Date Published: Aug 28 2014 by J.T. Gonzales, Angie’s List contributor

LeakyFaucet_0814_4If left untreated, a water leak in your bathroom can cost you a lot of money, especially if it leads to serious water damage to walls, flooring and paint. But sometimes the signs of a bathroom plumbing leak aren’t always obvious. Look for these somewhat subtle signs to determine whether you need to hire a plumber to fix those leaking pipes or plumbing fixtures before things get worse.

1. Mildew or mold

No matter how well and how often you clean your bathroom, mold or mildew can spring up if you have a hidden water leak. Mold thrives on moist, dark areas, and a pipe, which is typically hidden in a wall or under flooring, provides the perfect starting point for mold or mildew if the pipe springs a leak.

While it’s normal for a little mildew to occur wherever water accumulates, such as in the corner of a shower, mold or mildew on non-shower walls or in corners of the bathroom is a clear sign that water is leaking somewhere and finding its way to those areas. A leaking pipe provides plenty of moisture, so the longer it takes you to detect and fix the leak, the easier and faster mold will grow.

2. Damaged paint or wallpaper

A wall with blistering paint or wallpaper is another sign of bathroom leaks. In most cases, steam from the occasional hot shower shouldn’t cause paint or wallpaper to come loose. When water and moisture get between the wall and paint, they eliminate the bond and begin to separate the two, causing the paint to rise from the wall and fall off in pieces. The same goes for wallpaper: The adhesive used to bond the paper to the wall becomes less sticky and the paper begins to come loose.

3. Damaged walls

A wall that is warped or stained for no reason is a clear sign that you have a plumbing leak in your bathroom. When drywall is exposed to moisture, it becomes soft and begins to bubble, ultimately warping and breaking into pieces. If the leak reaches the ceiling, it causes it to sag and possibly leak some of the water that has accumulated. To fix the leak, a plumber often must tear out the drywall, requiring someone to patch and paint when the plumber is finished.

4. Damaged flooring

Unless you purposely let water sit on it, a bathroom floor rarely suffers water damage unless there is a leak. If your bathroom floor is buckling, cracking or beginning to stain for no obvious reason, chances are hidden water is the culprit. The water could be from a pipe directly underneath the floor, or it could have traveled there from another area.

Depending on the type of flooring in your bathroom, moisture can make it feel spongy or soft. Tile may lose its adhesion and become loose, allowing you to easily remove a piece and possibly expose water or moisture underneath it. You will also often find a damp subfloor.

5. Stains on ceilings

If you have a bathroom on a second floor, check the ceiling in the room directly beneath the bathroom for stains and signs of water damage. However, because water can travel a long distance, it’s possible to find stains farther away.

Occasionally having a wet second-story bathroom floor won’t cause enough seepage to damage anything underneath. Any brown, copper or dark stains on the ceiling is a sign of a pernicious water leak. A sagging ceiling is a sign that water from a leak is reaching the area.

6. Smell

Old, accumulated water from a leaky pipe tends to smell. If, after thoroughly cleaning your restroom, you still notice a musty or earthy smell, it’s likely that you have hidden leaks. Because the water is hidden, it never has a chance to dry.

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