Adapting to Change: Utility Systems and Declining Flows explores the consequences of reduced indoor flows related to conservation on urban water supply systems in California. The report illustrates that demand management through water use efficiency can have many co-benefits including improved drought resilience, improved in-stream flows, reduced or deferred cost of infrastructure, and reduced energy costs; declining flows, however, can negatively impact water distribution, conveyance, wastewater treatment, and recycled water policy. Specific examples and details are presented within the report, including survey and interview data.