Did you ever wonder why it is recommended to water your yard in the evening? It is simple. When you water the lawn during the warm or hot day, some of that water evaporates without ever reaching the roots of your grass, flowers or plants.
A simple way to reduce useage. So if you have been watering the lawn during the day and have had good results, cut the amout of time you water when you switch to the evening. You will save water and money. Most importantly, that will be less water the water department will have to clean and less energy and chemicals they will have to use.
The cost of clean water is more than just the bill you get. Actual energy and chemicals are used.