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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. Begin by closing the water valve located behind the toilet. Once it’s off, run a full flush to remove all water from the system. Then, allow 15–20 minutes to pass and look closely at the ground where the toilet meets the floor. If you see traces of water or saturation, that’s a strong sign of a leak.

Next, review the flexible water line, which is the water conduit linking the wall valve to the toilet tank. Look for any visible cracks, rust, or mineral deposits, which often indicate a slow leak. You can also use a dry cloth to encase the fittings at both ends and give it 5 minutes to absorb moisture. If the towel gets wet, the leak is likely at one of those joints.

Another method is to listen closely. Even a small drip can create a delicate dripping or whistling tone after the tank has filled. If you hear an unexpected sound, it could be water escaping through a small fissure.

For a more precise test, 横浜市でのトイレつまり解消・水漏れ修理 restore flow and wait for the tank to fill completely. Then, turn the water off again and mark the water level inside the tank with a pencil. Wait a minimum of 3 hours and no flushes. If the the level falls below your mark, the leak may be in the tank, not the supply line. But if the water level doesn’t change and you still see wet spots near the base, the supply line is the culprit.

If you find a leak, install a new high-quality metal-reinforced connector, which is far longer-lasting than plastic. Always make sure the fittings are securely tightened, but avoid excessive force, as that can damage threaded joints.

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