When creepers are in a water stream they sometimes will break blocks with their explosions. This mainly happens when the water is anywhere on their body besides their feet.
How to replicate: place a creeper in a water stream one block thick (as pictured) and activate the creeper. More often than not, the creeper will damage blocks despite being in the water.
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Is this still an issue in the current Minecraft Snapshot 15w47c or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
Just tested again in the most recent 1.8.1 and yes, the bug is still in the game. I used the method described above to replicate.