John Wesley Miller has built a new energy efficient home. It features a 520 gallon water harvesting tank on the side of the house. No pump is required to use the water out of the tank.

Mamta Popat / Arizona Daily Star

Those interested in learning how to harvest water can attend a workshop in Oro Valley.

The Water Harvesting Roundup in Oro Valley goes from 9:30 a.m. to 1 p.m. April 5 at Oro Valley Library, 1305 West Naranja Drive.

Experts will give talks about water harvesting methods and be available for one-on-one discussions. There will also be a self-guided tour of northwest side homes that use rain barrels and tanks. To receive a map or more information about the roundup, contact via email.

Contact reporter Phil Villarreal at or 573-4130.