They will get hurt in water but thay won't fly away from them.
Environment
Put your operating system (Windows 7, Windows XP, OSX) and Java version if you know it here
Linked issues
Comments 2
Duplicate of MC-48907.
MC-69898
Blaze won't fly away from water.
Resolved
Duplicate
0
Confirmed for 1.8 (in fact they sink in water and lava).