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One idea would be to subscribe to the PlayerTickEvent and check that the player is in water but close to the surface, something like this: @SubscribeEvent public static void jump(PlayerTickEvent event) { PlayerEntity player = event.player; if (<CHECK IF PLAYER IS JUMPING> && player.isInWater() && player.level.getBlockState(new BlockPos(player.getX(), player.getY() + 0.5, player.getZ())) .getFluidState().isEmpty()) { player.setDeltaMovement(player.getDeltaMovement().add(0, 0.2, 0)); } } Unfortunately, the field LivingEntity.jumping is protected so you can not easily access it to check if the player is jumping. Probably best to use reflection to access it.