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Ceiling · triage

Water stain on the ceiling: who to call

The short answer

A dry stain is an old or slow leak: find the source this week. A wet, growing, dripping or bulging stain is urgent, especially near a light fixture.

Bulging or near a lightIf the stain bulges, sags or water reaches a light fixture, switch off that room’s breaker, keep people out from under it and see the sagging-ceiling card.

Know your shutoffs

Main water shutoffWhere the water line enters the house: a basement or crawlspace wall, the garage, a utility closet, or near the water heater in warm climates.Electrical panel and main breakerThe breaker panel (or fuse box), often in a garage, basement, utility room or hallway.

Every outcome on this card

Emergency nowA bulging wet ceiling

Get people clear. Then stop the water.

  1. Keep everyone out from under it
  2. Switch off the breaker for lights in that ceiling
  3. Stop the water source if you can reach it safely Main water shutoff for plumbing; cooling off for an AC unit.
TodayAn active plumbing leak above

Stop using that bathroom; plumber today.

  1. Stop using the fixtures above
  2. Close that fixture’s shutoff, or the main if you can’t tell
  3. Switch off the breaker for any light near the wet spot
TodayA roof leak

Contain it today; roofer as soon as you can.

  1. Put a bucket under the drip
  2. If safe, look in the attic and catch the water Stay on joists; don’t step between them.
  3. Call a roofer and photograph the stain and attic Don’t go on the roof in rain or wind.
TodayAC condensate overflow

Turn cooling off; clear the drain.

  1. Turn cooling off at the thermostat
  2. Check the drain pan and line at the air handler
  3. Call an HVAC technician if it keeps overflowing
This weekA dry stain under a bathroom

Not an emergency. Find the source this week.

  1. Circle the stain in pencil and write today's date Growth past the line means an active leak.
  2. Run the shower or tub above for 10 minutes Then check the stain. Repeat with the toilet and sink.
  3. Look at the caulk and grout around the tub or shower Cracked grout is a common, cheap fix.

A dry stain is an old or slow leak. Slow leaks still rot wood and grow mold, so don't leave it for months.

This weekA dry stain under the roof

Check after the next rain.

  1. Circle and date the stain
  2. Check the attic after the next rain Look for wet decking, nail tips or insulation.
  3. Have a roofer look at flashing and vents Leaks often start at chimneys, vents and valleys.

Related

A sagging ceiling, cracking sounds, or a wall that movedRoof leaking during a stormAC leaking water inside

Written from

Original casaq guidance, updated 2026-10-05. General guidance, not a diagnosis; licensed-pro review pending. Severity levels: Emergency now / Today / This week / This month / Watch. Send a correction.

Step 1

Is it wet, dripping, bulging, or near a light fixture?