Yes, but not everywhere.
Below is an image of what the water fountains look like at the airport at the time of writing (07/2015):
CDG water fountain, JoErNanO, Attribution-ShareAlike 3.0
Apparently, the fountains are used in other airports - but I found another mention of it in this video, which also attributes it to CDG. It is a side view, but it matches up.
I also found this blog post, which says
The fountain (I’ll try to post pictures) was a tall, orange thing with two buttons on each side, like a pinball machine, and instead of a spout, a metal disc with no clear hole. I saw some savvy French woman get a sip, but when I tried I had no luck. I pushed the left button. A blue light turned on, but no water. I pushed the right button. No change. I put my phone down and pushed both buttons. A different blue light went on. I was totally confused, and still thirsty.
Where Are the Fountains
Recent, hands-on experience with the airport show that drinking water can be found in the following locations:
- Terminal 2D: there is a fountain in the Schengen zone (after security) next to the toilets between gate D54 and D55
- Terminal 2D: there is a fountain in the check-in area (before security) next to the male toilets between desks 9 and 8
- Terminal 2E: there is a fountain between gates L25 and L26 (as of 19 Jan 2019).
- Terminal 2F: there is a fountain after security in front of gates F29/F30
out of order as of 22/07/16. Working again as of April 2017.
- Terminal 2F, arrivals floor: inside the entrance to the toilets, near Marks & Spenser Food
- Terminal 2G: near the toilets
(Please edit if you have information about other areas)