Honestly , if you let the water run for a few seconds to get the hot water out of the hose , I believe the "health risks" would be much lower.
Since I grew up in the Rockies , and had natural environment yards , we only had hose drinking experiences at my Grandma' s and a great uncle's place maybe once a month. And you're 100% right about making sure the hose was off ! In our house an ass beating could come your way for not paying attention to the details .The 60's were a interesting time to grow up .
