The SmartScape Program in the Tucson area offers classes that teach about low-water-use plants and correct use of irrigation controls to help conserve potable water.
General program information: http://www.tucsonaz.gov/water/smartscape and https://www.ag.arizona.edu/pima/smartscape/
Residential classes: http://www.ag.arizona.edu/pima/smartscape/smartscape-residential/
Professional classes: http://www.ag.arizona.edu/pima/smartscape/professionalworkshops/
The Town of Oro Valley's landscape zoning code requires that irrigation to certain vegetated areas (including buffer yards, landscape medians, and rights-of-way) be discontinued after five years: http://wrrc.arizona.edu/publications/water-harvesting/oro-valley-landscape-water-plan-code