When a pipe bursts, the water keeps running until someone shuts it off. If that's happening right now, call (619) 627-0200 and we'll send someone out. If nothing has burst yet, the rest of this covers how older El Cajon lines usually fail.
If an El Cajon house still carries its original galvanized supply lines, they can fail from the inside, rusting and narrowing out of sight, and where the soil is clay, ground that swells and shrinks can flex the lines too. The warning signs can include weak pressure, rusty water, weeping fittings, or visible leaks. Catching any of them early is a chance to address it before the damage gets worse.
Whatever stage you're at, the contractor can find the failure, work out the cause, and fix what's actually wrong, whether that's one section or a talk about the whole system. In houses with older lines, that talk is sometimes about a repipe, and you'll get the reasons and make the call.