Prescott: old houses, real winters, and granite under the garden

Yes, every winter. At roughly a mile high, freezing nights are an annual certainty rather than an oddity, so the low-desert advice about Arizona plumbing does not apply. Hose bibs with hoses left connected burst, pipe in unheated garages, crawl spaces and outbuildings freezes, and exposed runs on exterior walls are vulnerable. Basic autumn precautions prevent nearly all of it.

Three things. Disconnect every hose, because a connected hose traps water against the bib and is the most common cause of a burst outdoor connection. Insulate exposed pipe and anything running through unheated space. And confirm your main shutoff actually turns, so you can stop the water if something does let go. On a very cold night, letting a tap drip on the most exposed run helps.

Because freeze damage appears on the thaw rather than during the cold. A pipe splits while frozen but cannot leak until the ice clears and the system is under pressure again, which is why calls come the morning after a freeze or when a seasonal owner opens the main in spring. Open up slowly and watch the meter with everything closed before assuming all is well.

Usually internally corroded galvanized supply pipe. Decades of corrosion narrow the bore until flow is restricted at every fixture, and cartridges, aerators and new fixtures change nothing because the restriction is in the pipe. Rust-colored water after the house sits unused confirms it. Check static pressure at a hose bib first to rule out a regulator problem.

Because much of the ground is decomposed granite and rock rather than soil, and trenching through it is slow. That makes accurate leak or line location the single biggest lever on the price of a buried repair, a precise location turns a trench into a hole. For sewer work, trenchless lining or bursting is often cheaper overall despite a higher price per foot.

Materially, yes. In the low desert, closing a house is about isolation. Up here a property left unheated needs the system drained down, lines blown out where appropriate, the water heater dealt with and antifreeze in the traps. Merely closing a valve on a Prescott house that will sit unheated is not enough, and the difference shows up in spring.

Have it shut down properly rather than just turning the water off: supply isolated, system drained so nothing sits in exposed pipe, the water heater dealt with, and traps protected. It takes about an hour and removes most of the risk. Add a couple of leak sensors and someone who checks the house on a schedule, and mention the arrangements to whoever holds the key. See vacant home preparation.

At this elevation, yes. Hose bibs with hoses still attached, pipe in unheated crawl space or garage, lines to outbuildings and exposed well equipment are the usual casualties, and the damage generally appears on the thaw rather than during the freeze. Disconnect hoses, fit insulated covers, and know that your main shutoff turns before the first hard night of the season.

Because clearing a line and repairing a line are different things. If a drain blocks repeatedly, something about the pipe is collecting what passes it, scale, a bellied section holding water, an open joint admitting roots. A camera inspection tells you which, and where. Until that happens, each clearing is buying a few months at full price.

Look at the pipe where it enters the house or at the water heater. Dull silver threaded steel is galvanized and closes up internally over decades, producing weak flow everywhere at once. Grey plastic with crimped fittings is polybutylene, which fails at joints and is treated as a known risk by insurers. Copper and PEX are both normal and fine. The first two answers point towards repiping rather than repair.

Considerably. Most of the cost in small work is getting someone to the property, so four fixtures in one visit costs far less than four separate call-outs. Make the list before you call, photograph anything with a brand marking on it, and mention the oldest items first, in older housing the question of whether parts still exist is what decides repair against replacement.