Plumbing in Tucson is hard water, cooler lines, and the occasional foothill freeze, with slabs and old galvanized still hiding in central houses. The heater scales, the shower valve stiffens, and a tank in a hot garage gives up. Evaporative coolers add a supply line and a drain at the roof that leak into ceilings and get blamed on the tile. Galvanized pipe in older bungalows pinholes in the walls. A slab leak shows up as a warm floor or a bill you did not expect from the meter. Say which symptom you have, and skip the guess that it must be the monsoon.
Shut the main if the leak is supply, and say whether that valve even works. A hose bib on the north side of a foothill house can split on a cold night that downtown never felt. That is a real Tucson plumbing fact and a poor Phoenix one. Drain problems need their own sentence. One slow tub is a trap or a branch. Several fixtures together are a larger line, and desert trees will find an old sewer. Ask whether the work is a cable, a camera, or an actual repair of broken pipe. A cable does not fix a collapse.
On a heater replacement, say gas or electric if you know it. Ask for a shutoff, a pan where the location needs one, a discharge line, and haul-away. Ask whether scale was the failure. Wells and septic still exist on the edges. If that is your lot, say so before anyone treats the house like a city connection. Adobe walls mean a leak can travel a long way before it shows, so say where the water first appeared, not only where it is dripping now.
Cooler plumbing and domestic plumbing should be named separately so the visit brings the right repair. If the ceiling is wet only while the cooler runs, say that in the first breath. Call the number on this page.