Using harvested rainwater can reduce the amount of treated water pulled from the community’s water supply. Consider all the ways you use water outside: washing your bike or car, watering potted plants, irrigating a landscaped bed, or any number of other activities. The water you use for these does not need to be potable, or, treated to the standard of drinking water. Captured rainwater will do the job just as well. In addition, rainwater captured in a barrel can still be used outdoors even when we’re under drought restrictions.