Are LEGO® bricks waterproof?

Do you want to play with your LEGO® bricks in water? No problem! Standard LEGO® bricks are not harmed by water. Some specially designed one-piece boat hulls will even float on the surface of water, although most LEGO® creations will not.

On the other hand, we don’t recommend you use your LEGO® bricks as decorations in aquariums or fish tanks. Additionally, there are also a few types of LEGO® parts that should never be put into water:

Electronic parts

Please be careful to make sure electronic parts like motors, sensors, lights, and battery boxes don’t come into contact with water. Putting electronic parts in water can damage the parts and pose a safety risk.

Assemblies and Mechanical components

Any parts that are made of multiple smaller pieces which can’t come apart, like a Technic gearbox or DUPLO® vehicle should not be put into water. There’s no safety risk from immersing these, but water could get inside the part and never fully dry, resulting in mould or mildew growth.

For information on how to clean your LEGO® bricks, check out this help topic.