My bathroom floods copiously when ever it rains. Water comes in from where the toilet joins the concrete slab floor. We removed the toilet and there is the hole connecting the toilet to the pipe for the septic tank and very wet mud around it. Water seems to just be trapped under the house as it rains and rises out though the hole in the slab and out though the joint. What is proper way to correct this? Thank you! I like in Miami and tropical storms are a constant threat of flooding!

posted question previously. But now I know more. There is no concrete around my toilets flange. Picture this: Concrete slab floor, jagged hole with soil and mud visible, tube going to septic tank in the middle of that hole, but there is space, about up to 3" at some places between the concrete slab and the tube. I'm positive that the water is coming in (three inches of water in the bathroom when it rains) through the space between the slab and the tube. How do I fix that? Is it expensive? In Miami and tropical storms = flooded bathroom, living room and bedroom because of this. Heeeeeeelp.

I assume that septic isn't backing up or you'd say you smell it. Filling in around the toilet with a bag of redi-set concrete isn't going to solve your problems but you can start there. Water around and under the house has to be drained in various ways, usually by perforated 4" pipe (flexible or solid PVC) underground and on top of gravel (or better, surrounded by gravel wrapped in filter cloth) running around the bottom of the edge of the slab, and then sloping away from the house and out into the lawn, all underground until it's several feet away and then preferably out at ground level. Those are called curtain drains. You can install a pump if that's not enough. You can install French or trench drains further away from the house, down about 2 feet, similar to curtain drains with gravel and filter cloth around perf pipe, that have a way to drain outward and down away from the house. But if your area is totally flat and just plain saturated all the time all around and under the slab, you'll just have to have a pump installed. Start getting some quotes. Don't expect the same advice from every contractor. Find a GOOD one who really knows drainage or it will all be for nothing.