The IVCSD supplies the communities of Greenville and Crescent Mills, California with fresh drinking water. The Greenville system includes Round Valley reservoir, a water treatment plant with a 720,000 gallon storage tank, and approximately 6 miles of delivery mains. Crescent Mills has its own system with a spring, treatment plant, and 231,000 gallon storage tank and distribution mains. All lots are metered with monthly billing based on usage.