The Coachella Valley in California is best known for its giant music festival. But there’s another Coachella, and it has nothing to do with partying. The valley is divided into two parts. On the west side, there are beautiful homes with large yards. On the east side, you find the mobile homes of the mostly Mexican American residents who work in landscaping or agriculture. The differences between the two sides are stark, but there is one difference that truly sets them apart and has serious health consequences: access to clean water.