I had my municipal water tested (it comes from deep wells) and it is MAC-free. I guess I am a belt-or-suspenders person, so I rely on the 135F water heater and my test results. I don't soak, nor do I worry about soaking, sterilizing, etc.
Yes, MAC is in the soil, so I do take precautions in the garden, with masks or using help to handle digging, mulch, etc.
So fr this had=s served me well for 44 months and I have avoided becoming reinfected.
Sue