Do you have an in-ground irrigation system? This looks like a water supply pipe (like for a sprinkler head) that was turned off upstream, but not quite all the way. It might be really hard to find out where, but you might get lucky and find it just needs a sprinkler head.

That looks like a metal pipe, not part of a sprinkler system. If the house previously had an oil-fired furnace, that could be an old fuel line that was cut. If so, it's possible that it is connected to an underground tank that has rusted through and water is coming into the tank and oozing out of that uncapped pipe. Does the flow rate vary based on the time of year and how wet the ground is?

Lastly, if you have an abandoned oil tank in the ground and it wasn't properly decommissioned, you could have an environmental problem...at least when you go to sell the house. I could be completely wrong about what this is, but it's a definite possibility.

The old irrigation system in my yard, circa 1955, is galvanized pipe. I don't think I could get anyone to install that nowadays.

The image looks just like when you turn off the system and try to change a broken head. It still blurbs a bit....

Sprinkler system, is best case scenario I think!

Fori-

Let's all hope you're right :-)

I'm probably not. :)

Same vein but absent a sprinkler system--coulda' been an old hydrant, too.

A shovel will tell you if the line is going thru the foundation and into the basement or crawl space where you can backtrack it.

If you can shut off water to your entire property for a bit, see if the burbling slows. Or taste it. It would be nice to know if it's clean water or something icky.

Taste it?!? That may be the worst advice I've read on the internet! :)

Abandoned sump pump connection? I've seen a few like that.

Abandoned sump pump connection?

If we were on The Family Feud, I’d say, “Good answer!”

Okay. Don't taste it.

"coulda' been an old hydrant, too"

Looks to be 3/4" of an inch or so, probably too small for any sort of hydrant...........

I presumed the reference to "hydrant" was to a yard hydrant, i.e., a freestanding spigot:

"Taste it?!? That may be the worst advice I've read on the internet! :)"

Very common, and useful practice.

In any event, could it be a condensate drain from your A/C?

I presumed the reference to "hydrant" was to a yard hydrant, i.e., a freestanding spigot:

Yes. 'Hydrant' is, I think, a regional term. Like how drinking fountains are called 'bubblers' in some areas.

Looks to be 3/4" of an inch or so, probably too small for any sort of hydrant...........

Probably limited to whatever the supply is/ was. Every house that I've ever lived in has had sill cocks that were supplied by nothing more than 3/4" pipe. I've seen a few (old) freestanding 'hydrants' that were 3/4". Consider that the house is old (1956)...built long before in-ground irrigation systems were common. Intended use then may have been mostly watering a few potted plants, hosing off a sidewalk, and refilling the dog's outdoor water bucket, etc.

Abandoned sump pump connection?

That's possible although dumb to dump the water next to the foundation. OTOH, given the ell, originally the drain may have involved more piping that has since been removed.

Would be nice if OP would check back in with more info or tell us if the mystery has been solved!!

We shut off our main water supply and the pipe continues with a steady drip. I am even more confused now with the amount of suggestions from all the helpful people who posted.

It is about 30 feet fromAC unit so I don’t think they are associated.

We are at a lost what to do next... call a Plummer , the city , or leave it as it’s a slow drip.....

Still very confused !!

Since it's not from your home water supply, you probably have groundwater seeping in through an open end or some breach in a connected underground tank. If you're still curious, you'll probably need to dig it up...

How long did you leave the water off? If it is connected to your household there still might be enough pressure to have it blurb a bit.

And do you have an irrigation system and have you used it yet?

Does it smell (not taste hehe) okay? You can tell it's not sewage, right? If you are in a subdivision, ask neighbors if they have any idea. It's also a good way to meet them if you haven't. (Older folks that have lived there a long time tend to be better at this sort of inquiry, in my experience.)

Do you live somewhere where it freezes? If not, it's probably not too deep to dig and see where it goes.

I don't think I'd want to leave it to drip. It's too close to the house.

"It is about 30 feet from AC unit so I don’t think they are associated."

Nothing to do with whether it is a condensate drain? If you have A/C you either have a gravity drain or a small pump to remove the condensation. Sometimes drain inside to sewer, sometimes just dump outside.

See if you can blow air from a compressor into the open pipe???

We have only used the ac one time this year, so that is why I don’t believe they are associated. The drip is constant

Where does the downspout connection lead to? Along the house or does it connect to storm drain?

What is that pipe that's near it? I mean the L-shaped one painted blue.

I believe it’s an old gas meter hook up. There is a brand new gas meter about a foot to the left of this

I too would recommend carefully digging around the pipe and follow it downward to see whether it turns into the house or somewhere else.