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4 Water Supply Sources 28 <br />Introduction 28 <br />Supplementing existing sources with additional approaches 28 <br />Water supply sources 31 <br />Limitations on sources 34 <br />Groundwater 34 <br />Estimated amount of water available to the metro area 38 <br />5 Key Water Supply Issues 39 <br />Introduction 39 <br />Water issues change across the region and through time 39 <br />Regulatory considerations 40 <br />Managing water demand 42 <br />Water use conflicts and well interference 43 <br />Aquifer water levels 43 <br />Groundwater -surface water relationships 48 <br />Water quality 50 <br />Uncertainty regarding aquifer productivity and extent 51 <br />Reliability of water sources 52 <br />Funding/finance 53 <br />Key factors contributing to uncertainty 55 <br />6 Moving Toward water Sustainability: Outcomes 59 <br />Introduction 59 <br />Sustainable water use 59 <br />Supporting Outcomes 60 <br />7 Taking Action 65 <br />Introduction 65 <br />Approach 65 <br />Funding 67 <br />Schedule of milestones 68 <br />Progress 68 <br />New strategies 69 <br />8 Roles and Responsibilities 80 <br />Introduction 80 <br />Summary of Roles 80 <br />Private Water Supply (Well) Owners 82 <br />Communities/Public Water Suppliers 83 <br />