I've got a 5 yr old two story house, with a bath on both 1st and 2nd floors.

When I came home after work, I found the clean water that was in the toilet bowls when I left in the morning was now sprayed all over the bathroom floor.

How did this happen?

I'm guessing that some unusually strong, quick change in air pressure forced a "bubble" of high pressure air down the vent stack and the house being at a lower pressure, voilà, out the drains it came. It probably came out the sinks too but due to the low volume of water in the S-trap, did not leave a "footprint".

Is this plausible? Have you ever heard of this happening before?

Both bathrooms? I have never really heard of such a thing... some bubbling for sure... but water everywhere..? Were the toilet bowls completely emptied.. Mostly empty..? Let us know, please.

Yes, both bathrooms and both bowls were mostly emptied, just a little water remained in the bottom.

I don't know if the neighbors had the same thing happen. I can check.

Check on the neighbors. Then call you local plumbing inspector and present this scenario to him... Part of me wants to tell you to GET OUT OF THE HOUSE... ;)... SOUNDS HAUNTED TO ME!!

HEY CHECK THINGS OUT... GET BACK TO US.. ok?

Mystery solved!

I went to the township utility dept and the guy there said they were using a high pressure hose to clean out the sewer line. What likely happened (to me and four others who also called them) was the hose has a special end that sprays the water backward so the high water pressure pulls the end down the pipe. Then they use a machine to reel it back in with the high pressure water still flowing and this cuts the buildup in the pipe. However, in doing that, a vacuum is created downstream of the hose nozzle, and other odd air pressure things happen (sorry, I didn't get the whole tech thing). Typically, the higher air pressure vents out home stacks but if a stack is blocked (leaves, ice), probably ice in our case, then the air pressure takes the path of least resistance.

My wife thought we had a ghost too. :)

Case closed.

Is the city willing to pay any damages..? Are there any damages..? Glad to hear problem solved!

If I helped, please rate the answer below... good luck!

There were no damages. Thanks!

You know... I got to wonder... *kinda laughing 'bout this*... What if you or wife had been on the toilet when this happened... or a little one... Oh my God!!

Anyway.. thanks for rating answer... glad all is well. I did have to re-post when all of a sudden I pictured a huge blast of water... me sitting on the toilet... very funny!! I am just glad no one was home ;). Good night!