#1.....I remember you posting about a water quality project......Treatment/softener?.........
SO the question is...........CAN you SEE, SMELL or TASTE any "problem" with the water supply ?
#2.....Does the washer discharge the waste "normally".......YaKnow......does all of the water drain from the machine......Is it Sloooow to drain........Is there an air space/break between the discharge hose and the sump.....?
Maybe the pump is blocked (coin....GIJoe.....) holding water that turns rancid