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If you suspect a hidden leak in your toilet’s supply line, it’s important to act quickly before water damage becomes serious. First, locate and turn the shut-off valve at the base of the toilet. Once it’s off, empty the tank and bowl by flushing once. Then, let the area sit undisturbed for 15–25 minutes and check the floor around the base of the toilet. If you see dampness or pooling water, that’s a strong sign of a leak.

Next, inspect the supply line itself, which is the flexible tube connecting the wall to the bottom of the tank. Look for 横浜市でのトイレつまり解消・水漏れ修理 any fissures, corrosion, or white residue, which often indicate a slow leak. You can also use a dry cloth to encase the fittings at both ends and let it sit for a short time. If the towel turns soggy, the leak is likely at one of those joints.

Another method is to listen closely. Even a small drip can create a quiet bubbling or dripping echo after the tank has filled. If you hear a suspicious tone, it could be water escaping through a microscopic crack.

For a more precise test, turn the water back on and let the tank refill. Then, close the supply and use a pencil to note the water height. Wait a few hours without flushing. If the water level drops, the leak may be in the tank, not the supply line. But if the the level remains stable and you still see traces of water on the tiles, the supply line is the culprit.

If you find a leak, upgrade to a corrosion-resistant stainless steel water line, which is more durable than rubber. Always make sure the fittings are securely tightened, but don’t overtighten, as that can cause costly breaks.

If you’re unsure or the leak persists, it’s best to call a plumber to avoid further damage. Catching a hidden leak early can save you from costly repairs and mold problems down the line.