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 components that should never be put into water.
 

Electronic components

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

Assemblies and Mechanical components

Any pieces that are made of multiple smaller components 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 and never fully dry, resulting in mold or mildew growth.

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