Rhode Island StatutesCHAPTER 23-19.3.1 - Residential Sanitary Sewer Connections§ 23-19.3.1-1 - Purpose.§ 23-19.3.1-2 - Definitions.§ 23-19.3.1-3 - Mandatory installation of check valves.§ 23-19.3.1-4 - Enforcement.§ 23-19.3.1-5 - Rules and regulations.