I had no cold water coming out of our faucets, but the hot water was working well. After reading a couple of great reviews, I called WaterWorks and spoke with a very friendly woman who took me through their process and answered my questions. Michael arrived one hour later! He did a walk-through of the house and told me that the problem was that the pipes were frozen; he then gave me a quote for the costs, which I accepted and he went straight to work. At first it seemed like there might not be a way for him to fix it because we have plastic pipes upstairs (plastic pipes cannot be heated to melt the ice), but luckily our basement had copper pipes - and luckily that's where the freeze was. He had a machine that looked like a battery which ran electricity through the pipes in order to thaw them. There were a few challenges that came up, for example he had to remove our washroom door because the cables did not reach, but Michael was professional, very nice, and efficient. I would definitely call WaterWorks again!
They also have a discount right now where you get $10 off (up until March 30, 2011) if you give them socks or warm clothing that they will donate to a shelter. I had a bunch of old scarves, hats, sweaters and socks that I gave to Michael. I think this is a wonderful program, and should be done by everyone who uses WaterWorks and has anything to spare!