean enough to wash my ass, but not clean enough to wash a telescope mirror.

Sorry but life is not a Disney movie where some things are unequivocally good/safe and other things are unequivocally bad/unsafe. There are gradients and conditions, and communication requires a shared language between participating parties to navigate them.