* Rainwater provides a water source when groundwater is unacceptable or unavailable, or it can augment limited groundwater supplies.

* Rainwater is sodium-free, important for persons on low-sodium diets.

* Rainwater is superior for landscape irrigation.

* Rainwater harvesting reduces flow to storm water drains and also reduces non-point source pollution.

* Rainwater harvesting helps utilities reduce the summer demand peak and delay  expansion of existing water treatment plants.

* Rainwater harvesting reduces consumers’ utility bills.

* The water is free; the only cost is for collection and use. Stored rainwater also is a good standby in times of emergencies such as power outages or during periods of extreme drought when wells dry up.

* The end use of harvested water is located close to the source, eliminating the need for complex and costly distribution systems.