What is this random dripping exterior pipe on my house?
An unidentified exterior pipe dripping against the foundation wall can indicate a plumbing leak or groundwater discharge, leaving homeowners unable to determine if the issue requires urgent repair or will cause structural damage. This uncertainty often leads to moisture spreading to interior areas like the vanity, making it difficult to assess the actual source or severity of the problem.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
- 1Pressure washing the area and adding an extension hose to direct water further from the house
- 2Checking p-traps and supply line connections
- 3cutting into drywall to inspect for moisture
- 4Removing the mystery pipe and installing a brass plug or hose bib instead
- 5checking the roof to see if a pipe cap blew off
- 6Asking online forums for identification
In their words
Unedited, most upvoted first, each linked to the thread it came from.
“Saw this while doing some yard work. Not sure how long it’s been like this for.”source ↗
“Any idea what the pipe is for?”source ↗
“How bad is the damage? Any suggestions on getting this fixed?”source ↗
“I’m really confused on what this is for as I’ve never seen anything like it.”source ↗
“Noticed some water on the bottom of the vanity and the right side moving upward was moist. Not sure where it could be coming from.”source ↗
“What is this long rusty extension on our outdoor tap?”source ↗
“Can’t figure out what this long rusty extension is for though.”source ↗
“help me identify what this is sticking out of the ground next to my house in SW Florida?”source ↗