Plumbing in Hawaii does not freeze, and a winterizing talk will waste the call. What fails is rust, a leak under a slab, a drain asked to serve an ohana, and windward rain pushed at a low opening. There is no basement to hold the mess. Water shows on the floor, in a single-wall board, or on a ceiling. Shut the main if it is loose. Know that valve before you need the sentence.
Lava rock and coral soil turn a new line or a repaired drain into digging, not a light afternoon. Say if the layout has to move. A cable clears a clog and does not fix a bad tie-in from an addition that was never vented properly. Older single-wall houses often show their pipes. Newer framed houses hide them until the stain travels. Tell which house it is. The visit should start at the right access.
Water heaters sit in humid closets and rust at the base, the fittings, and the pan if a pan exists. Name gas or electric and the shutoff, and say whether an ohana shares the tank. Salt seizes exposed valves until a small repair needs a full shutoff. If you smell trouble at a gas vent, stop using it. A seized outdoor bib is corrosion, not a freeze, and it still needs a hand.
Windward showers drive water at doors and at a slab that cannot drain if the grade points the wrong way. That site water imitates a pipe. If the meter is still with the fixtures off, look at the roof and the grade. If the meter is moving, find the supply. A warm slab for weeks is a different urgency. Say how long the floor has felt that way.
Say leak, drain, water heater, or a seized valve, and the town. Say windward or leeward if rain is part of it. Say if the main is already off. Nothing is going to thaw and reveal the break, because it was never frozen. Call the number on this page.