As I was doing the first half of the Coffee Exchange[sup]*[/sup] this morning, my mind got to wondering. In all but a very few cases, I have always seen the flush handle on the left hand side of the toilet or urinal.
We might need to clarify left and right here. I suspect the OP was meant left as he was facing the toilet. Sitting on the toilet, or facing away from it (shorter path for used toilet paper to travel) the flush would be on the right.
On my toilet, and most I’ve seen, it’s on the left as you’re looking at the toilet. Sitting on or facing away from, it would be on your right.
Missed the edit, but I don’t agree with the OP’s observation, anyway. All the handles are on the right of the toilet here at work (as you face it), and many cisterns are set up for either side (note the blanking plug on the unused side).
In my experience a pushbutton on the top is more common, these days.
The majority of people are right handed. Handle is on the right when you’re sitting. It seems like a convenient setup. I stand before flushing, but I’m still facing the same direction. Reaching behind me with my right hand.
I think this is the right answer, and what I was going to post, but Lemur866, you said it much better.
I think we are talking about toilets with tanks, like most have at home, and facing them when flushing. As opposed to the typical urinal in a men’s room, where you stand and face the receptacle while doing your business - in the latter, the handle (if there is one) is typically on the right side. Many of these are now automated so no handle at all.
Come to think of it, the toilets in a men’s room, and presumably women’s room, will also have the handle on the right (as you are facing the bowl). Maybe private toilets with tanks have the handle on the left, and public/office settings with industrial bowls/urinals/plumbing have them on the right? Maybe a plumber on the board can comment.
Left-handed (while seated) toilets do exist - the guy who custom built my home installed one. I really didn’t notice when I added to the house. I now have two toilets that are identical except for the handle location. A bit annoying, actually.