Appendix CG Nonsewered Sanitation Systems — 2025 California Residential Code

The provisions contained in this appendix are not mandatory unless specifically adopted by a state agency or referenced in the adopting ordinance.

User notes:

About this appendix: This appendix addresses the considerations that need to be taken into account by building officials regarding the placement and installation of nonsewered sanitation systems in buildings. This appendix would permit the installation of a of these systems and provide an exception to the general requirement in the California Plumbing Code and this code that sanitation devices be connected to the building drainage system.

CG101—GENERAL

The provisions of this chapter shall apply to the installation of nonsewered sanitation systems.

Nonsewered sanitation systems shall comply with ANSI/CAN/IAPMO/ISO CG106.1.

CG102—DEFINITIONS

For purposes of this chapter, the following definitions shall apply:

CONDITIONED SPACE. An area, room or space normally occupied and being heated or cooled for human habitation by any equipment.

NONSEWERED SANITATION SYSTEM. A prefabricated integrated sewage treatment unit that is not connected to a public sewer or private sewage disposal system.

CG103—INSTALLATION

The installation of nonsewered sanitation systems shall be in accordance with the manufacturer’s installation instructions and with Sections CG103.2 through CG103.7.

A nonsewered sanitation system in either a conditioned or unconditioned space shall be installed where the ambient temperature, ambient humidity and altitude ( atmospheric pressure ) are in accordance with the manufacturer’s installation instructions or product listing.

A nonsewered sanitation system shall be located to permit access and sufficient clearance for service and maintenance. Unless otherwise specified by the manufacturer’s installation instructions, not less than 30 inches (762 mm) in depth, width and height of working space shall be provided at any access panel.

A domestic water supply connection to a nonsewered sanitation system shall be protected in accordance with Section P2902.

Any container or vessel for the storage of effluent discharged from a nonsewered sanitation system and not integral to such system shall be installed in accordance with Section P2910.9.

A nonsewered sanitation system employing combustion shall comply with the California Mechanical Code .

A nonsewered sanitation system is not required to be connected to the sanitary drainage system of the building or premises.

CG104—MANUAL REQUIRED

Nonsewered sanitation systems shall have an operation and maintenance manual provided by the manufacturer.

CG105—SYSTEM OUTPUT

The use or disposal of all substances exiting the nonsewered sanitation system shall be determined by the authority having jurisdiction.

CG106—REFERENCED STANDARDS

See Table CG106.1 for standards that are referenced in various sections of this appendix. Standards are listed by the standard identification with the effective date, the standard title and the section or sections of this appendix that reference the standard.

TABLE CG106.1—REFERENCED STANDARDS

APPENDIX CH – PRIVATE SEWAGE DISPOSAL

(Matrix Adoption Tables are nonregulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)