Those look like drain lines. You should be able to test those by filling the tub. I'd look at the supply lines for the source.

If pipes are not leaking, most likely the water gets there from beneath the slab through the pipe opening which is just below the slab.

Do you think the basket needs sealing and will that fix the issue? Lennar said since the house is not yet graded, sometimes this can occur and that once the house is graded, they don’t think this will continue but they are not certain.

Yes, if the lot is not graded most likely some of the areas around the foundation have low spots or back-pitched. Once the grade is established you shouldn't have that issue...

That said if there is a high water table in the area and you get a lot of rain etc, the soil becomes saturated so the water table will rise and that creates hydrostatic pressure that will force water through any void in the slab and it will create seepage, so that basket will be the 1st one to fill up.

Besides sealing the basket, do you have any other suggestions? Would this lead to any long term water issues that I may be borrowing trouble by moving forward with closing? I’m so fearful of having future flooding or water issues in the house. There is a sump pump and it seems to be working but not sure why this water is sitting there.

Because the bottom of the box is sealed so the water cannot escape. You can fill the entire box with sand and put a thin layer of concrete on top of it to seal it all off.

Thanks again. Is something like this not too concerning (that it is can happen frequent enough with new homes not yet graded) or it may be a larger issue? Sorry for so many questions...I don’t have any house construction knowledge so trying to seek opinions to understand.

That's OK Mino, ask away with no worries!

Being this a new home you have a warranty, and after the final grading is done and settles and there are no underground water issues as I mentioned before i.e high water table, etc, it should be fine. Since the tub already connected you can ask them to fill that hole in with sand and top it off with concrete as I mentioned before. Put it on your walkthrough list to have that hole properly filled and sealed.

By the way, if there are radon issues in the area and you have a sealed sump-pump lid? If that's the case they should have sealed that opening regardless.

Good luck!

Thank you so much! Hearing that you don’t believe this is likely going to be a larger issue does bring me comfort.

Yes, the sump pump lid is sealed.

I will discuss with Lennar.

Here is a representation drawing of your sump pit and underslab tub box. You probably have ground water under the slab, which is perfectly fine. This water is drained via the exterior footing drain tile, but there is (probably) no pipes to drain on the interior side. So the water under the slab is entering the plastic tub box where the 2" sewer drain protrudes through the box. Either:

- the exterior footing drain tile elevation sits above the 2" sewer drain so the natural level of water at the tub box engulfs the 2" sewer drain protrusion, or

- the "interior" water has not (yet) come to equal the level of the "exterior" water because of soil type

First solution is sealing the tub box with a grommet, gasket, or sealant at the 2" drain.

If needed next solution is perforating the sump pit basin (assuming not done already) to allow the water on the interior to enter the pit and lower the underslab water level elevation. However, putting the holes too low in the sump basin may make your sump pump run excessively, so locate the perforations just under the tub box penetration height.

It could also be a remnant from the tub installation if its a master bedroom soaking tub. These are often installed at finish, connected up to the drain. Could easily flow a few pints of water out if jr. plumbing helper started the hard job while sr plumber worked on top.

Thank you for this! I will study the diagram. This isn’t a sign of any drain tile damage right? I assume I would see more water issues around the basement if this is a drain tile problem???

P.S. the exterior surface grading does not affect having underslab water. And filling the tub box with sand and concrete defeats the purpose of the box allowing the trap to be accessible. And water will just be trapped in the sand.

This isn’t a sign of any drain tile damage right? I assume I would see more water issues around the basement if this is a drain tile problem???

No and yes. You have a new build, problems with drain tile would be in 30 years.

@3onthetree The purpose of the box is only for drain adjustment purpose it's being put in place when you rough in the plumbing before the concrete basement is being poured. If you doing a bathroom in an existing basement and you have your walls up, you don't need that box.

Not to mention why do you need to access the trap? If it's clogged you snake it from the top.

When did the last time (if you in the trade or even a homeowner) you needed access to a trap unless you remodeling the bathroom? The box is useless, not to mention if you have radon remediation requirements that box needs to be sealed anyway and in most cases, it's filled with sand and topped with concrete to seal it.

One more thing, if you leave the box empty and not sealed and you have your tub enclosed and water will get in there, it will stink and you will have to get to it all the time to clean it and air out.

Yes the box is useless, I never see them used. The AHJs around here have no problem leaving gravel fill for rough-in future adjustment.

Ask for a warranty extension for this item?

Supposedly this is what has been done. I’m going to stop by this weekend to check and hopefully no more water coming through.

The plumbers sealed up the point where the 2 inch pipe goes into the radon basket that is below the tub trap. This should stop the water from seeping into the basket thru the under the floor drain rock.