For certain areas that are more arid, like the American southwest, there is a limited amount of water that is available. The main source of water is the Colorado River, which no longer flows all the way to the Gulf of California because it is diverted for agricultural and domestic use. Looking at google earth, you can see the large amount that is diverted to California before it crosses to Mexico and also the agricultural lands in Mexico that use the remainder. If the sewer treatment system for your area discharges somewhere like the Ocean, then that water will not be reused and will be wasted. If it discharges to a stream with a downstream user, then it can be reused. For lawn irrigation, there will be a lot of water that will evaporate and leave the system that will be wasted.
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