Traditional Roots Reggae is definitely still being made, its around you just gotta look for it. Burning Spear is still making music (of you're unaware of whom he is then I highly suggest picking up some of his material he is brilliant.)
There is also a lot of great newer acts who take classic roots reggae styles and add their own flavor to them. Guys like Stick Figure, Fear Nuttin' Band, Rebelution, The Dirty Heads, SOJA, Clear Conscience; among many others.
Your best bet would to check out a few of the bands I mentioned above, or like Mr.Charlie said check out some of the older threads in this sub forum.
A great place to get a lot of info for up and coming reggae acts would be The Pier. They follow and support a lot of these underground acts and showcase them for the world to see, one of my favorite websites.
The Pier Magazine