A-HA, my area of expertise!
(I"m a 10 year veteran sewer and drain cleaner!)
Ok diesel, when you say water is coming up through the concrete floor, do you mean literally? In other words is it weeping up through the concrete itself (cracks in the concrete?), or do you just have water/sewage standing on the floor and can't figure out where it's coming from?
If the first example is the case, then you've obviously got a broken/cracked/or dis-jointed pipe. Usually in a situation like this, I would video the line, pinpoint the problem area and dig 'er up
, but I can tell you it won't be cheap if this is the case. In my area(NC) video/location of a line would run you around $250-$400 alone, not counting the cost of repair
Now if the second example is the case (the floor is just flooded and you're sure it's dirty water), then the first places I would look would be the toilet flange and the shower. Water rises level and will come out at the lowest point first. The base of the toilet and the shower drain are the lowest connecting points in a typical plumbing system, UNLESS you have floor drains in your basement (such as an A/C condensation drain which can sometimes be connected to the sewer).
If your toilet has a mis-aligned or deteriorated wax seal (Wax donut ring which seals the toilet bowl's drain outlet to the flange of the drain pipe) and the sewer backs up, it will push/leak water out from underneath the toilet, flooding the floor. If that's the case, then all ya' got to do is go to Lowe's, get a $ .99 wax ring, a set of $3 toilet bolts, pull the toilet and put the new ring and bolts on. If that's not the case, then it may be bubbling up out of the shower drain and or floor drains (if you have those).
Now having said this, even if you fix a leaking seal, that doesn't solve the issue of the line stopping up. Sewer lines do not stop up for no reason, something is creating the blockage. Possible causes are feminine products/ flushing paper towels (neither of these break down like toilet paper and can easily get hung up in pipes).
Tree roots will also grow into a sewer pipe and create a blockage, but if the entire line is pvc then that's not likely...usually roots are only a problem with cast iron or terra-cotta drain lines.
Also if a line does not have sufficient downgrade(fall), debris can accumulate in low/flat spots and stop it up.
Has this only been a recent problem or is it a constant recurring problem?
How old is the house/plumbing?
Are you on a septic tank or do you have city sewer hookup?
(Sorry about all the questions, but the more you can describe your system/problem, the more I can narrow down the possible causes and solutions.
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