Pipe dead ends in remodel

[LittleFish23]

plumber came and cut our old washer dryer pipes, but was only able to remove a few feet before then went under the subfloor. He said there is a small risk of bacteria in these ends if water is stagnant but didn’t seem to offer any other thoughts or solutions. Is this worth trying to take up subfloor and cut the lines further/see where the T is? We are on well water. We thought about adding a filter/separate drinking water faucet to the cold water pipe as a potential solution as we will have a sink very near to these pipes, but that still leaves the hot water pipe cut as is. Any ideas for solutions?

 

[Twowaxhack]

You’d have to find where those pipes originate to cap them off at the beginning of the run.

 

[MicEd69]

As you are on well water, your chance of bacteria in these dead ends is more than on if you were on treated public water lines. As your subfloor is wood, do you not have an accessible crawl space?

It would be best to remove the dead ended lines. But as you have a sink nearby, a Rube Goldberg approach could be to connect both the washing machine lines to both of the sink lines. that would provide some flow through all the piping when the sink is used. Funny plumbing, but it would work.