I have heard many people say (including all of our local pet shops) that you can't grow plants in Davis water, and you have to use bottled water. This is simply false. Look at their plant tank displays and you will see that they don't know the first thing about growing aquatic plants (at least at the time of writing).
Davis water is hard and has a high pH, but almost all plants will thrive in it given good conditions. You should change some of the tank water each week to replenish the trace elements, unless you add them separately. Some plants react extremely unfavorably to long periods with no change followed by a large percent change, but most are quite forgiving. Our local water has the following analysis:
