When a pipe bursts or a supply line fails, the single most useful thing you can do is shut off the water fast. Knowing where the valve is and how it works, before you ever need it, makes all the difference.

Where to find your main shut-off valve

In most Palo Alto homes, the main shut-off is located near where the water line enters the house — often in a garage, basement, crawl space access, or a utility area near the front of the home. Many homes also have a separate valve at the street, near the water meter, which is the city's point of access rather than yours.

Why it's worth checking now, not during an emergency

Shut-off valves that haven't been turned in years can seize up or be hard to budge, especially older gate-style valves. Finding this out during an active leak costs you valuable time. A quick test now means you'll actually be able to use it when it matters.

Do

  • Locate your main shut-off valve today, before you ever need it in an emergency
  • Turn it a quarter-turn and back periodically so it doesn't seize up
  • Show other household members where it is and how to use it
  • Know the difference between your main valve and individual fixture shut-offs

Don't

  • Don't wait until an active leak to find out your valve doesn't turn
  • Don't force a stuck valve aggressively — it can snap, making things worse
  • Don't forget that fixture-level shut-offs (under sinks, behind toilets) can solve smaller emergencies without cutting water to the whole house

Quick tip: If your main valve feels stuck or won't budge, don't force it during an active emergency — shut off the closest fixture valve instead and call a plumber to address the main valve separately.