Get rid of ornamental grass. Recycle more wastewater. Make indoor and outdoor watering more efficient. Limit outdoor watering to a few days a week. Create water rate structures that encourage conservation. Minimize business use of thirsty swamp cooling. Crack down on water leaks. A group of 30 cities and water districts, including Tucson, committed to carrying out these water conservation measures in an agreement signed last week. The measures, described by the agency officials as unprecedented, are aimed at reducing water demand by cities across the West to make the region less reliant on dwindling Colorado River supplies.