Yes, tap water in Las Vegas is considered safe to drink. It meets or exceeds all federal and state health standards, as stated by the Las Vegas Valley Water District. Some standards that are required to be met include maximum lead content, disinfectant levels, and microbial contaminants. The Las Vegas Valley Water District tests for over 150 different compounds each year and 80 common organic chemicals each month. Plus, 60% of the water is delivered directly from the Colorado River, creating some of the most pristine water in the country. But to really understand what's going on with your tap water, it's important to assess each of the indicators that make up the overall quality of your water.