You can look up the water need of individual plant species in our area at:http://ucanr.edu/sites/WUCOLS/Plant_Search/. Select "North Coast Central Coastal" region, scroll down to Los Altos Hills, and Click "Submit"." From there you can search plants by type, botanicalname, or common name.
Continue Limiting Irrigation to No More Than Two Days Per Week
Even lawns need a few days off to dry out between watering. Trees and shrubs, with deeper roots, prefer many more days off than that between watering.
If You Have to Replace Your Lawn or Any Landscaping, Consider Non-Turf Alternatives and Local Native Plants
View a list of trees, shrubs, and grasses native to our area prepared by the Environmental Design and Protection Committee (PDF). These plants do well here and they like they "belong."
Consider Upgrading Your Irrigation System
Old-fashioned overhead spray irrigation loses water to overspray, evaporation and wind, and applies water at far too great a rate for our clay soil to absorb before runoff. Consider low-precipitation rate alternatives such as drip or subsurface irrigation.
Also, modern irrigation controllers can accommodate long intervals between watering days, long run times for drip irrigation, different "programs" for lawn and trees and shrubs, and automatically adjust for seasonal weather changes.
See the Santa Clara County Water District’s website for free home/landscape water audits, and landscape equipment rebate programs.