Why is water still collecting in my sump pump after replacing the check valve?

Question

I’ve replaced one of two sump pumps and check valves in my basement. Water still fills the basin. Check valve is holding, it’s transparent so I can see so. Is this just accumulated water beneath the slab? Are sump basins typically perforated to allow this to occur? (Water is not coming from the drain tile that enters the basin) Thank for any advice! Will

Answer 1

The vast majority of sumps for drainage (as opposed to those for pumped sanitary sewer, which need to be well-sealed to keep the stinky stuff in) are permeable so that water can flow into them from the surrounding soil.

Most of the ones I've personally experienced are just an open-ended concrete or clay pipe with gravel or sand on the bottom, and usually a hunk of concrete or a few bricks to keep the pump out of the sand/gravel. I've seen a few of the "modern" plastic type, but not a majority of the ones I see.

Removing groundwater from below the floor is why you install a sump in the first place. Sounds like it's working as it should.