No, you can't text to 911. A while ago they system was upgraded to handle wireless calls more effectively but it does NOT have the ability to handle text messages.
Another problem with using text msgs in emergencies: They can't pinpoint your location like they could when you call them. When you call an emergency number your GPS becomes activated and transmits it's location. Also they can pinpoint you to a general area using cell tower locations but it isn't as accurate. Text messages just don't contain the necessary information for it to happen.
If you disagree, text 911 and post what the responds is.
However, there are probably numbers for local services that have an automatic text system but I doubt they are used as emergency services today.