Hopefully I am about to ask the world's most stupid question and I will get an answer right away.
I don't know if this pipe is pool related, house related, or some kind of septic thing. I just closed on the house a couple of months ago. Standard 3 br 2 bath slab foundation (rare to find a basement in Texas). I was starting to dig out a back bed along the house when I ran across what I thought was one of 12 million rocks strewn all over the place by a previous owner. I went to pick it up and realized it was a 2" pvc line cap. I dug out about a foot down but still have no idea what it is or where it is going. There is sand around it, which leads me to believe it was put there by someone who had a good idea what they were doing. The pipe is about 5 inches from the slab of the house. It is on the outside of the master bedroom, probably 10 feet from the nearest indoor plumbing fixture (which is located on the same outside wall, just 10' down the wall). On the outside of the house the next closest plumbing things are about 12" away. That would be a water faucet (run in the wall and exiting through the brick of the house). Also about 12" away is the pool equipment (20 year old pool). Just slightly further down at roughly 16" is the septic tank pump out and lid. The pipe has a cap on it that reads for a pressurized plumbing set up, but I haven't got enough of the pipe exposed to see if it shows for pressure. The cap doesn't seem to be a threaded cap like I have seen on clean outs. Looks like it was intended to stay on there.
There are no pipes coming off of the pool equipment above ground and then heading underground besides the normal "from pool & to pool" lines which head in a different direction. There is an old polaris setup on the far side of the pump, but it was cut apart years ago and just part of the piping wasn't removed. I feel sure that it isn't part of that.
So, here are some pictures. Please remember I haven't been in the house long and I am working on the "ugly". Also, when I laid sod a couple of weeks ago, I didn't unstack (I thought it was cool enough) and my 2nd pallet got burned in the center. I put it down anyway. It is coming back, but those burned pieces are ugly right now... so yep, there is that. I put a red shovel right at the pipe so you can see where it is a bit easier in the distance shots .
So you can see the distance to the pool.
From the pool equipment area back towards the mystery pipe.
I know you are thinking "don't worry about it, just cover it back up and go on with your planting", but I am planning an outdoor kitchen and if I suddenly find out that I have septic tie ins run out there, it would make my life easier. Plus, I just don't like things that I don't understand.
Thanks for any ideas that you might have! Like I said, it is probably something that I should have recognized at first glance.