This publication provides introductory technical guidance for civil engineers, construction managers and treatment plant operators interested in learning about domestic water treatment. Here is what is discussed: 1. OVERVIEW, 2. REFERENCES, 3. TREATING WATER AT THE SOURCE, 4. UNIT TREATMENT PROCESSES, 5. TASTE AND ODOR CONTROL, 6. CONTROLLING ORGANIC CHEMICALS, 7. TREATMENT PLANT INSTRUMENTATION AND CONTROL, 8. CHEMICALS AND CHEMICAL APPLICATION, 9. WATER TREATMENT PLANT RESIDUES, 10. DESALINATION, 11. WATER SAMPLING AND ANALYSIS, 12. APPLICABLE PUBLICATIONS.