Common water and landscape definitions used by CALGreen

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

• CALGreen § 5.410.2.2 Medium relevance — show source text

  COMPLIANCE TEMPLATE

  Documentation of the Basis of Design (BOD) is a step required for compliance with CALGreen Code, Section 5.410.2.2, for newly constructed buildings greater than 10,000 square feet. This template is a guide for use by the design team.

  1. Renewable Energy Systems

  1.1. Narrative Description of System A. [System type(s), location, inverter type, control type, performance, efficiency, energy savings, payback period] B. [Describe how system meets any special requirements listed in the Owner’s Project Requirements document.]

  1.2. Reasons for System Selection

  [Reasons that the selected renewable energy systems are a better choice than alternatives (e.g., performance, efficiency, reliability, flexibility, simplicity, expandability, cost, payback period, utility company incentives, owner preference, space constraints, cost, owner preferences, ease of maintenance, etc.)]

  1.3. Renewable Energy System Generation Calculations

  [Describe sizing calculation method, assumptions and results]

  2. Landscape Irrigation Systems

  2.1. Narrative Description of System A. [System type(s), location, control type, performance, efficiency, water savings] B. [Describe how system meets any special requirements listed in the Owner’s Project Requirements document.]

  2.2. Reasons for System Selection

  [Reasons that the selected landscape irrigation systems are a better choice than alternatives (e.g., performance, efficiency, reliability, flexibility, simplicity, expandability, cost, payback period, utility company incentives, owner preference, cost, owner preferences, ease of maintenance, etc.)]

  2.3. Landscape Irrigation System Calculations

  [Describe sizing calculation method, assumptions and results]

  3. Water Reuse Systems

  3.1. Narrative Description of System A. [System type(s), location, space requirements, equipment requirements, control type, performance, efficiency, potable water savings, payback period] B. [Describe how system meets any special requirements listed in the Owner’s Project Requirements document.]

  3.2. Reasons for System Selection

  [Reasons that the selected water reuse systems are a better choice than alternatives (e.g., performance, efficiency, reliability, flexibility, simplicity, expandability, cost, payback period, utility company incentives, owner preference, space constraints, cost, owner preferences, ease of maintenance, etc.)]

  3.3. Water Reuse System Calculations

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  COMPLIANCE FORMS, WORKSHEETS AND REFERENCE MATERIAL

  BASIS OF DESIGN (BOD)

  COMPLIANCE CHECKLIST

  [Describe sizing calculation method, assumptions and results]

  INCORPORATE THIS FORM IN THE PLANS

  Project Address: ________________________________________________________

  Permit Number: _____________________________

• CALGreen § 407.1 Medium relevance — show source text

  DEDICATED WATER METERING REQUIREMENTS

  APPLICATION	REQUIREMENTS
  Cooling Towers	The makeup water supply to cooling towers, evaporative condensers, and fluid coolers. Cooling towers sharing a common basin can be grouped together using one meter.
  Evaporative Coolers	The makeup water supply to an evaporative cooler having an air flow exceeding 30 000 cubic feet per minute (ft3/min).
  Fluid Coolers and Chillers – Open Systems	The makeup water supply on water-cooled fluid coolers and chillers not utilizing closed- loop recir- culation.
  Hydronic Cooling Systems – Closed Loop	Systems with 50 ton or greater of cooling capacity and where a make-up water supply is connected.
  Hydronic Heating Systems	The makeup water supply to one or more boilers collectively exceeding 1 000 000 British thermal units per hour (Btu/h).
  Industrial Processes	The water supply to an industrial water-using process where the average consumption exceeds 1000 gallons per day (gal/d). Like equipment sharing one common water supply can be grouped together using one meter. Exception: Processes using untreated water where the water is directly returned to the original source after use.
  Landscape Irrigation	Landscape irrigation water where either of the following conditions exist: (1) Total accumulated landscape area with in-ground irrigation system exceeds 2500 square feet (ft2), or (2) Total accumulated landscape area using an automatic irrigation controller exceeds 1500 square feet (ft2) Exception: Where the water purveyor provides a separate water supply meter that serves only the irrigation system, an additional dedicated meter is not required.
  Onsite Water Collection Systems	Potable or reclaimed water supplies for supplementing onsite alternative water collection systems.
  Ornamental Water Features	Potable or reclaimed water supplies for ornamental water features where the water feature uses an automatic refill valve.
  Roof Spray Systems	Roof spray systems for irrigating vegetated roofs or thermal conditioning covering an area greater than 300 square feet (ft2). Exception: Temporary above-surface spray systems connected to a hose bibb and without an auto- matic controller are not required to have a dedicated meter
  Tenant Buildings - Common Areas	Water supplies used in common areas of a site. The dedicated meter for common area water use shall not include water supplied inside tenant space. Water supplies for sanitary fixtures and other water use in common areas can be grouped together for metering requirements, except where dedi- cated water meter installations are otherwise required.
  Tenant Spaces - Residential	All water supplies to each residential tenant space for indoor water use. Exception: Where a water purveyor has individual meters for each tenant space, and the other meter requirements included in Table L 407.1 do not apply, no additional dedicated meter is required.
  Tenant Spaces - Non-residential, car washes	All water supplies to individual non-residential tenant spaces for indoor water use where any of the following conditions exist: (1) The nominal size of a water supply pipe(s) to the individual tenant space is greater than ½ inch, or (2) Water consumption within in the tenant space is estimated or expected to average greater than 1000 gallons/day (gal/d). Where water is supplied to tenant space that is not required to have dedicated meter,

• CALGreen § 4.303.1.2 Medium relevance — show source text

  Note: The effective flush volume of dual flush toilets is defined as the composite, average flush volume of two reduced flushes and one full flush.

  4.303.1.2 Urinals. The effective flush volume of wall-mounted urinals shall not exceed 0.125 gallons per flush. The effective flush volume of all other urinals shall not exceed 0.5 gallons per flush.

  4.303.1.3 Showerheads.

  4.303.1.3.1 Single showerhead. Showerheads shall have a maximum flow rate of not more than 1.8 gallons per minute at 80 psi. Showerheads shall be certified to the performance criteria of the US EPA WaterSense Specification for Showerheads.

  4.303.1.3.2 Multiple showerheads serving one shower. When a shower is served by more than one showerhead, the combined flow rate of all showerheads and/or other shower outlets controlled by a single valve shall not exceed 1.8 gallons per minute at 80 psi, or the shower shall be designed to allow only one shower outlet to be in operation at a time.

  Note: A hand-held shower shall be considered a showerhead.

  4.303.1.4 Faucets.

  4.303.1.4.1 Residential lavatory faucets. The maximum flow rate of residential lavatory faucets shall not exceed 1.2 gallons per minute at 60 psi. The minimum flow rate of residential lavatory faucets shall not be less than 0.8 gallons per minute at 20 psi.

  4.303.1.4.2 Lavatory faucets in common and public use areas. The maximum flow rate of lavatory faucets installed in common and public use areas (outside of dwellings or sleeping units) in residential buildings shall not exceed 0.5 gallons per minute at 60 psi.

  4.303.1.4.3 Metering faucets. Metering faucets when installed in residential buildings shall not deliver more than 0.2 gallons per cycle.

  4.303.1.4.4 Kitchen faucets. The maximum flow rate of kitchen faucets shall not exceed 1.8 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 1.8 gallons per minute at 60 psi.

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

  4.303.1.4.5 Pre-rinse spray valves. When installed, commercial pre-rinse spray valves shall meet the requirements in the California Plumbing Code, Section 420.3.

  4.303.2 Submeters for multifamily buildings and dwelling units in mixed-use residential/commercial buildings. Submeters shall be installed to measure water usage of individual rental dwelling units in accordance with the California Plumbing Code.

  4.303.3 Standards for plumbing fixtures and fittings. Plumbing fixtures and fittings shall be installed in accordance with the Cali- fornia Plumbing Code, and shall meet the applicable standards referenced in Table 1701.1 of the California Plumbing Code.

  SECTION 4.304—OUTDOOR WATER USE

  4.304.1 Outdoor potable water use in landscape areas. Residential developments shall comply with a local water efficient landscape ordinance or the current California Department of Water Resources’ Model Water Efficient Landscape Ordinance (MWELO), whichever is more stringent.

• CALGreen § 5.304.6 Medium relevance — show source text

  5.304.6 Outdoor potable water use in landscape areas. For public schools and community colleges, landscape projects as described in Sections 5.304.6.1 and 5.304.6.2 shall comply with the California Department of Water Resources Model Water Efficient Landscape Ordinance (MWELO) commencing with Section 490 of Chapter 2.7, Division 2, Title 23, California Code of Regulations, except that the evapotranspiration adjustment factor (ETAF) shall be 0.65 with an additional water allowance for special landscape areas (SLA) of 0.35.

  Exception: Any project with an aggregate landscape area of 2,500 square feet or less may comply with the prescriptive measures contained in Appendix D of the MWELO.

  5.304.6.1 Newly constructed landscapes. New construction projects with an aggregate landscape area equal to or greater than 500 square feet.

  5.304.6.2 Rehabilitated landscapes. Rehabilitated landscape projects with an aggregate landscape area equal to or greater than 1,200 square feet.

  SECTION 5.305—WATER REUSE SYSTEMS (RESERVED)

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  CALIFORNIA GREEN BUILDING STANDARDS CODE – MATRIX ADOPTION TABLE

  CHAPTER 5 – NONRESIDENTIAL MANDATORY MEASURES

  DIVISION 5.4 – MATERIAL CONSERVATION AND RESOURCE EFFICIENCY

  (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	Col6	Col7	DSA	Col9	OSHPD	Col11	Col12	Col13	Col14	Col15	BSCC	DPH	AGR	DWR	CEC	CA	SL	SLC
  Adopting agency	BSC	BSC- CG	SFM	1	2	1/AC	AC	SS	1	1R	2	3	4	5	5	5	5	5	5	5	5	5
  Adopt entire CA chapter		X
  Adopt entire chapter as amended (amended sections listed below)
  Adopt only those sections that are listed below								X
  Chapter/Section
  5.401.1								X
  5.402.1 Definitions								X
  5.407 and subsections								X
  5.408.1 and subsections								X
  5.409 and subsections								X
  5.410.1								X
  5.410.1.

• CALGreen § 303.1 Medium 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 § 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.

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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.

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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 § 5.303.5 Medium relevance — show source text

  Note: This code section does not affect local jurisdiction authority to prohibit or require disposer installation.

  5.303.5 Areas of addition or alteration. For those occupancies within the authority of the California Building Standards Commission as specified in Section 103, the provisions of Sections 5.303.3 and 5.303.4 shall apply to new fixtures in additions or areas of alteration to the building.

  5.303.6 Standards for plumbing fixtures and fittings. Plumbing fixtures and fittings shall be installed in accordance with the Cali- fornia Plumbing Code, and shall meet the applicable standards referenced in Table 1701.1 of the California Plumbing Code and in Chapter 6 of this code.

  SECTION 5.304—OUTDOOR WATER USE

  5.304.1 Outdoor potable water use in landscape areas. Nonresidential developments shall comply with a local water efficient landscape ordinance or the current California Department of Water Resources’ Model Water Efficient Landscape Ordinance (MWELO), whichever is more stringent.

  Notes:

  1. The Model Water Efficient Landscape Ordinance (MWELO) is located in the California Code of Regulations, Title 23, Chapter 2.7, Division 2.

  2. MWELO and supporting documents, including a water budget calculator, are available at: https://www.water.ca.gov/.

  5.304.2 Reserved.

  5.304.3 Reserved.

  5.304.4 Reserved.

  5.304.5 Reserved.

  5.304.6 Outdoor potable water use in landscape areas. For public schools and community colleges, landscape projects as described in Sections 5.304.6.1 and 5.304.6.2 shall comply with the California Department of Water Resources Model Water Efficient Landscape Ordinance (MWELO) commencing with Section 490 of Chapter 2.7, Division 2, Title 23, California Code of Regulations, except that the evapotranspiration adjustment factor (ETAF) shall be 0.65 with an additional water allowance for special landscape areas (SLA) of 0.35.

  Exception: Any project with an aggregate landscape area of 2,500 square feet or less may comply with the prescriptive measures contained in Appendix D of the MWELO.

  5.304.6.1 Newly constructed landscapes. New construction projects with an aggregate landscape area equal to or greater than 500 square feet.

  5.304.6.2 Rehabilitated landscapes. Rehabilitated landscape projects with an aggregate landscape area equal to or greater than 1,200 square feet.

  SECTION 5.305—WATER REUSE SYSTEMS (RESERVED)

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  CALIFORNIA GREEN BUILDING STANDARDS CODE – MATRIX ADOPTION TABLE

  CHAPTER 5 – NONRESIDENTIAL MANDATORY MEASURES

  DIVISION 5.4 – MATERIAL CONSERVATION AND RESOURCE EFFICIENCY

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

• CALGreen § 411.8 Medium relevance — show source text

  The posted data, where applicable to the settings of the controller, shall include:

  (a) Precipitation rate for each zone. (b) Plant evapotranspiration coefficients for each zone. (c) Soil absorption rate for each zone. (d) Rain sensor settings. (e) Soil moisture setting. (f) Peak demand schedule including run times for each zone and the number of cycles to mitigate runoff and monthly adjustments or percentage change from peak demand schedule. L 411.8 Irrigation Flow Sensing System. On commercial landscape irrigation systems, an irrigation flow sensing system shall be installed that shall interface with the control system to suspend irrigation for abnormal flow conditions. If equipped with totalizer capabilities, the irrigation flow sensing system shall also function as a meter for irrigation water. L 411.9 Low Flow Irrigation. Irrigation zones using low flow irrigation emitters [with emitter flow rates not to exceed 6.3 gallons (24 L) per hour] shall comply with ASABE/ICC 802 Landscape Irrigation Sprinkler and Emitter Standard and shall be equipped with filters sized according to the manufacturer’s recommendation for the specific low flow emitter, and with a pressure regulator installed upstream of the irrigation emission devices as necessary to reduce the operating water pressure in accordance with the manufacturers’ equipment requirements.

  506 2025 CALIFORNIA PLUMBING CODE

  ), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.

  APPENDIX L

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  L 411.14 Sprinkler Head Installations. All installed sprinkler heads shall comply with ASABE/ICC 802 or other approved standard(s).

  L 411.14.1 Sprinkler Heads in Common Irrigation Zones. Sprinkler heads installed in irrigation zones served by a common valve shall be limited to applying water to plants with similar irrigation needs, and shall have matched precipitation rates (identical inches of water application per hour plus or minus 7 percent as labeled or declared in manufacturer’s published performance data).

  L 411.14.2 Sprinkler Head Pressure Regulation. Sprinkler heads shall utilize pressure regulating devices (as part of an irrigation system or integral to the sprinkler body) to maintain manufacturer’s recommended operating pressure for each sprinkler and nozzle type. Spray sprinkler bodies with integral pressure regulation shall be listed to the EPA WaterSense Specification for Spray Sprinkler Bodies.

  L 411.14.3 Pop-up Type Sprinkler Heads. Where pop-up type sprinkler heads are installed, the sprinkler heads shall rise to a height above vegetation level and of not less than 4 inches (102 mm) above the soil level where emitting water.

  L 411.14.4 Sprinkler Head Maximum Precipita- tion Rate. Where the slope of the landscape exceeds 25 percent, the precipitation rate of sprinkler heads shall not exceed 1.75 inches (44 mm) per hour when tested to ASABE/ICC 802.

  L 411.15 Outside Hose Bibbs. Outside hose bibbs shall be

  allowed on irrigation pipe downstream of the backflow preventer. Hose bibbs supplying water from the irrigation system shall be indicated by posted signs marked with the words: “CAUTION: NONPOTABLE WATER. DO NOT DRINK”

  and the symbol in Figure 1505.10 of this code.

• CALGreen § 406.0 Medium relevance — show source text

  L 406.0 Fountains and Other Water Features.

  L 406.1 Use of Alternate Water Source for Special Water Features. Special water features such as ponds and water fountains shall be provided with reclaimed (recycled) water, rainwater, or on-site treated nonpotable water where the source and capacity are available on the premises and approved by the Authority Having Jurisdiction.

  L 407.0 Meters.

  L 407.1 Required. A water meter shall be required for each building site connected to a public water system, including municipally supplied reclaimed (recycled) water. In other than single-family houses, a dedicated meter shall be installed in accordance with Table L 407.1.

  L 407.2 Approval. Dedicated meters, other than water utility meters shall be approved by the Authority Having Jurisdiction for the intended use.

  L 407.3 Remote Data Transfer Requirements. Where more than 10 non-utility-owned water meters are located at a building site, the meters shall include remote data transfer capability to collect and analyze the data at a single location.

  L 407.4 Access. Meters and submeters shall be accessible.

  L 408.0 Condensate Recovery. L 408.1 General. Condensate is permitted to be used as onsite treated nonpotable water when collected, stored, and treated in accordance with Section 1506.0.

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  2025 CALIFORNIA PLUMBING CODE 503

  ), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.

  APPENDIX L

  TABLE L 407.1

  DEDICATED WATER METERING REQUIREMENTS

  APPLICATION	REQUIREMENTS
  Cooling Towers	The makeup water supply to cooling towers, evaporative condensers, and fluid coolers. Cooling towers sharing a common basin can be grouped together using one meter.
  Evaporative Coolers	The makeup water supply to an evaporative cooler having an air flow exceeding 30 000 cubic feet per minute (ft3/min).
  Fluid Coolers and Chillers – Open Systems	The makeup water supply on water-cooled fluid coolers and chillers not utilizing closed- loop recir- culation.
  Hydronic Cooling Systems – Closed Loop	Systems with 50 ton or greater of cooling capacity and where a make-up water supply is connected.
  Hydronic Heating Systems	The makeup water supply to one or more boilers collectively exceeding 1 000 000 British thermal units per hour (Btu/h).
  Industrial Processes	The water supply to an industrial water-using process where the average consumption exceeds 1000 gallons per day (gal/d). Like equipment sharing one common water supply can be grouped together using one meter. Exception: Processes using untreated water where the water is directly returned to the original source after use.
  Landscape Irrigation	Landscape irrigation water where either of the following conditions exist: (1) Total accumulated landscape area with in-ground irrigation system exceeds 2500 square feet (ft2), or (2) Total accumulated landscape area using an automatic irrigation controller exceeds 1500 square feet (ft2) Exception: Where the water purveyor provides a separate water supply meter that serves only the irrigation system, an additional dedicated meter is not required.

• CALGreen § 4.303.1.4.3 Medium relevance — show source text

  4.303.1.4.3 Metering faucets. Metering faucets when installed in residential buildings shall not deliver more than 0.2 gallons per cycle.

  4.303.1.4.4 Kitchen faucets. The maximum flow rate of kitchen faucets shall not exceed 1.8 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 1.8 gallons per minute at 60 psi.

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

  4.303.1.4.5 Pre-rinse spray valves. When installed, commercial pre-rinse spray valves shall meet the requirements in the California Plumbing Code, Section 420.3.

  4.303.2 Submeters for multifamily buildings and dwelling units in mixed-use residential/commercial buildings. Submeters shall be installed to measure water usage of individual rental dwelling units in accordance with the California Plumbing Code.

  4.303.3 Standards for plumbing fixtures and fittings. Plumbing fixtures and fittings shall be installed in accordance with the Cali- fornia Plumbing Code, and shall meet the applicable standards referenced in Table 1701.1 of the California Plumbing Code.

  SECTION 4.304—OUTDOOR WATER USE

  4.304.1 Outdoor potable water use in landscape areas. Residential developments shall comply with a local water efficient landscape ordinance or the current California Department of Water Resources’ Model Water Efficient Landscape Ordinance (MWELO), whichever is more stringent.

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  RESIDENTIAL MANDATORY MEASURES

  Notes:

  1. The Model Water Efficient Landscape Ordinance (MWELO) is located in the California Code of Regulations, Title 23, Chapter 2.7, Division 2.

  MWELO and supporting documents, including a water budget calculator, are available at: https://www.water.ca.gov/

  SECTION 4.305—WATER REUSE SYSTEMS (RESERVED)

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  4 RESIDENTIAL MANDATORY MEASURES

  DIVISION 4.4 – MATERIAL CONSERVATION AND RESOURCE EFFICIENCY

  SECTION 4.401—GENERAL

  4.401.1 Scope. The provisions of this chapter shall outline means of achieving material conservation and resource efficiency through protection of buildings from exterior moisture; construction waste diversion; employment of techniques to reduce pollution through recycling of materials; and building commissioning or testing, adjusting and balancing.

  SECTION 4.402—DEFINITIONS

  4.402.1 Definitions. Reserved.

  SECTION 4.403 —FOUNDATION SYSTEMS (RESERVED)

  SECTION 4.404—EFFICIENT FRAMING TECHNIQUES (RESERVED)

  SECTION 4.405—MATERIAL SOURCES (RESERVED)

  SECTION 4.406—ENHANCED DURABILITY AND REDUCED MAINTENANCE

• CALGreen § 4.408.3 Medium relevance — show source text

  4.408.3 Waste management company. Utilize a waste management company, approved by the enforcing agency, which can provide verifiable documentation that the percentage of construction and demolition waste material diverted from the landfill complies with Section 4.408.1.

  Note: The owner or contractor may make the determination if the construction and demolition waste materials will be diverted by a waste management company.

  2025 CALIFORNIA GREEN BUILDING STANDARDS CODE 4-11

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  RESIDENTIAL MANDATORY MEASURES

  4.408.4 Waste stream reduction alternative [LR]. Projects that generate a total combined weight of construction and demolition waste disposed of in landfills, which do not exceed 3.4 pounds per square foot of the building area shall meet the minimum 65 percent construction waste reduction requirement in Section 4.408.1.

  4.408.4.1 Waste stream reduction alternative. Projects that generate a total combined weight of construction and demolition waste disposed of in landfills, which do not exceed 2 pounds per square foot of the building area, shall meet the minimum 65 percent construction waste reduction requirement in Section 4.408.1.

  4.408.5 Documentation. Documentation shall be provided to the enforcing agency which demonstrates compliance with Section 4.408.2, Items 1 through 5, Section 4.408.3 or Section 4.408.4.

  Notes:

  1. Sample forms found in “A Guide to the California Green Building Standards Code (Residential)” located at http://www.hcd.ca.gov/building-standards/calgreen/cal-green-forms.html may be used to assist in documenting compliance with this section.
  2. Mixed construction and demolition debris (C&D) processors can be located at the California Department of Resources Recycling and Recovery (CalRecycle).

  SECTION 4.409—LIFE CYCLE ASSESSMENT (RESERVED)

  SECTION 4.410—BUILDING MAINTENANCE AND OPERATION

  4.410.1 Operation and maintenance manual. At the time of final inspection, a manual, compact disc, web-based reference or other media acceptable to the enforcing agency which includes all of the following shall be placed in the building:

  1. Directions to the owner or occupant that the manual shall remain with the building throughout the life cycle of the structure.

  2. Operation and maintenance instructions for the following: a. Equipment and appliances, including water-saving devices and systems, HVAC systems, photovoltaic systems, electric vehicle chargers, water-heating systems and other major appliances and equipment. b. Roof and yard drainage, including gutters and downspouts. c. Space conditioning systems, including condensers and air filters. d. Landscape irrigation systems.

  e. Water reuse systems. 3. Information from local utility, water and waste recovery providers on methods to further reduce resource consumption, including recycle programs and locations. 4. Public transportation and/or carpool options available in the area. 5. Educational material on the positive impacts of an interior relative humidity between 30–60 percent and what methods an occupant may use to maintain the relative humidity level in that range. 6. Information about water-conserving landscape and irrigation design and controllers which conserve water. 7. Instructions for maintaining gutters and downspouts and the importance of diverting water at least 5 feet away from the foundation.

• CALGreen § 301.1 Medium relevance — show source text

  301.1||||||||X||||||||||||||| |5.302.1 Definitions||||||||X||||||||||||||| |5.303.3.1||||||||X||||||||||||||| |5.303.3.2||||||||X||||||||||||||| |5.303.3.3||||||||X||||||||||||||| |5.303.3.4||||||||X||||||||||||||| |5.303.6||||||||X||||||||||||||| |5.304.6 and subsections||†||||||X|||||||||||||||

  The state agency does not adopt sections identified by the following symbol: †.

  2025 CALIFORNIA GREEN BUILDING STANDARDS CODE 5-17

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

  5-18 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE

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

  5 NONRESIDENTIAL MANDATORY MEASURES

  DIVISION 5.3 – WATER EFFICIENCY AND CONSERVATION

  SECTION 5.301—GENERAL

  5.301.1 Scope. The provisions of this chapter shall establish the means of conserving water used indoors, outdoors and in wastewater conveyance.

  SECTION 5.302—DEFINITIONS

  5.302.1 Definitions. The following terms are defined in Chapter 2. EVAPOTRANSPIRATION ADJUSTMENT FACTOR (ETAF).

  GRAYWATER.

  METERING FAUCET.

  MODEL WATER EFFICIENT LANDSCAPE ORDINANCE (MWELO).

  POTABLE WATER.

  SPECIAL LANDSCAPE AREA (SLA). [DSA-SS]

  SUBMETER.

  SECTION 5.303—INDOOR WATER USE

  5.303.1 Meters. Separate submeters or metering devices shall be installed for the uses described in Sections 5.303.1.1 and 5.303.1.2. 5.303.1.1 New buildings or additions in excess of 50,000 square feet. Separate submeters shall be installed as follows:

  1. For each individual leased, rented or other tenant space within the building projected to consume more than 100 gal/day (380 L/day), including, but not limited to, spaces used for laundry or cleaners, restaurant or food service, medical or dental office, laboratory, or beauty salon or barber shop.
  2. Where separate submeters for individual building tenants are unfeasible, for water supplied to the following subsystems: a. Makeup water for cooling towers where flow through is greater than 500 gpm (30 L/s). b. Makeup water for evaporative coolers greater than 6 gpm (0.04 L/s). c. Steam and hot-water boilers with energy input more than 500,000 Btu/h (147 kW). 5.303.1.2 Excess consumption. A separate submeter or metering device shall be provided for any tenant within a new building or within an addition that is projected to consume more than 1,000 gal/day.

  5.303.2 Reserved.