On Nov 12, 1:39 pm, "Gizmofiddler" wrote:
I have the same problem - and it is NOT the drains. The smell comes from the
vanity sink the most, sometimes the bathroom sink, but never the kitchen
sink. The cold water seems to smell worse than the hot, but is really strong
until it runs for a minute, then goes away. Should I bleach the well or
what?
~Gizmofiddler

I know you're certain, but this is the classic symptom when bacteria
in the drain (usually in the trap) release the smell. It is in some
drains and not in others. It goes away when you run the water
(because there's only a limited amount produced at a time. Bacteria
are small.)

It's easy to test. Pour bleach in the drains. If that doesn't make
any difference it wasn't the drains.