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Appendix CG — NONSEWERED SANITATION SYSTEMS

2025 California Residential Code (Title 24, Part 2.5) · 2025 edition · updated 2026-07-27 · California

Italicized text is a California amendment to the model code, as printed in the official publication.

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

CG101.1 Applicability.

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

CG101.2 System requirements.

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

CG102—DEFINITIONS

CG102.1 General. 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

CG103.1 General.

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

CG103.2 Operating conditions.

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.

CG103.3 Clearances for servicing and maintenance.

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.

CG103.4 Backflow prevention.

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

CG103.5 Effluent storage.

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.

CG103.6 Systems employing combustion.

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

CG103.7 Connection to plumbing system not required.

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

CG104—MANUAL REQUIRED

CG104.1 Operation and maintenance manual.

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

CG105—SYSTEM OUTPUT

CG105.1 General.

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

CG106—REFERENCED STANDARDS

CG106.1 General.

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

STANDARD
ACRONYM		 STANDARD NAME SECTIONS HEREIN
REFERENCED
ANSI/CAN/IAPMO/ISO 30500—2019 Non-sewered sanitation systems — Prefabricated integrated treatment units
— General safety and performance requirements for design and testing		 CG101.2

on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

APPENDIX CG-4 2025 CALIFORNIA RESIDENTIAL CODE

on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

CALIFORNIA RESIDENTIAL CODE – MATRIX ADOPTION TABLE

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.)

Adopting agency BSC BSC-
CG		 SFM HCD DSA OSHPD BSCC DPH AGR DWR CEC CA SL SLC
Adopting agency BSC BSC-
CG		 SFM 1 2 1/AC ** AC** SS SS/CC 1 1R 2 3 4 5 5 5 5 5 5 5 5 5
Adopt entire chapter
Adopt entire chapter as
amended (amended
sections listed below)
Adopt only those sections
that are listed below
Chapter / Section

on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

APPENDIX CH-2 2025 CALIFORNIA RESIDENTIAL CODE

on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

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▸ Contents — 2025 California Residential Code (Title 24, Part 2.5)
2025 California Residential Code (Title 24, Part 2.5)
  1. Chapter 1 — ADMINISTRATION
  2. Chapter 2 — DEFINITIONS
  3. Chapter 3 — BUILDING PLANNING
  4. Chapter 4 — FOUNDATIONS
  5. Chapter 5 — FLOORS
  6. Chapter 6 — WALL CONSTRUCTION
  7. Chapter 7 — WALL COVERING
  8. Chapter 8 — ROOF-CEILING CONSTRUCTION
  9. Chapter 9 — ROOF ASSEMBLIES
  10. Chapter 10 — CHIMNEYS AND FIREPLACES
  11. Chapter 44 — REFERENCED STANDARDS
  12. Appendix AA — BOARD OF APPEALS
  13. Appendix AB — PERMIT FEES
  14. Appendix AC — RESERVED
  15. Appendix BA — RESERVED
  16. Appendix BB — TINY HOUSES
  17. Appendix BC — RESERVED
  18. Appendix BD — RESERVED
  19. Appendix BE — RADON CONTROL METHODS
  20. Appendix BF — PATIO COVERS
  21. Appendix BG — SOUND TRANSMISSION
  22. Appendix BH — AUTOMATIC VEHICULAR GATES
  23. Appendix BI — LIGHT STRAW-CLAY CONSTRUCTION
  24. Appendix BJ — STRAWBALE CONSTRUCTION
  25. Appendix BK — COB CONSTRUCTION (MONOLITHIC ADOBE)
  26. Appendix BL — HEMP-LIME (HEMPCRETE) CONSTRUCTION
  27. Appendix BM — 3D-PRINTED BUILDING CONSTRUCTION
  28. Appendix BN — EXTENDED PLATE WALL CONSTRUCTION
  29. Appendix BO — EXISTING BUILDINGS AND STRUCTURES
  30. Appendix CA — RESERVED
  31. Appendix CB — RESERVED
  32. Appendix CC — RESERVED
  33. Appendix CD — RESERVED
  34. Appendix CE — RESERVED
  35. Appendix CF — RESERVED
  36. Appendix CG — NONSEWERED SANITATION SYSTEMS
  37. Appendix CH — PRIVATE SEWAGE DISPOSAL
  38. Appendix CI — SWIMMING POOL SAFETY ACT
  39. Appendix CJ — EMERGENCY HOUSING
  40. Appendix CK — AREAS PROTECTED BY THE FACILITIES OF THE CENTRAL…

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