Introductory technical guidance for civil engineers, environmental engineers and other professional engineers and construction managers interested in wastewater treatment. Here is what is discussed: 1. INTRODUCTION, 2. PROCESS PERFORMANCE, 3. DETERMINATION OF PREAPPLICATION TREATMENT LEVEL, 4. DETERMINATION OF HYDRAULIC LOADING RATE, 5. LAND REQUIREMENTS, 6. INFILTRATION SYSTEM DESIGN, 7. DRAINAGE, 8. MONITORING AND MAINTENANCE REQUIREMENTS, 9. DESIGN AND CONSTRUCTION GUIDANCE, 10. REFERENCES.