Shower repair in Philomont.

A loose handle usually has a small screw behind a cap or plug. Snug it first. If the handle still turns on its own, the teeth that grip the cartridge have worn, and a new handle or cartridge is the fix. On a common brand, that’s a short visit.

Nobody here is on a town main. Loudoun County’s well records show close to 1,300 active household wells within three miles of Philomont, so the water in your shower came up through a pump and sat in a tank first. That tank is the first suspect when a shower won’t hold steady.

When the shower pulses, or drifts from hot to lukewarm in a rhythm, look at the pump before the valve. A tank that has lost its air makes the pump start and stop every few seconds, and you feel each one at the showerhead. Amtrol, which makes well tanks, says a bigger tank means the pump runs less and lasts longer.

Philomont sits in ZIP 20132, where nearly half the homes went up in 2000 or later and about a quarter before 1980. The newer ones have single-handle pressure-balancing valves, where a drip is the cartridge. The older farmhouses on the back roads are more likely to still have two handles with stems and washers.