Sample water for lead
In the 30's they still used lead quite a bit, lead solder was used into the 70's for copper pipe. In my early years I had removed lead pipes and drains most of these homes were a bit earlier Victorians but there have been a few cabins that we remodeled that were from the late 20's early 30's and most was on a 2nd or 3rd remodel and mostly the drains were lead but we did find a few lead pipes on drinking water pipes in angels camp California. Running the water for a few seconds similar to normal ussage is a good idea to get a idea what is in the water because even copper pipe from the early 70's may have lead solder joints, if the water is run for a short time the lead levels will be much lower.