| Chapter 21-1. WATER SUPPLY |
| Chapter 21-2. PUBLIC SEWER SYSTEM |
| Chapter 21-3. WATER METERS |
| Chapter 21-4. CONTESTED WATER AND SEWER BILLS |
| Chapter 21-5. WATER QUALITY AND POLLUTION |
| Chapter 21-6. RIPARIAN RIGHTS AND WATER PRIVILEGES |
| Chapter 21-7. SOLID WASTE CONTROL |
| Chapter 21-8. SOLID WASTE CONTAINER SPECIFICATIONS |
| Chapter 21-9. DISPOSAL OF CERTAIN BODY WASTES |
| Chapter 21-10. RETAIL ESTABLISHMENT CARRYOUT BAGS |
| Chapter 21-11. WATER QUALITY STANDARDS |
| Chapter 21-13. WATER QUALITY RESEARCH GRANT REGULATIONS |
| Chapter 21-14. SUBMERGED AQUATIC VEGETATION REGULATIONS |
| Chapter 21-15. DISCHARGES TO WASTEWATER SYSTEM |
| Chapter 21-17. BIOSOLIDS MANAGEMENT |
| Chapter 21-18. WELL CONSTRUCTION, MAINTENANCE, AND ABANDONMENT STANDARDS |
| Chapter 21-19. WATER QUALITY MONITORING REGULATIONS |
| Chapter 21-20. D.C. SOLID WASTE MANAGEMENT AND MULTI-MATERIAL RECYCLING |
| Chapter 21-22. WATER POLLUTION ENFORCEMENT |
| Chapter 21-23. EXPANDED POLYSTYRENE PROHIBITION |
| Chapter 21-40. RETAIL RATEMAKING |
| Chapter 21-41. RETAIL WATER AND SEWER RATES |
| Chapter 21-52. D.C. WATER AND SEWER AUTHORITY PERSONNEL REGULATIONS |
| Chapter 21-53. DISTRICT OF COLUMBIA WATER AND SEWER AUTHORITY PROCUREMENT REGULATIONS |
| Chapter 21-54. CROSS CONNECTIONS |