Note to readers: This post was updated on July 14, 2026 with clearer, more specific guidance on spotting plumbing emergencies early and links to our detailed guides. We refreshed the details below so the advice reflects how we approach this work today.
Most plumbing emergencies don’t come out of nowhere. There’s almost always a warning sign in the days or weeks before — a drop in water pressure, a slow drain, a toilet that isn’t flushing right. Knowing what those signs mean can be the difference between a quick repair and a much bigger, much more expensive problem.
Dropping Water Pressure Usually Means a Leak
If water pressure in your home has noticeably dropped, a leaking pipe is one of the most common causes. Leaks aren’t always visible — they can be behind walls, under slabs, or underground — but they almost always show up on the water bill before they show up as a wet spot. If your bill has crept up with no obvious explanation, it’s worth having it checked. Our guide on finding hidden water leaks covers where to look first.
Slow Drains in Multiple Fixtures Point to the Sewer Line
One slow drain is usually a local clog. Slow drains in several fixtures at once — sinks, tubs, and showers all backing up around the same time — points further down the line, often to the main sewer. That’s a different repair than snaking a single drain, and it’s worth a proper look before it turns into a backup. See how to tell a clogged drain from a damaged sewer line.
A Toilet That Won’t Flush Right, or Runs Constantly
A toilet that overflows, flushes weakly, or backs up repeatedly can be an early sign of a sewer line issue, not just a toilet problem. A toilet that runs constantly is a smaller issue on its own, but it wastes a real amount of water every day it goes unfixed — see why it’s worth repairing a running toilet sooner rather than later.
When a Pipe Actually Bursts
A burst pipe is the one emergency that doesn’t give much warning. If it happens:
- Shut off the water at the main shutoff valve immediately
- Move valuables and electronics away from the water, especially anything on the floor
- Call a plumber right away — the longer standing water sits, the more it costs to clean up
- Expect a temporary cap or patch first, with a permanent repair (sometimes a full re-pipe of that section) scheduled after
Clogs That Stop the Whole House
If a large object or major blockage stops up the main line, every fixture in the house can be affected at once — no showers, no dishes, no working toilet. This is one of the few true all-stop plumbing emergencies, and it needs a plumber the same day, not the same week.
Western Rooter & Plumbing has served Pasadena and the surrounding San Gabriel Valley for decades and is available 24/7 for exactly these situations. If something on this list sounds familiar, it’s worth a call before it becomes a bigger repair.
