I found out my town will install an irrigation water meter for a very modest charge, cutting the cost of watering the lawn by about 2/3. $200 for the meter, no sewer or reclamation fees, and there's even no minimum monthly charge. Three weeks without a drop of rain--so I guess my next project is going to be a sprinkler system.
DIY is kind of complicated. I think I have a basic grasp of how to do it, though. http://www.irrigationtutorials.com/
A lot of people around here don't bother because it's basically subtropical, but my lot has too many trees and kind of crummy soil. Grass just won't grow without constant attention. The only thing I don't want to do is tear up my lawn. I just got it looking nice and mostly repaired from last year's big drought.