Water Stain on the Ceiling: Find the Source, Then Fix It

Safety first: If the ceiling is sagging, bulging or dripping, keep people and pets out from under it. Don't poke a sagging ceiling while standing beneath it, and turn off power to any light fixture in the wet area before touching it.

Is it still wet?

Press gently near the edge of the stain, not in the middle of a sagging spot.

Damp, soft or dripping: the leak is active. Go to what to do now.
Dry and firm: the leak may have stopped, or it only happens under certain conditions. Trace a light pencil line around the stain’s edge and check it after the next rain and after the bathroom above is used. If it grows, you’ll know which one it follows.

Find the source

Match what you’re seeing to the most likely cause. Then you know who to call.

Ceiling stain clues, likely sources and who to call
What you see	Likely source	Who to call
Appears or grows during or after rain	Roof leak, flashing around a chimney or vent, or a gutter backing up	Roofer
Below a bathroom, laundry room or kitchen; grows when fixtures are used	Supply line, drain, toilet seal or shower pan	Plumber
Grows with no rain and no fixture use	Water heater, a pipe, or an AC drain line above the ceiling	Plumber or HVAC tech
Near a ceiling vent or AC unit, worse in humid weather	Condensation or a clogged AC drain line	HVAC tech
Top-floor ceiling, many small spots, worst in cold weather	Condensation from poor attic ventilation	Roofer or insulation contractor

Why the stain is rarely under the hole: roof water often runs along rafters and decking before it drips.

If you can safely get into the attic, look with a flashlight for wet or darkened wood, damp insulation, and daylight around vents and the chimney. Don’t step between the joists: the ceiling below won’t hold you.

IBHS’s FORTIFIED program, which publishes roof guidance for homeowners, counts interior leaks and water-stained ceilings among the clearest signs a roof needs attention.

What to do now

Contain the water. Put a bucket under any drip and move furniture and electronics out of the way.
Relieve a bulge carefully. If water is pooling in a bulging spot, stand to the side and poke a small hole at the lowest point with a screwdriver to drain it into a bucket. Skip this if the ceiling is sagging badly: stay out of the room and call a pro.
Stop the source if you can. Shut off the water to the fixture or the house if it’s plumbing. For a roof leak, a roofer can tarp the roof.
Take photos of the stain, the attic and any damaged belongings before cleanup.
Start drying. Fans and a dehumidifier. The EPA says drying wet materials within 24 to 48 hours usually prevents mold.

Will insurance cover it?

It depends on the cause, not the stain.

Sudden and accidental leaks from inside the house, such as a burst supply line or an overflowing toilet, are usually covered, the Texas Department of Insurance explains.
A slow leak that went on for a long time is usually not covered, and neither is mold that grows because of it.
Roof leaks from storm damage fall under wind and hail coverage, if your policy includes it. Policies generally exclude wear and tear, so a leak from an old roof is a harder claim. Ask your insurer how your policy treats roof age.
Report the claim promptly, make temporary repairs to stop more damage, keep receipts, and don’t make permanent repairs until the adjuster has seen it.

Mold

Drywall that stayed wet can grow mold on its back side before you see it on the front. A musty smell is a warning sign. The EPA’s rule of thumb: you can usually clean up mold yourself if it covers less than about 10 square feet. If it’s larger, or the water damage was heavy, hire a professional with mold cleanup experience. Ceiling tiles and other absorbent materials that got moldy usually have to be replaced.

Fixing the stain

Only after the source is fixed and the drywall is fully dry:

Small, dry, firm stain: prime it with a stain-blocking primer, then repaint. Regular paint lets the stain bleed back through.
Soft, crumbling or sagging drywall: that section needs to be cut out and replaced.