Landscape irrigation requirements and MWELO references for nonresidential sites

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

• CALGreen § 5.304.6 High 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)

  5-20 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE

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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 § 5.303.5 High 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 § 5-19 High relevance — show source text

  2025 CALIFORNIA GREEN BUILDING STANDARDS CODE 5-19

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  NONRESIDENTIAL MANDATORY MEASURES

  5.303.3.4.3 Wash fountains. Wash fountains shall have a maximum flow rate of not more than 1.8 gallons per minute/20 [rim space (inches) at 60 psi].

  5.303.3.4.4 Metering faucets. Metering faucets shall not deliver more than 0.20 gallons per cycle.

  5.303.3.4.5 Metering faucets for wash fountains. Metering faucets for wash fountains shall have a maximum flow rate of not more than 0.20 gallons per cycle/20 [rim space (inches) at 60 psi].

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

  5.303.3.4.6 Pre-rinse spray valve. When installed, commercial pre-rinse spray valves shall meet the requirements in the Cali- fornia Plumbing Code, Section 420.3.

  5.303.4 Commercial kitchen equipment.

  5.303.4.1 Food waste disposers. Disposers shall either modulate the use of water to no more than 1 gpm when the disposer is not in use (not actively grinding food waste/no-load) or shall automatically shut off after no more than 10 minutes of inactivity. Disposers shall use no more than 8 gpm of water.

  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.

• CALGreen § 301.1 Medium relevance — show source text

  Voluntary Measures 301.1, 306 Voluntary Tiers 304, 305, 306, A4.601, A5.601

  Water Resistance and Moisture Management 5.407, 5.505, A4.407, Appendix A6.1 (OSHPD) A5.407 Moisture control 4.505, 5.407.2, 5.505, Appendix A6.1 (OSHPD) A5.407.9, Appendix A6.1 (OSHPD) A5.505.2 Weather protection 5.407.1, A5.407.3

  Water Reuse Systems A4.305 Graywater A4.305.1, A5.304.8 Recycled water for landscape irrigation A4.305.3 Recycled water piping A4.305.2 Water Use, Indoor 4.303, 5.303, A4.303, A5.203

  Appliances A4.303.3, A5.303.3, Appendix A6.1 (OSHPD) A5.210 Dual plumbing A5.303.5 Fixture flow rates 4.303.1, Table A5.303.2.3.1, 5.303.2.3.1, A4.303 Kitchen faucets and dishwashers

  A4.303.1

  Meters 4.303.2, 5.303.1 Multiple showerheads serving one shower 4.303.1.3.2, 5.303.3.3.2 Nonwater urinals and waterless toilets

  A4.303.4, A5.303.4.1 Plumbing fixtures and fittings 4.303.1, 4.303.2, 5.303.3, 5.303.6 Tier 1, 12% savings; Tier 2, 20% savings; and 25% savings A5.303.2.1, A5.303.2.3.1, A5.303.2.3.2,

  A5.303.2.3.3

  Wastewater reduction 5.303.4

  Water Use Baseline Table A5.303.2.2

  Water Use, Outdoor 4.304, 5.304, A4.304, A5.304

  Graywater irrigation system A5.304.8 Low-water consumption irrigation system A4.304.1 Outdoor potable water meters A4.304.3, A5.304.2 Potable water elimination A4.304.2 Previously developed sites A5.304.7 Rainwater or stormwater collection systems A4.304.1 Restoration of areas disturbed by construction A5.304.6 Worksheet Baseline Water Use Chapter 8, (WS-1) 12%, 20% or 25% Reduction Water Use Calculation Table Chapter 8, (WS-2) Building Reuse Chapter 8, (WS-3) Whole Building Life Cycle Assessment 5.409.2, Chapter 8, (WS-4) Product GWP Compliance— Prescriptive Path 5.409.3, Chapter 8, (WS-5) Building Reuse Tier 1 and Tier 2 Chapter 8, (WS-6) Whole Building Life Cycle Assessment A5.409.2, Chapter 8, (WS-7) Product GWP Compliance— Prescriptive Path A5.409.3,

• CALGreen § 2.3 Medium relevance — show source text

  Landscape Irrigation Systems a. Provide narrative description of system—type, performance, water usage b. Describe reason for system selection—why chosen system is better than alternatives, issues such as performance, efficiency, reliability, flexibility, expandability, cost, owner preference, simplicity c. Sequence of Operation—operating schedules, setpoints d. Describe how system meets the OPR

  3. Water Reuse Systems a. Provide narrative description of system—type, performance, capacity, reuse purpose b. Describe reason for system selection—why chosen system is better than alternatives, issues such as performance, efficiency, reliability, flexibility, expandability, cost, owner preference, simplicity c. Sequence of Operation—operating schedules, setpoints d. Describe how system meets the OPR

  2.3 Enforcement:

  At their discretion, the building official confirms demonstrated compliance at Plan Intake by: a) Receipt of a copy of the BOD document, or b) Receipt of a form signed by the architect, engineer or designer of record, attesting that the BOD has been completed and meets the requirements of the OPR.

  Reference: 3 Commissioning measures shown in the construction documents

  CALGreen Section 5.410.2, Commissioning.

  This section provides details for element 3: Commissioning measures shown in the construction documents.

  3.1 Intent:

  Include commissioning measures or requirements in the construction documents (plans and specifications). Commissioning measures or requirements should be clear, detailed and complete to clarify the commissioning process.

  3.2 Compliance Method:

  Compliance is achieved by including commissioning requirements in the project specifications. The commissioning specifications should include the following:

  1. Primary (and optionally all) commissioning requirements are included in the general specification division (typically Division 1) and clear cross references of all commissioning requirements to and from the general division are included to ensure all subcontractors are held to them.

  2. A list of the systems and assemblies covered by the commissioning requirements.

  3. Roles and responsibilities of all parties, including: i. General contractor and subcontractors, vendors, construction manager ii. Commissioning provider lead

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  COMPLIANCE FORMS, WORKSHEETS AND REFERENCE MATERIAL

  iii. Owner, facility staff iv. Architect and design engineers v. Include the noncontractor parties in the construction specifications (information used only to provide the contractor with context for their work).

  vi. Include who writes checklists and tests, who reviews and approves test forms, who directs tests, who executes tests, who documents test results, and who approves completed tests. These roles may vary by system or assembly.

  4. Meeting requirements

  5. Commissioning schedule management procedures

  6. Issue and noncompliance management procedures

  7. Requirements for execution and documentation of installation, checkout and start up, including controls point-to-point checks and calibrations

  8. Specific testing requirements by system, including: i. Monitoring and trending ii. Opposite season or deferred testing requirements, functions and modes to be tested

  iii. Conditions of test

• CALGreen § 2.7 Medium relevance — show source text

  MERV Filter minimum efficiency reporting value.

  METERING FAUCET. A self-closing faucet that dispenses a specific volume of water for each actuation cycle. The volume or cycle duration can be fixed or adjustable.

  MODEL WATER EFFICIENT LANDSCAPE ORDINANCE (MWELO) [BSC-CG & DSA-SS] A California regulation commencing with Section 490 of Chapter 2.7, Division 2, Title 23, California Code of Regulations . The MWELO regulation establishes a structure for planning, designing, installing, maintaining and managing water efficient landscapes in new construction and rehabilitated projects.

  MODEL WATER EFFICIENT LANDSCAPE ORDINANCE (MWELO). [HCD] The California model ordinance (California Code of Regulations, Title 23, Division 2, Chapter 2.7), regulating landscape design, installation and maintenance practices. Local agencies are required to adopt the updated MWELO, or adopt a local ordinance at least as effective as the MWELO.

  2025 CALIFORNIA GREEN BUILDING STANDARDS CODE 2-7

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  DEFINITIONS

  MOISTURE CONTENT. The weight of the water in wood expressed in percentage of the weight of the oven-dry wood.

  MOUNTING HEIGHT (MH). The height of the photometric center of a luminaire above grade level.

  MULTI-OCCUPANT SPACES. Indoor spaces used for presentations and training, including classrooms and conference rooms.

  NEIGHBORHOOD ELECTRIC VEHICLE (NEV). [BSC-CG, DSA-SS] A motor vehicle that meets the definition of “low-speed vehicle” either in Section 385.5 of the Vehicle Code or in 49 CFR571.500 (as it existed on July 1, 2000), and is certified to zero-emission vehicle standards.

  NEWLY CONSTRUCTED (or NEW CONSTRUCTION). A newly constructed building (or new construction) does not include additions, alterations or repairs.

  NO ADDED FORMALDEHYDE (NAF) BASED RESINS. Resin formulated with no added formaldehyde as part of the resin cross linking structure for making hardwood plywood, particle board or medium density fiberboard. “No added formaldehyde resins” include, but are not limited to, resins made from soy, polyvinyl acetate or methylene diisocyanate. [BSC] See CCR, Title 17, Section 93120.1(a).

  NON-STORMWATER DISCHARGES. Discharges that do not originate from precipitation events. Including, but not limited to, dewatering activities, washout area discharge, vehicle and equipment cleaning, street cleaning and irrigation runoff.

  NONWATER URINAL WITH DRAIN CLEANSING ACTION. A nonwater urinal that conveys waste into the drainage system without the use of water for flushing and automatically performs a drain-cleansing action after a predetermined amount of time.

  OFF-STREET LOADING SPACES. [BSC-CG, DSA-SS] An area, other than a public street, public way or other property (and exclusive of off-street parking spaces), permanently reserved or set aside for the loading or unloading of motor vehicles, including ways of ingress and egress and maneuvering areas. Whenever the term “loading space” is used, it shall, unless the context clearly requires otherwise, be construed as meaning off-street loading space. This excludes designated passenger loading/unloading.

• CALGreen § 304.8 Medium relevance — show source text

  Exception: Area of the building footprint is excluded from the calculation.

  A5.304.8 Graywater irrigation system. Install a graywater collection system for onsite subsurface irrigation using graywater collected from bathtubs, showers, bathroom wash basins and laundry water. See California Plumbing Code.

  SECTION A5.305—WATER REUSE

  A5.305.1 Nonpotable water systems. Nonpotable water systems for indoor and outdoor use shall comply with the current edition of the California Plumbing Code.

  A5.305.2 Irrigation systems. Irrigation systems regulated by a local water efficient landscape ordinance or by the California Department of Water Resources Model Water Efficient Landscape Ordinance (MWELO) shall use recycled water.

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  APPENDIX A5-22 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE

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  CALIFORNIA GREEN BUILDING STANDARDS CODE – MATRIX ADOPTION TABLE

  APPENDIX A5 – NONRESIDENTIAL VOLUNTARY MEASURES

  DIVISION A5.4 – 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
  Chapter/Section

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  APPENDIX A5-24 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE

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  A5 NONRESIDENTIAL VOLUNTARY MEASURES

  DIVISION A5.4 – MATERIAL CONSERVATION AND RESOURCE EFFICIENCY

  SECTION A5.401—GENERAL

• CALGreen § 303.3 Medium relevance — show source text

  303.3** Install at least one qualified ENERGY STAR dishwasher or
  clothes washer.||
  |
  |
  |
  |
  | |A4.303.4Nonwater urinals or waterless toilets are installed.||||||| |A4.303.5One- and two-family dwellings shall be equipped with a
  demand hot water recirculation system.||||||| |Outdoor Water Use||||||| |4.304.1 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.||||||| |A4.304.1A rainwater capture, storage and re-use system is designed
  and installed.||||||| |A4.304.2A landscape design is installed, which does not utilize
  potable water.||||||| |A4.304.3 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.||||||| |Water Reuse Systems||||||| |A4.305.1Piping is installed to permit future use of a graywater
  irrigation system served by the clothes washer or other fixtures.||
  |
  |
  |
  |
  | |A4.305.2 Recycled water piping is installed.||
  |
  |
  |
  |
  | |A4.305.3Recycled water is used for landscape irrigation.||||||| |Innovative Concepts and Local Environmental Conditions||||||| |A4.306.1Items in this section are necessary to address innovative
  concepts or local environmental conditions.||||||| |Item 1|
  |
  |
  |
  |
  |
  | |Item 2|
  |
  |
  |
  |
  |
  | |Item 3|||||||

  APPENDIX A4-26 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE

• CALGreen § 303.4 Medium relevance — show source text

  APPENDIX A5 — NONRESIDENTIAL VOLUNTARY MEASURES

  A5.303.4 Water conserving plumbing fixtures and fittings.

  A5.303.4.1 Nonwater urinals. Nonwater urinals with drain cleansing action are installed in accordance with the California Plumbing Code .

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

  A5.303.5 Dual plumbing. New buildings and facilities shall be dual plumbed for potable and recycled water systems for toilet flushing when recycled water is available as determined by the enforcement authority.

  SECTION A5.304—OUTDOOR WATER USE

  A5.304.1 Reserved.

  A5.304.2 Outdoor water use. For new water service not subject to the provisions of Water Code Section 535, separate meters or submeters shall be installed for indoor and outdoor potable water use for landscaped areas of at least 500 square feet but not more than 1,000 square feet.

  A5.304.6 Restoration of areas disturbed by construction. Restore all landscape areas disturbed during construction by planting with local adaptive and/or noninvasive vegetation.

  A5.304.7 Previously developed sites. On previously developed or graded sites, restore or protect at least 50 percent of the site area with adaptive and/or noninvasive vegetation. Projects complying with Section A5.106.3, Item 3 may apply vegetated roof surface to this calculation if the roof plants meet the definition of adaptive and noninvasive.

  Exception: Area of the building footprint is excluded from the calculation.

  A5.304.8 Graywater irrigation system. Install a graywater collection system for onsite subsurface irrigation using graywater collected from bathtubs, showers, bathroom wash basins and laundry water. See California Plumbing Code.

  SECTION A5.305—WATER REUSE

  A5.305.1 Nonpotable water systems. Nonpotable water systems for indoor and outdoor use shall comply with the current edition of the California Plumbing Code.

  A5.305.2 Irrigation systems. Irrigation systems regulated by a local water efficient landscape ordinance or by the California Department of Water Resources Model Water Efficient Landscape Ordinance (MWELO) shall use recycled water.

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  APPENDIX A5-22 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE

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  CALIFORNIA GREEN BUILDING STANDARDS CODE – MATRIX ADOPTION TABLE

  APPENDIX A5 – NONRESIDENTIAL VOLUNTARY MEASURES

  DIVISION A5.4 – 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 § 8-24 Medium relevance — show source text

  acoustics and
  vibration|| |18|Degree of system integration, automation and functionality for controls (i.e. load shedding, demand response,
  energy management)|| ||BUILDING OCCUPANT AND O&M PERSONNEL EXPECTATIONS|| |19|Description of how the building will be operated and by whom|| |20|Level of training and orientation required to understand, operate and use the building systems for building
  operation and maintenance staff, as well as occupants|| |21|Building operation and maintenance staff location and capabilities|| ||COMMISSIONING AGENT INFORMATION|| |22|Name of commissioning agency:|| |23|Address of agency:|| |24|Contact person(s) name(s):||

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  COMPLIANCE FORMS, WORKSHEETS AND REFERENCE MATERIAL

  Owner/Owner’s Representative Acknowledgement

  Owner’s Project Requirements (OPR). The expectations and requirements of the building appropriate to its phase shall be documented before the design phase of the project begins. The OPR includes the elements listed above and they have been approved by the Owner or Owner’s Representative.

  Name: _______________________________  Owner  Owner’s Representative

  Company Name (if applicable): ________________________

  Signature: ________________________ Date: ___________

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  COMPLIANCE FORMS, WORKSHEETS AND REFERENCE MATERIAL

  BASIS OF DESIGN (BOD)

  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

• CALGreen § 15-11 Medium relevance — show source text

  are listed below||||||||X||||||||||||||| |Chapter/Section||||||||||||||||||||||| |WS-3||||||||X||||||||||||||| |WS-4||||||||X||||||||||||||| |WS-5||||||||X||||||||||||||| |WS-9||||||||X||||||||||||||| |IES TM-15-11 Table A-1||||||||X||||||||||||||| |Table 130.2-A||||||||X||||||||||||||| |Table 1302.2-B||||||||X|||||||||||||||

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  8 COMPLIANCE FORMS, WORKSHEETS AND REFERENCE MATERIAL

  [BSC] Sample forms found in “A Guide to the California Green Building Standards Code (Nonresidential)” located at https://www.dgs.ca.gov/BSC/Resources/Page-Content/Building-Standards-Commission-Resources-List-Folder/CALGreen may be used to assist in documenting compliance with the waste management plan and other provisions of this code.

  [HCD 1] Sample forms located at www.hcd.ca.gov/building-standards/calgreen/cal-green-forms.shtml may be used to assist in documenting compliance with CALGreen . WORKSHEET (WS-1) BASELINE WATER USE

  BASELINE WATER USE CALCULATION TABLE	Col2	Col3	Col4	Col5	Col6	Col7	Col8	Col9	Col10
  FIXTURE TYPE	FLOW RATE		DURATION		DAILY USES		OCCUPANTS1		GALLONS PER DAY
  Showerheads	1.8 gpm @ 80 psi	×	5 min.	×	1	×	Note 1a	=
  Lavatory faucets nonresidential	0.5 gpm @ 60 psi	×	.25 min.	×	3	×		=
  Kitchen faucets	1.8 gpm @ 60 psi	×	4 min.	×	1	×	Note 1b	=
  Replacement aerators	2.2 gpm	×		×		×		=
  Wash fountains	1.8 gpm/20 [rim space(in.)@ 60 psi]	×		×		×		=
  Metering faucets	0.20 gal/cycle	×		×	3	×		=
  Metering faucets for wash fountains	0.20 gal/cycle/20 [rim space(in.

• CALGreen § 0.0929 Medium relevance — show source text

  For SI units: 1 square foot = 0.0929 m [2], 1 gallon per day = 0.000043 L/s

  1504.4 Groundwater Level. No excavation for an irrigation field, disposal field, or mulch basin shall extend within 3 feet (914 mm) vertical of the highest known seasonal groundwater level, nor to a depth where gray water contaminates the groundwater or surface water. The applicant shall supply evidence of groundwater depth to the satisfaction of the Authority Having Jurisdiction.

  Note: The absence of groundwater in a test hole three (3) vertical feet (915 mm) below the deepest irrigation or dis- posal point shall be sufficient to satisfy this section unless seasonal high groundwater levels have been documented to rise to within this area.

  1504.5 Irrigation, Disposal Field and Mulch Basin Construction. Irrigation fields, disposal fields and mulch basins used in gray water systems shall comply with this sec- tion. Gray water systems may contain either an irrigation field or a disposal field or a combination of both. This section is not intended to prevent the use of other methods of gray water irrigation or disposal approved by the Enforcing Agency.

  TABLE 1504.2

  DESIGN OF SIX TYPICAL SOILS

  For SI units: 1 square foot = 0.0929 m [2], 1 gallon per day = 0.000043 L/s

  316 2025 CALIFORNIA PLUMBING CODE

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

  ALTERNATE WATER SOURCES FOR NONPOTABLE APPLICATIONS

  [BSC-CG] Irrigation design shall be verified in accor- dance with the California Green Building Standards Code (CALGreen), Chapter 5, Division 5.3.

  [HCD 1] Irrigation design shall be verified in accor- dance with the California Green Building Standards Code (CALGreen), Chapter 4, Division 4.3.

  1504.5.1 Mulch Basin. A mulch basin may be used as an irrigation or disposal field. Mulch basins shall be sized in accordance with Table 1504.2 and of sufficient depth, length and width to prevent ponding or runoff dur- ing the gray water surge of a clothes washer, bathtub or shower. Mulch must be replenished as required due to decomposition of organic matter. Mulch basins will require periodic maintenance, reshaping or removal of dirt to maintain surge capacity and to accommodate plant growth and prevent ponding or runoff.

  1504.5.2 Irrigation Field. The provisions of this sec- tion are not intended to prevent the use of any appropri- ate material, appliance, installation, device, design or method of construction. If an alternate design is not available, the following provisions may be used as guid- ance in the design of a gray water irrigation field: