Divisions A4.3 & A4.4 — Water Efficiency, Material Conservation & Waste

Grounded in the retrieved California Green Building Standards Code (CALGreen) — click a citation to read the verbatim passage:

• CALGreen § 3.1. High relevance — show source text

  3. From Division A4.3, Water Efficiency and Conservation. 3.1. Comply with at least two elective measures selected from Division A4.3.
  4. From Division A4.4, Material Conservation and Resource Efficiency. 4.1. Comply with the 20 percent cement reduction requirements in Section A4.403.2. 4.2. Comply with the 10 percent recycled content requirements in Section A4.405.3.1. 4.3. Comply with the 65 percent reduction in construction waste in Section A4.408.1. 4.4. Comply with at least two elective measures selected from Division A4.4.
  5. From Division A4.5, Environmental Quality. 5.1. Comply with the 90 percent resilient flooring systems requirements in Section A4.504.2. 5.2. Comply with the thermal insulation requirements for Tier 1 in Section A4.504.3. 5.3. Comply with at least one elective measure selected from Division A4.5.

  Note: The Residential Occupancies Application Checklist contained in Section A4.602 may be used to show which elective measures are selected.

  A4.601.5 Tier 2. To achieve Tier 2 status a project must comply with the following.

  Note: The measures necessary to achieve Tier 2 status are very stringent. Cities, counties, and cities and counties considering adoption of Tier 2 as mandatory should carefully consider the stringency of each measure and ensure that the measures are achievable in their location.

  A4.601.5.1 Mandatory measures for Tier 2. The project shall meet or exceed all of the mandatory measures in Chapter 4, Divisions 4.1 through 4.5 and Chapter 7 as applicable.

  A4.601.5.2 Prerequisite and elective measures for Tier 2. In addition to the mandatory measures, compliance with the following prerequisite and elective measures from Appendix A4 is also required to achieve Tier 2 status.

  1. From Division A4.1, Planning and Design.

  2025 CALIFORNIA GREEN BUILDING STANDARDS CODE APPENDIX A4-21

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  APPENDIX A4 — RESIDENTIAL VOLUNTARY MEASURES

  1.1. Comply with the topsoil protection requirements for Tier 1 and Tier 2 in Section A4.106.2.3. 1.2. Comply with the 30 percent permeable paving requirements in Section A4.106.4. 1.3. Comply with the cool roof requirements in Section A4.106.5. 1.4. Comply with the Tier 2 electric vehicle (EV) charging requirements in Section A4.106.8. 1.5. Comply with at least four elective measures selected from Division A4.1. 2. From Division A4.2, Energy Efficiency. 2.1. For newly constructed low-rise residential buildings, comply with the energy efficiency requirements in Sections A4.203.1, A4.203.1.1, Table A4.203.1.1, A4.203.1.2 and A4.203.1.3.

  3. From Division A4.3, Water Efficiency and Conservation. 3.1. Comply with at least three elective measures selected from Division A4.3.
  4. From Division A4.4, Material Conservation and Resource Efficiency. 4.1.
• CALGreen § 101.7 High relevance — show source text

  As specified in Section 101.7, additional prerequisite measures may be included by the enforcing agency to address specific local environmental conditions and may be listed in the Innovative Concepts and Local Environmental Conditions portions of the checklist.

  A4.601.3 Elective measures. In addition to the required measures, Tier 1 and Tier 2 buildings must incorporate at least the number of elective measures specified in Sections A4.601.4.2 and A4.601.5.2.

  A4.601.4 Tier 1. To achieve Tier 1 status a project must comply with the following:

  A4.601.4.1 Mandatory measures for Tier 1. The project shall meet or exceed all of the mandatory measures in Chapter 4, Divisions 4.1 through 4.5 and Chapter 7 as applicable.

  A4.601.4.2 Prerequisite and elective measures for Tier 1. In addition to the mandatory measures, compliance with the following prerequisite and elective measures from Appendix A4 is also required to achieve Tier 1 status:

  1. From Division A4.1, Planning and Design. 1.1. Comply with the topsoil protection requirements in Section A4.106.2.3. 1.2. Comply with the 20 percent permeable paving requirements in Section A4.106.4. 1.3. Comply with the cool roof requirements in Section A4.106.5. 1.4. Comply with the Tier 1 electric vehicle (EV) charging requirements in Section A4.106.8. 1.5. Comply with at least two elective measures selected from Division A4.1.

  2. From Division A4.2, Energy Efficiency. 2.1. For newly constructed low-rise residential buildings, comply with the energy efficiency requirements in Sections A4.203.1, A4.203.1.1, Table A4.203.1.1, A4.203.1.2 and A4.203.1.3.

  3. From Division A4.3, Water Efficiency and Conservation. 3.1. Comply with at least two elective measures selected from Division A4.3.

  4. From Division A4.4, Material Conservation and Resource Efficiency. 4.1. Comply with the 20 percent cement reduction requirements in Section A4.403.2. 4.2. Comply with the 10 percent recycled content requirements in Section A4.405.3.1. 4.3. Comply with the 65 percent reduction in construction waste in Section A4.408.1. 4.4. Comply with at least two elective measures selected from Division A4.4.

  5. From Division A4.5, Environmental Quality. 5.1. Comply with the 90 percent resilient flooring systems requirements in Section A4.504.2. 5.2. Comply with the thermal insulation requirements for Tier 1 in Section A4.504.3. 5.3. Comply with at least one elective measure selected from Division A4.5.

  Note: The Residential Occupancies Application Checklist contained in Section A4.602 may be used to show which elective measures are selected.

  A4.601.5 Tier 2. To achieve Tier 2 status a project must comply with the following.

  Note: The measures necessary to achieve Tier 2 status are very stringent. Cities, counties, and cities and counties considering adoption of Tier 2 as mandatory should carefully consider the stringency of each measure and ensure that the measures are achievable in their location.

• CALGreen § 8-40 High relevance — show source text

  . . . . . . . . . . . . . 8-40

  APPENDIX A4 RESIDENTIAL

  VOLUNTARY MEASURES. . . . . . . . . . . . . . . . . APPENDIX A4-3

  A4.1 Planning and Design . . . . . . . . . . . . . . . . . APPENDIX A4-3 A4.2 Energy Efficiency . . . . . . . . . . . . . . . . . . . . APPENDIX A4-9 A4.3 Water Efficiency and Conservation . . . APPENDIX A4-13 A4.4 Material Conservation and Resource Efficiency . . . . . . . . . . . . . . . . . . . . . . . . APPENDIX A4-15 A4.5 Environmental Quality . . . . . . . . . . . . . . APPENDIX A4-19 A4.6 Tier 1 and Tier 2 . . . . . . . . . . . . . . . . . . . . APPENDIX A4-21

  Division A4.6—Residential Occupancies Application Checklist . . . . . . . . . . . . . APPENDIX A4-23 A4.7 Residential Model Ordinance . . . . . . . . . APPENDIX A4-31

  APPENDIX A5 NONRESIDENTIAL

  VOLUNTARY MEASURES. . . . . . . . . . . . . . . . . APPENDIX A5-3

  A5.1 Planning and Design . . . . . . . . . . . . . . . . . APPENDIX A5-3 A5.2 Energy Efficiency . . . . . . . . . . . . . . . . . . . APPENDIX A5-13 A5.3 Water Efficiency and Conservation . . . APPENDIX A5-19 A5.4 Material Conservation and Resource Efficiency . . . . . . . . . . . . . . . . . . . . . . . . APPENDIX A5-25 A5.5 Environmental Quality . . . . . . . . . . . . . . APPENDIX A5-35 A5.6 Voluntary Tiers . . . . . . . . . . . . . . . . . . . . . APPENDIX A5-41 A5.601 CALGren Tier 1 and Tier 2. . . . . . . . . . APPENDIX A5-41

  A5.602 CALGreen Verification Guidelines Mandatory Measures Checklist . . . . . . . . . . . . . . . APPENDIX A5-44

  A5.602.1 CALGreen Verification Guidelines

  Tier 1 Checklist . . . . . . . . . . . . . . . . . APPENDIX A5-48

  A5.602.2 CALGreen Verification Guidelines

  Tier 2 Checklist . . . . . . . . . . . . . . . . . APPENDIX A5-55

  APPENDIX A6 VOLUNTARY STANDARDS FOR HEALTH

• CALGreen § 303.1 High relevance — show source text

  2025 CALIFORNIA GREEN BUILDING STANDARDS CODE APPENDIX A4-11

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  APPENDIX A4-12 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE

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  A4 RESIDENTIAL VOLUNTARY MEASURES

  DIVISION A4.3 – WATER EFFICIENCY AND CONSERVATION

  SECTION A4.301—GENERAL (RESERVED)

  SECTION A4.302—DEFINITIONS (RESERVED)

  SECTION A4.303—INDOOR WATER USE

  A4.303.1 Kitchen faucets. The maximum flow rate of kitchen faucets shall not exceed 1.5 gallons per minute at 60 psi. Kitchen faucets may temporarily increase the flow above the maximum rate, but not to exceed 2.2 gallons per minute at 60 psi, and must default to a maximum flow rate of 1.5 gallons per minute at 60 psi.

  Note: Where complying faucets are unavailable, aerators or other means may be used to achieve reduction.

  A4.303.2 Alternate water sources for nonpotable applications. Alternate nonpotable water sources are used for indoor potable water reduction. Alternate nonpotable water sources shall be installed in accordance with the California Plumbing Code.

  A4.303.3 Appliances. Install at least one qualified ENERGY STAR dishwasher or clothes washer.

  Note: See Section A5.303.3 for nonresidential dishwashers and clothes washers.

  A4.303.4 Nonwater urinals and waterless toilets. Nonwater urinals or composting toilets are installed.

  Where approved, nonwater urinals with drain cleansing action (formerly hybrid urinals), as defined in Chapter 2, shall be considered nonwater urinals.

  A4.303.5 Hot water recirculation systems. One- and two-family dwellings shall be equipped with a demand hot water recirculation system, as defined in Chapter 2. The demand hot water recirculation system shall be installed in accordance with the California Plumbing Code, California Energy Code and the manufacturer’s installation instructions.

  SECTION A4.304—OUTDOOR WATER USE

  A4.304.1 Rainwater catchment systems. An approved rainwater catchment system is designed and installed to use rainwater generated by at least 65 percent of the available roof area. Rainwater catchment systems shall be designed and installed in accordance with the California Plumbing Code.

  A4.304.2 Potable water elimination. When landscaping is provided and as allowed by local ordinance, a water efficient landscape irrigation design that eliminates the use of potable water beyond the initial requirements for plant installation and establishment shall be provided. Methods used to accomplish the requirements of this section shall comply with the requirements of the California Building Standards Code and shall include, but not be limited to, the following:

  1. Use of captured rainwater.
  2. Use of recycled water.
  3. Water treated for irrigation purposes and conveyed by a water district or public entity.
  4. Use of graywater.
  5. Use of drought tolerant plants.

  A4.304.3 Landscape water meters. For new water service connections, landscaped irrigated areas less than 5,000 square feet shall be provided with separate submeters or metering devices for outdoor potable water use.

• CALGreen § 601.5.2 Medium relevance — show source text

  A4.601.5.2 Prerequisite and elective measures for Tier 2. In addition to the mandatory measures, compliance with the following prerequisite and elective measures from Appendix A4 is also required to achieve Tier 2 status.

  1. From Division A4.1, Planning and Design.

  2025 CALIFORNIA GREEN BUILDING STANDARDS CODE APPENDIX A4-21

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

  APPENDIX A4 — RESIDENTIAL VOLUNTARY MEASURES

  1.1. Comply with the topsoil protection requirements for Tier 1 and Tier 2 in Section A4.106.2.3. 1.2. Comply with the 30 percent permeable paving requirements in Section A4.106.4. 1.3. Comply with the cool roof requirements in Section A4.106.5. 1.4. Comply with the Tier 2 electric vehicle (EV) charging requirements in Section A4.106.8. 1.5. Comply with at least four elective measures selected from Division A4.1. 2. From Division A4.2, Energy Efficiency. 2.1. For newly constructed low-rise residential buildings, comply with the energy efficiency requirements in Sections A4.203.1, A4.203.1.1, Table A4.203.1.1, A4.203.1.2 and A4.203.1.3.

  3. From Division A4.3, Water Efficiency and Conservation. 3.1. Comply with at least three elective measures selected from Division A4.3.
  4. From Division A4.4, Material Conservation and Resource Efficiency. 4.1. Comply with the 25 percent cement reduction requirements in Section A4.403.2. 4.2. Comply with the 15 percent recycled content requirements in Section A4.405.3.1. 4.3. Comply with the 75 percent reduction in construction waste in Section A4.408.1. 4.4. Comply with at least four elective measures selected from Division A4.4.
  5. From Division A4.5, Environmental Quality. 5.1. Comply with the 100 percent resilient flooring systems requirements in Section A4.504.2. 5.2. Comply with the thermal insulation requirements for Tier 1 and Tier 2 in Section A4.504.3. 5.3. Comply with at least one elective measure selected from Division A4.5.

  Note: The Residential Occupancies Application Checklist contained in Section A4.602 may be used to show which elective measures are selected.

  APPENDIX A4-22 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE

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  DIVISION A4.6 – TIER 1 AND TIER 2

  SECTION A4.602 — RESIDENTIAL OCCUPANCIES APPLICATION CHECKLIST

• CALGreen § 305.2 Medium relevance — show source text

  A4.305.2 Recycled water piping. Based on projected availability, dual water piping is installed for future use of recycled water at the following locations:

  1. Interior piping for the use of recycled water is installed to serve all water closets, urinals and floor drains.
  2. Exterior piping is installed to transport recycled water from the point of connection to the structure. Recycled water systems shall be designed and installed in accordance with the California Plumbing Code.

  A4.305.3 Recycled water for landscape irrigation. Recycled water is used for landscape irrigation.

  2025 CALIFORNIA GREEN BUILDING STANDARDS CODE APPENDIX A4-13

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  APPENDIX A4 — RESIDENTIAL VOLUNTARY MEASURES

  SECTION A4.306 —INNOVATIVE CONCEPTS AND LOCAL ENVIRONMENTAL CONDITIONS

  A4.306.1 Innovative concepts and local environmental conditions. The provisions of this code are not intended to prevent the use of any alternate material, appliance, installation, device, arrangement, method, design or method of construction not specifically prescribed by this code. This code does not limit the authority of city, county, or city and county government to make necessary changes to the provisions contained in this code pursuant to Section 101.7.1.

  APPENDIX A4-14 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE

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  A4 RESIDENTIAL VOLUNTARY MEASURES

  DIVISION A4.4 – MATERIAL CONSERVATION AND RESOURCE EFFICIENCY

  SECTION A4.401—GENERAL (RESERVED)

  SECTION A4.402—DEFINITIONS

  A4.402.1 Definitions. The following terms are defined in Chapter 2.

  ASSEMBLY (ASSEMBLY PRODUCT).

  POSTCONSUMER CONTENT.

  PRECONSUMER (OR POSTINDUSTRIAL) CONTENT.

  PROPORTIONAL RECYCLED CONTENT (PRC M ).

  RECYCLED CONTENT (RC).

  RECYCLED CONTENT VALUE (RCV).

  Assembly products (RCV A ). Materials (RCV M ).

  SECTION A4.403—FOUNDATION SYSTEMS

  A4.403.1 Frost protected foundation systems. As allowed by local conditions, utilize a Frost-Protected Shallow Foundation (FPSF) in compliance with the California Residential Code (CRC). When an FPSF foundation system is installed, the manual required by Section 4.410.1 shall include instructions to the owner or occupant regarding the necessity for heating the structure as required in Section R403.3 of the California Residential Code.

  A4.403.2 Reduction in cement use. As allowed by the enforcing agency, cement used in foundation mix design shall be reduced as follows:

  Tier 1. Not less than a 20 percent reduction in cement use.

  Tier 2. Not less than a 25 percent reduction in cement use.

  Note: Products commonly used to replace cement in concrete mix designs include, but are not limited to:

  1. Fly ash.

  2. Slag.

  3. Silica fume.

  4. Rice hull ash.

  SECTION A4.404—EFFICIENT FRAMING TECHNIQUES

• CALGreen § 5.408.1.1 Medium relevance — show source text

  4**
  Material
  Conservation
  and Resource
  Efficiency
  (continued)|Mandatory|Construction waste management—comply with either:
  Sections 5.408.1.1, 5.408.1.2, 5.408.1.3 or more stringent local
  ordinance|5.408.1.1,
  5.408.1.2,
  5.408.1.3|||||

  APPENDIX A5-50 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE

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  APPENDIX A5 — NONRESIDENTIAL VOLUNTARY MEASURES

  CHAPTER 5 DIVISIONS	Col2	Col3	SECTION TITLE	CODE SECTION	Y	N	O	PLAN SHEET, SPEC OR ATTACH
  (continued) DIVISION 5.4 Material Conservation and Resource Efficiency Select One Elective	(continued) DIVISION 5.4 Material Conservation and Resource Efficiency Select One Elective	Mandatory	Construction waste management: documentation	5.408.1.4
  (continued) DIVISION 5.4 Material Conservation and Resource Efficiency Select One Elective	(continued) DIVISION 5.4 Material Conservation and Resource Efficiency Select One Elective	Mandatory	Universal waste [A]	5.408.2
  (continued) DIVISION 5.4 Material Conservation and Resource Efficiency Select One Elective	(continued) DIVISION 5.4 Material Conservation and Resource Efficiency Select One Elective	Mandatory	Excavated soil and land clearing debris (100% reuse or recycle) with Exception and Notes	5.408.3
  (continued) DIVISION 5.4 Material Conservation and Resource Efficiency Select One Elective	(continued) DIVISION 5.4 Material Conservation and Resource Efficiency Select One Elective	Mandatory	Life Cycle Assessment, Scope, Whole building life cycle assessment with Notes, Building components, Reference study period, and Verification of compliance	5.409.1, 5.409.2, 5.409.2.1, 5.409.2.2 _and 5.409.2.

• CALGreen § 8-6 Medium relevance — show source text

  . . . . . . . . . . . . . . . 8-6 Worksheet (WS-9) 5.409.2 and A5.409.2 Whole Building Life Cycle Assessment: . . . . . . . . . . . . . . . . 8-7 Construction Waste Management (CWM) Plan . . . . . . . . . . . 8-8 Construction Waste Management (CWM) Worksheet. . . . . . 8-9 Construction Waste Management (CWM) Acknowledgment. . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-10 Title 23, Waters, California Code of Regulations . . . . . . . . . 8-11 Commissioning Referenced Standards for Non-energy Systems. . . . . . . . . . . . . . . . . . . . . . . . . 8-13 IES TM-15-11 Table A-1, Table 130.2-A and Table 130.2-B Uplight and Glare Ratings Tables. . . . . . . . . . . . . . 8-40

  APPENDIX A4 RESIDENTIAL

  VOLUNTARY MEASURES. . . . . . . . . . . . . . . . . APPENDIX A4-3

  A4.1 Planning and Design . . . . . . . . . . . . . . . . . APPENDIX A4-3 A4.2 Energy Efficiency . . . . . . . . . . . . . . . . . . . . APPENDIX A4-9 A4.3 Water Efficiency and Conservation . . . APPENDIX A4-13 A4.4 Material Conservation and Resource Efficiency . . . . . . . . . . . . . . . . . . . . . . . . APPENDIX A4-15 A4.5 Environmental Quality . . . . . . . . . . . . . . APPENDIX A4-19 A4.6 Tier 1 and Tier 2 . . . . . . . . . . . . . . . . . . . . APPENDIX A4-21

  Division A4.6—Residential Occupancies Application Checklist . . . . . . . . . . . . . APPENDIX A4-23 A4.7 Residential Model Ordinance . . . . . . . . . APPENDIX A4-31

  APPENDIX A5 NONRESIDENTIAL

  VOLUNTARY MEASURES. . . . . . . . . . . . . . . . . APPENDIX A5-3

• CALGreen § 602.1 Medium relevance — show source text

  VOLUNTARY MEASURES. . . . . . . . . . . . . . . . . APPENDIX A5-3

  A5.1 Planning and Design . . . . . . . . . . . . . . . . . APPENDIX A5-3 A5.2 Energy Efficiency . . . . . . . . . . . . . . . . . . . APPENDIX A5-13 A5.3 Water Efficiency and Conservation . . . APPENDIX A5-19 A5.4 Material Conservation and Resource Efficiency . . . . . . . . . . . . . . . . . . . . . . . . APPENDIX A5-25 A5.5 Environmental Quality . . . . . . . . . . . . . . APPENDIX A5-35 A5.6 Voluntary Tiers . . . . . . . . . . . . . . . . . . . . . APPENDIX A5-41 A5.601 CALGren Tier 1 and Tier 2. . . . . . . . . . APPENDIX A5-41

  A5.602 CALGreen Verification Guidelines Mandatory Measures Checklist . . . . . . . . . . . . . . . APPENDIX A5-44

  A5.602.1 CALGreen Verification Guidelines

  Tier 1 Checklist . . . . . . . . . . . . . . . . . APPENDIX A5-48

  A5.602.2 CALGreen Verification Guidelines

  Tier 2 Checklist . . . . . . . . . . . . . . . . . APPENDIX A5-55

  APPENDIX A6 VOLUNTARY STANDARDS FOR HEALTH

  FACILITIES [OSHPD 1, 2 & 4] . . . . . . . . . . . APPENDIX A6.1-3 A6.1 Site Planning and Design . . . . . . . . . . . APPENDIX A6.1-3 A6.2 Energy Efficiency . . . . . . . . . . . . . . . . . . APPENDIX A6.1-3 A6.4 Material Conservation and Resource Efficiency . . . . . . . . . . . . . APPENDIX A6.1-32 A6.5 Environmental Quality . . . . . . . . . . . . APPENDIX A6.1-33

  INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . INDEX-1

  HISTORY NOTE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HIST-1

  2025 CALIFORNIA GREEN BUILDING STANDARDS CODE vii

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  viii 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE

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  CALIFORNIA GREEN BUILDING STANDARDS CODE – MATRIX ADOPTION TABLE

  CHAPTER 1 – ADMINISTRATION

  (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