New to the forum, I hope I posted this in the correct location. We have lived at our home for 7 years and I need to move for work. The buyer requested a static water test, we agreed. The plumber came out and blocked the line on the street side and began filling the line. The water reaches a certain level and would not fill any higher, nor would it drain lower after removing the hose. He said it looks like you have a leak, and it must be fairly big since the water was evacuating as fast as it was filling. I am wondering if the water is not fully blocked off. The previous owner added a second 3” drain line that starts on the opposite corner of the house and runs around the house to tie into the street just past the line the plumber blocked off. I am wondering if this new line is connected into the old system too, and this is why the water only reaches a certain level. We have seen no settling issues or swampy soil with our slab home. I’m wondering what the forum thinks it is.. this is the first slab home I’ve ever had, I had never heard of drain line leaks like this before this test.