Speedy Jim wrote:
Laurie wrote:

Mystery of the day. I was sitting at my desk at home when all of a
sudden I heard the toilet flush - but I was the only one home.
Checked the toilet - no water. Checked the tub - evidence of backup
already subsided. Flushed the commode. Flushed fine, filled fine.
Went to back bathroom - same thing. Flushed that commode - all's
well. There was a strong sewer gas smell in the back of the house. Also
noticed water on front porch that appeared to emanate from
drain cleanouts. Called city water department - nothing going on in this
area. Two
days ago we had a day of very heavy rains. I was also doing a load
of laundry, but am pretty sure it was already done when this
happened. Can anyone tell me what has happened? Should I be concerned
(other
than to disinfect said tubs?)? Should I take any action (like call a
plumber?). TIA, Laurie


Total guesswork without seeing the actual layout.

My guess: The storm runoff flooded the city sewer system,
causing it to backup into your (and others) sewer lateral
connection.

Either the sewer venting on your house is not working or
(more likely) the flooding rose to a level high enough
so as to block off the vent. As the water rapidly receded,
the force sucked all the water out of the toilet traps
(because the vent was unable to prevent the suction).

Ask around the neighborhood at similar homes at the
same elevation to see if anyone else experienced it.

It's probably a municipal issue and not something
a plumber will be able to do much about.

Jim

Thanks Jim. Sounds reasonable to me...I don't understand the whole venting
thing, which is fine, it just seems reasonable. I could ask a few neighbors,
but while we all know each other it's not the world's most social
group...plus it happened mid day while everyone else is at work...

I'll go with the flow, so to speak ;-), and just see if it happens again. In
the meantime, I'll go learn about sewer vents!

Thanks - Laurie