Before you call, find your main shutoff and close it. In most houses around here it is in the basement on the street-facing wall, near where the water line enters. Shutting it off stops the damage clock while you wait.
Then call. Describe what you see and where the water is coming from — that determines what comes off the truck. One exception: if you smell gas, do not call a plumber first — leave the house and call your gas company from outside.
Describe what you are seeing. Most problems get narrowed down over the phone before anyone drives anywhere.
You hear what failed, what it takes to fix, and what it costs — before the work starts, not after.
The repair gets done and you get told why it happened, so you know whether to expect it again.
★★★★★“Elliot came by after a previous plumbing company could not clear a clogged sewer line and recommended jetting it and then potentially replacing it. He was able to cut through some tree roots without any issue.”