Introductory technical guidance for civil, mechanical and environmental engineers interested in utilization of Graywater in order to conserve water resources. Here is what is discussed:1. INTRODUCTION2. BACKGROUND3. USE OF GRAYWATER4. POLICY AND REGULATIONS5. QUALITY OF GRAYWATER AND HEALTH CONSIDERATIONS6. TREATMENT OF GRAYWATER7. STORAGE OF GRAYWATER8. TYPES OF GRAYWATER SYSTEMS9. GRAYWATER APPLICATIONS10. FUTURE AND INTERNATIONAL APPLICATIONS11. SUMMARY.