Water Dead Ends (sickness)?

I have a question about a water dead end as it relates to water quality and the potential to create health issues.

Off of the cold water 1" supply that has numerous branches for bathrooms and sinks and so, I added a T with a ball valve for a new DEAD END CIRCUT for a fire sprinkler in my garage (PVC).

No water flows (I hope) in this T circut.

I have city water, any chance the water could get contaminated (stale) in someway and get us sick?

I have a low point on the sprinker (for a drain) I was thinking about putting
a ball valve and draining the water every six months or so.

Any thoughts on this?

Inspectors do not like dead ends. The codes will have at least some vague language not to do it. Now, it is a coin toss which will make you sicker, a dead-end pipe or a cookie with milk products from China!

I think a "bleeder" pipe with a valve as you describe should be fine, but better safe than sorry with some CEOs. Talk to him and ask his opinion before you put the line in.

Could freezing be a problem in this garage?
Here it would be!

it may be wise to install a backflow preventer after your ballvalve. This way if any contaminents are there, it will not affect your potable water