CALGreen · California Green Building Standards Code (CALGreen)
What are the mandatory requirements for landscape irrigation and on‑site water reuse?
If your building has irrigation or onsite water reuse systems, CALGreen **§ 4.410.1** requires you to provide, at final inspection, an operation & maintenance manual that includes clear, system‑specific operation and maintenance instructions for those systems and a statement that the manual remains with the building.
Last reviewed: July 6, 2026
What the code requires — plain English
The California Green Building Standards Code requires that, at final inspection, an Operation and maintenance manual containing specific, system‑level operation and maintenance instructions for landscape irrigation systems and water reuse systems be placed in the building and remain with it. The controlling provision is § 4.410.1.
The single most important rule: at final inspection you must provide an O&M manual that includes clear operation and maintenance instructions for the building’s landscape irrigation and on‑site water reuse systems, and that manual must remain with the building. § 4.410.1
Requirements in detail
The mandatory obligations in § 4.410.1 are narrowly focused on documentation delivered and available at final inspection. Key, defined items from the section you must include in the O&M manual are:
- Directions to the owner or occupant that the manual shall remain with the building (the manual is a permanent record). § 4.410.1(1)
- Operation and maintenance instructions for major systems, specifically calling out:
- Landscape irrigation systems. § 4.410.1(2)(d)
- Water reuse systems. § 4.410.1(2)(e)
- Information about water‑conserving landscape and irrigation design and controllers which conserve water (educational / design reference material included in the manual). § 4.410.1(6)
- Related items to include in the manual (helpful to compliance): roof/yard drainage and instructions for maintaining gutters/downspouts (see § 4.410.1(2)(b) and § 4.410.1(7)). § 4.410.1(2)(b), (7)
Decision‑relevant table
| Requirement element | What must be provided (brief) | When / who | Code reference |
|---|---|---|---|
| Manual retention statement | Directions that the manual shall remain with the building | Delivered at final inspection; owner/occupant responsible to keep | § 4.410.1(1) |
| Irrigation O&M instructions | Operating sequences, maintenance tasks, controls overview for landscape irrigation systems | Included in O&M manual at final inspection | § 4.410.1(2)(d) |
| Water reuse O&M instructions | System description, operation, maintenance for water reuse systems (e.g., reclaimed/graywater/rainwater systems used onsite) | Included in O&M manual at final inspection | § 4.410.1(2)(e) |
| Water‑conserving design info | Information about water‑conserving landscape and controllers that conserve water | Included in O&M manual at final inspection | § 4.410.1(6) |
| Related drainage and gutter instructions | Instructions for gutters, downspouts and diverting water away from foundation | Included in O&M manual at final inspection | § 4.410.1(2)(b), (7) |
Note: § 4.410.1 requires inclusion of these items in the manual — it does not by itself set technical irrigation design or metering thresholds (those are addressed elsewhere in CALGreen and referenced codes).
Exceptions & special cases
- § 4.410.1 itself contains no express exceptions for exclusion of irrigation or reuse documentation — if the building has those systems, the O&M manual must include them. § 4.410.1
- The section is about documentation and O&M delivery at final inspection; it does not replace or restate technical design or permitting obligations found in other sections (for example, rainwater capture, potable‑water elimination, separate outdoor meters, graywater/recycled water piping and use are addressed elsewhere in CALGreen appendices and the California Plumbing Code). See Related provisions below for those specifics. file
If you need to confirm technical sizing, dual‑plumb requirements, or irrigation controller specifications, those are not mandated by § 4.410.1 and must be checked in the applicable CALGreen sections and the California Plumbing Code cited in CALGreen.
Common mistakes
- Treating § 4.410.1 as a technical design requirement instead of a documentation requirement — it mandates the O&M manual content, not how to size irrigation pipes or treatment systems. § 4.410.1
- Failing to include explicit, system‑level operation and maintenance instructions for the irrigation or water reuse systems (a generic “systems present” note is insufficient). § 4.410.1(2)(d),(e)
- Delivering the manual after final inspection or not leaving a copy in the building. The manual must be placed in the building at final inspection and include directions that it remain with the building. § 4.410.1(1)
- Omitting information about water‑conserving controllers and design (this is explicitly required to be included as informational material). § 4.410.1(6)
Worked example — concrete scenario
Scenario: A 48‑unit multifamily building has an automatic landscape irrigation system (6 zones, weather‑based controller, rain sensor) and a graywater capture system that reuses laundry water for subsurface irrigation.
What you must do to comply with § 4.410.1:
- Prepare an Operation and maintenance manual and place one copy in the building at final inspection. The manual must include the directions that it remain with the building. § 4.410.1(1)
- In the manual include system‑specific O&M sections:
- For the irrigation system: zone map, controller programming (peak schedule and sensor integration), weekly/seasonal maintenance checklist (filters, nozzles), and troubleshooting steps. This satisfies the requirement for operation and maintenance instructions for landscape irrigation systems. § 4.410.1(2)(d)
- For the graywater reuse system: schematic, permitted uses, flushing/filtration maintenance intervals, and operator contact information. This satisfies the water reuse systems instruction requirement. § 4.410.1(2)(e)
- Add an informational section describing the water‑conserving controller features (weather‑based scheduling, rain‑suspend) and how to use them to maximize water savings. § 4.410.1(6)
Result: at final inspection the building official finds the manual in the building and verifies it includes the required irrigation and reuse O&M instructions — this meets the mandatory content of § 4.410.1.
Related provisions (select CALGreen & referenced code sections)
- § 4.410.1 — Operation and maintenance manual (controlling section for O&M content).
- § 4.304.1 / Appendix A4.304.1 — Rainwater catchment and residential outdoor water‑use provisions (potable elimination and capture) — technical requirements for outdoor water reuse and rainwater systems.
- A4.305.1–A4.305.3 — Graywater and recycled water piping and reuse for landscape irrigation (residential voluntary measures that specify graywater collection piping and recycled water use). file
- California Plumbing Code — Detailed graywater/mulch basin and irrigation field design rules and irrigation control requirements cited by CALGreen. (See graywater and irrigation sections in the CPC.) file
- § 5.410.4 — Testing and adjusting includes landscape irrigation systems and water reuse systems in systems‑testing plans for nonresidential commissioning/testing. Useful cross‑reference for verification and commissioning work.
- § 5.410.2 and related commissioning/BOD/system manual guidance — describes the systems manual and commissioning content for larger nonresidential buildings (useful if your project is nonresidential). file
If you need the specific technical requirements for irrigation controller types, meter thresholds, recycled water piping or graywater installation standards, those requirements are located in the sections and referenced codes above; § 4.410.1 itself prescribes the required documentation content but not the detailed engineering specifications. file
Code references
Grounded in the retrieved California Green Building Standards Code (CALGreen) — click a citation to read the verbatim passage:
CALGreen § 303.5 High relevance — show source text
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:
- Use of captured rainwater.
- Use of recycled water.
- Water treated for irrigation purposes and conveyed by a water district or public entity.
- Use of graywater.
- 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.
SECTION A4.305 —WATER REUSE SYSTEMS
A4.305.1 Graywater. Alternative plumbing piping is installed to permit the discharge from the clothes washer or other fixtures to be used for an irrigation system in compliance with the California Plumbing Code.
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:
- Interior piping for the use of recycled water is installed to serve all water closets, urinals and floor drains.
- 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
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
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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CALGreen § 5.410.2.5 High relevance — show source text
4**
Material
Conservation
and Resource
Efficiency|Mandatory|Documentation and training [N]|5.410.2.5||||| |(continued)
DIVISION 5.4
Material
Conservation
and Resource
Efficiency|Mandatory|Systems manual [N]|5.410.2.5.1||||| |(continued)
DIVISION 5.4
Material
Conservation
and Resource
Efficiency|Mandatory|Systems operation training [N]|5.410.2.5.2||||| |(continued)
DIVISION 5.4
Material
Conservation
and Resource
Efficiency|Mandatory|Commissioning report [N]|5.410.2.6||||| |(continued)
DIVISION 5.4
Material
Conservation
and Resource
Efficiency|Mandatory|Testing and adjusting for new buildings < 10,000 sf or
new systems that serve additions or alterations [A]|5.410.4||||| |(continued)
DIVISION 5.4
Material
Conservation
and Resource
Efficiency|Mandatory|System testing plan for renewable energy, landscape
irrigation and water reuse [A]|5.410.4.2||||| |(continued)
DIVISION 5.4
Material
Conservation
and Resource
Efficiency|Mandatory|Procedures for testing and adjusting|5.410.4.3||||| |(continued)
DIVISION 5.4
Material
Conservation
and Resource
Efficiency|Mandatory|Procedures for HVAC balancing|5.410.4.3.1||||| |(continued)
DIVISION 5.4
Material
Conservation
and Resource
Efficiency|Mandatory|Reporting for testing and adjusting|5.410.4.4||||| |(continued)
DIVISION 5.4
Material
Conservation
and Resource
Efficiency|Mandatory|Operation and maintenance (O&M) manual|5.410.4.5||||| |(continued)
DIVISION 5.4
Material
Conservation
and Resource
Efficiency|Mandatory|Inspection and reports|5.410.4.5.1||||| |DIVISION 5.5
Environmental
Quality
(continued)|Mandatory|Fireplaces|5.503.1||||| |DIVISION 5.5
Environmental
Quality
(continued)|Mandatory|Woodstoves|5.503.1.1||||| |DIVISION 5.5
Environmental
Quality
(continued)|Mandatory|Temporary ventilation|5.504.CALGreen § 410.2 High relevance — show source text
410.2||||| |DIVISION 5.4
Material
Conservation
and Resource
Efficiency
(continued)|Mandatory|Owner’s or owner representative’s Project Requirements
(OPR) [N]|5.410.2.1||||| |DIVISION 5.4
Material
Conservation
and Resource
Efficiency
(continued)|Mandatory|Basis of Design (BOD) [N]|5.410.2.2|||||2025 CALIFORNIA GREEN BUILDING STANDARDS CODE APPENDIX A5-45
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APPENDIX A5 — NONRESIDENTIAL VOLUNTARY MEASURES
CHAPTER 5
DIVISIONSCol2 SECTION TITLE CODE
SECTIONY N/A O PLAN SHEET,
SPEC OR
ATTACH(continued)
DIVISION 5.4
Material
Conservation
and Resource
EfficiencyMandatory Commissioning plan [N] 5.410.2.3 (continued)
DIVISION 5.4
Material
Conservation
and Resource
EfficiencyMandatory Functional performance testing [N] 5.410.2.4 (continued)
DIVISION 5.4
Material
Conservation
and Resource
EfficiencyMandatory Documentation and training [N] 5.410.2.5 (continued)
DIVISION 5.4
Material
Conservation
and Resource
EfficiencyMandatory Systems manual [N] 5.410.2.5.1 (continued)
DIVISION 5.4
Material
Conservation
and Resource
EfficiencyMandatory Systems operation training [N] 5.410.2.5.2 (continued)
DIVISION 5.4
Material
Conservation
and Resource
EfficiencyMandatory Commissioning report [N] 5.410.2.6 (continued)
DIVISION 5.4
Material
Conservation
and Resource
EfficiencyMandatory Testing and adjusting for new buildings < 10,000 sf or
new systems that serve additions or alterations [A]5.410.4 (continued)
DIVISION 5.4
Material
Conservation
and Resource
EfficiencyMandatory System testing plan for renewable energy, landscape
irrigation and water reuse [A]5.410.4.2 (continued)
**DIVISION 5.CALGreen § 5.410.2.2 High 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
8-26 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE
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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 § 411.12 High relevance — show source text
Exception: Landscape features outside of the public right of way such as paved walkways, jogging paths, and golf cart paths, are exempted from this requirement where run off drains into the same hydrozone without puddling. L 411.12 Narrow or Irregularly Shaped Landscape Areas. Narrow or irregularly shaped landscape areas, less than 4 feet (1219 mm) in any direction across opposing boundaries, shall not be irrigated by an irrigation emission device except low flow emitters with flow rates not to exceed 6.3 gallons (24 L) per hour. L 411.13 Irrigation System Inspection and Perform- ance Check. The irrigation system shall be inspected to verify compliance with the irrigation design in accordance with the following:
(1) Inspection and performance check shall be by an independent third party having credentials in accordance with the US EPA WaterSense program or the Authority Having Jurisdiction.
(2) Sprinklers shall be installed as specified with proper spacing and required nozzle.
(3) Sprinklers shall be activated and visually inspected for covering areas without causing overspray or runoff.
(4) Valves shall be installed as specified.
(5) Drip irrigation systems shall be inspected to verify the proper valve, pressure regulation, filtering device, location of flush valves, and that the installed emitters comply with the irrigation plan.
(6) Control system shall be installed as specified and listed as a US EPA WaterSense labeled controller, and all sensors shall be installed and verified for proper installation and operation.
(7) The peak demand irrigation schedule shall be posted near the controller, or the scheduling parameters for the controller shall be listed for each station including cycle and soak times.
(8) Record drawings of the irrigation system shall be completed and provided for the irrigation inspection.
(9) An inspection report shall be provided to the property owner or management company identifying problems and what corrective actions are required.
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L 411.7 Irrigation Control Systems. Where installed as part of a landscape irrigation system, irrigation control systems shall:
(1) Automatically adjust the irrigation schedule to respond to plant water needs determined by weather or soil moisture conditions. Shall be listed to the EPA WaterSense Specification for Weather-Based Irrigation Controllers or the EPA WaterSense Specification for Soil MoistureBased Irrigation Controllers. (2) Utilize onsite sensors or remote weather data to inhibit or to suspend irrigation when adequate soil moisture is present or during a rainfall or freezing conditions. (3) Utilize either one or more on-site sensors or a weather based irrigation controller listed to the US EPA WaterSense Weather Based Irrigation Controllers Specification to suspend irrigation where adequate soil moisture is present for plant growth. (4) Have the capability to program multiple and different run times for each irrigation zone to enable cycling of water applications and durations to mitigate water flowing off of the intended irrigation zone. (5) Be capable of indicating to the user when it is not receiving a signal or local sensor input. (6) Be capable of allowing for a manual operation troubleshooting test cycle and shall automatically return to sensor input mode within some period of time as designated by the manufacturer, even when the switch is still positioned for manual operation. (7) The site-specific settings of the irrigation control system shall be posted at the control system location. 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.
CALGreen § 5704.3.6.3 High relevance — show source text
a. System shall be a closed-head wet system with approved devices for proportioning aqueous film-forming foam. b. Except as modified herein, in-rack sprinklers shall be installed in accordance with NFPA 13. c. The height of storage shall not exceed 25 feet. d. Hose stream demand includes 11/-inch inside hose connections, where required. 2| |---|---|---|---|---|---| |TABLE 5704.3.6.3(7)—AUTOMATIC AFFF WATER PROTECTION REQUIREMENTS FOR RACK STORAGE OF LIQUIDS IN METAL CONTAINERS GREATER THAN 5-GALLON CAPACITYa, b|DURATION
AFFF SUPPLY
(minimum)|DURATION
AFFF SUPPLY
(minimum)|DURATION
AFFF SUPPLY
(minimum)|15|15| |TABLE 5704.3.6.3(7)—AUTOMATIC AFFF WATER PROTECTION REQUIREMENTS FOR RACK STORAGE OF LIQUIDS IN METAL CONTAINERS GREATER THAN 5-GALLON CAPACITYa, b|IN-RACK SPRINKLER ARRANGEMENT AND DEMANDc|Hose stream
demandd
(gpm)|Hose stream
demandd
(gpm)|500|500| |TABLE 5704.3.6.3(7)—AUTOMATIC AFFF WATER PROTECTION REQUIREMENTS FOR RACK STORAGE OF LIQUIDS IN METAL CONTAINERS GREATER THAN 5-GALLON CAPACITYa, b|IN-RACK SPRINKLER ARRANGEMENT AND DEMANDc|Number of
sprinklers
operating|Number of
sprinklers
operating|Three
sprinklers
per level|Three
sprinklers
per level| |TABLE 5704.3.6.3(7)—AUTOMATIC AFFF WATER PROTECTION REQUIREMENTS FOR RACK STORAGE OF LIQUIDS IN METAL CONTAINERS GREATER THAN 5-GALLON CAPACITYa, b|IN-RACK SPRINKLER ARRANGEMENT AND DEMANDc|Minimum
nozzle
pressure
(psi)|Minimum
nozzle
pressure
(psi)|30|30| |TABLE 5704.3.6.3(7)—AUTOMATIC AFFF WATER PROTECTION REQUIREMENTS FOR RACK STORAGE OF LIQUIDS IN METAL CONTAINERS GREATER THAN 5-GALLON CAPACITYa, b|IN-RACK SPRINKLER ARRANGEMENT AND DEMANDc|On-end storage of drumson
pallets, up to 25 feet|On-end storage of drumson
pallets, up to 25 feet|1.
Ordinary temperature
sprinkler up to 10 feet apart
horizontally
2.
One line sprinklers above
each level of storage
3.
Locate in longitudinal flue
space, staggered vertically
4.
Shields required for multiple-
level|1.
Ordinary temperature
sprinkler up to 10 feet apart
horizontally
2.CALGreen § 303.3 High relevance — show source text
303.3** Install at least one qualified ENERGY STAR dishwasher or
clothes washer.||
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| |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.||
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| |A4.305.2 Recycled water piping is installed.||
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| |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|
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CALGreen § 2.2. High relevance — show source text
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
8-26 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE
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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: _____________________________
ITEM # BOD ITEMS PAGE NUMBER IN
BOD DOCUMENTRENEWABLE ENERGY SYSTEMS (IF ANY) 1 Narrative description of system (i.e., system type(s), location, inverter type, control type, performance,
efficiency, energy savings, payback period, other)2 Description of how the system meets requirements listed in OPR 3 Reasons for system selection, as opposed to alternatives (e.g., performance, efficiency, reliability, flexibility,
simplicity, expandability, cost, payback period, etc.)4 Renewable energy system generation calculations: sizing calculation method, assumptions and results LANDSCAPE IRRIGATION SYSTEMS 5 Narrative description of system (i.e. system type(s), location, control type, performance, efficiency, water
savings, other)6 Description of how the system meets requirements in OPR 7 Reasons for system selection, as opposed to alternatives (e.g., performance, efficiency, reliability, flexibility,
cost, utility company incentives, etc.)8 Landscape irrigation system calculations: sizing calculation method, assumptions and results WATER REUSE SYSTEM (IF ANY) 11 Narrative description of system (i.e., system type(s), location, space requirements, equipment requirements,
control type, performance, efficiency, potable water savings, payback period, other)12 Description of how the system meets requirements in OPR 13 Reasons for system selection, as opposed to alternatives (e.g., performance, efficiency, reliability, flexibility,
simplicity, cost, payback period, etc.)14 Water reuse system calculations: sizing calculation method, assumptions and results CALGreen § 2.3 High 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
- 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:
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.
A list of the systems and assemblies covered by the commissioning requirements.
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.
Meeting requirements
Commissioning schedule management procedures
Issue and noncompliance management procedures
Requirements for execution and documentation of installation, checkout and start up, including controls point-to-point checks and calibrations
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 § 8-27 Medium relevance — show source text
ITEM # BOD ITEMS PAGE NUMBER IN
BOD DOCUMENTRENEWABLE ENERGY SYSTEMS (IF ANY) 1 Narrative description of system (i.e., system type(s), location, inverter type, control type, performance,
efficiency, energy savings, payback period, other)2 Description of how the system meets requirements listed in OPR 3 Reasons for system selection, as opposed to alternatives (e.g., performance, efficiency, reliability, flexibility,
simplicity, expandability, cost, payback period, etc.)4 Renewable energy system generation calculations: sizing calculation method, assumptions and results LANDSCAPE IRRIGATION SYSTEMS 5 Narrative description of system (i.e. system type(s), location, control type, performance, efficiency, water
savings, other)6 Description of how the system meets requirements in OPR 7 Reasons for system selection, as opposed to alternatives (e.g., performance, efficiency, reliability, flexibility,
cost, utility company incentives, etc.)8 Landscape irrigation system calculations: sizing calculation method, assumptions and results WATER REUSE SYSTEM (IF ANY) 11 Narrative description of system (i.e., system type(s), location, space requirements, equipment requirements,
control type, performance, efficiency, potable water savings, payback period, other)12 Description of how the system meets requirements in OPR 13 Reasons for system selection, as opposed to alternatives (e.g., performance, efficiency, reliability, flexibility,
simplicity, cost, payback period, etc.)14 Water reuse system calculations: sizing calculation method, assumptions and results Architect/Engineer/Designer Acknowledgement
I hereby acknowledge the Basis of Design (BOD) document has been completed and meets the Owner’s Project Requirements (OPR).Col2 Col3 Col4 Col5 Name License Number Signature Date Architect of Record Landscape Architect Renewable Energy System Designer Other (specify): Commissioning Agent Acknowledgment
I have reviewed the Basis of Design (BOD) and verified that it meets the Owner’s Project Requirements (OPR):
Name: _____________________________________________
Company Name (if applicable): ____________________________________________
Agent’s Signature: __________________________________ Date: ___________
2025 CALIFORNIA GREEN BUILDING STANDARDS CODE 8-27
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
COMPLIANCE FORMS, WORKSHEETS AND REFERENCE MATERIAL
Cx MEASURES IN CONSTRUCTION DOCUMENTS
COMPLIANCE FORM
The following form may be required to be printed on the permit set of construction drawings or submitted separately.
CALGreen Commissioning Requirement 5.410.2, Commissioning Measures in the Construction Documents
5.410.2. Commissioning measures shall be shown in the construction documents.
The commissioning measures shown in the construction documents include the checked elements listed below and have been approved by the owner, owner’s representative or designer of record.
Col1 COMMISSIONING MEASURE ELEMENTS1 INCLUDED 1. CALGreen § 4.409 Medium relevance — show source text
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:
Directions to the owner or occupant that the manual shall remain with the building throughout the life cycle of the structure.
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.
- Information on required routine maintenance measures, including, but not limited to, caulking, painting, grading around the building, etc.
- Information about state solar energy and incentive programs available.
- A copy of all special inspection verifications required by the enforcing agency or this code.
- Information from the Department of Forestry and Fire Protection on maintenance of defensible space around residential
structures.
- Information and/or drawings identifying the location of grab bar reinforcements.
4.410.2 Recycling by occupants. Where 5 or more multifamily dwelling units are constructed on a building site, provide readily accessible area(s) that serves all buildings on the site and are identified for the depositing, storage and collection of nonhazardous materials for recycling, including (at a minimum) paper, corrugated cardboard, glass, plastics, organic waste and metals, or meet a lawfully enacted local recycling ordinance, if more restrictive.
Exception: Rural jurisdictions that meet and apply for the exemption in Public Resources Code Section 42649.82 (a)(2)(A) et seq. are not required to comply with the organic waste portion of this section.
4-12 2025 CALIFORNIA GREEN BUILDING STANDARDS CODE
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4 RESIDENTIAL MANDATORY MEASURES
DIVISION 4.5 – ENVIRONMENTAL QUALITY
SECTION 4.501—GENERAL
4.501.1 Scope. The provisions of this chapter shall outline means of reducing the quantity of air contaminants that are odorous, irritating and/or harmful to the comfort and well- being of a building’s installers, occupants and neighbors.
SECTION 4.502—DEFINITIONS
4.502.1 Definitions. The following terms are defined in Chapter 2.
AGRIFIBER PRODUCTS.
COMPOSITE WOOD PRODUCTS.
DIRECT-VENT APPLIANCE.
MAXIMUM INCREMENTAL REACTIVITY (MIR).
MOISTURE CONTENT.
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
on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.
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:
- 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.
- 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:
Directions to the owner or occupant that the manual shall remain with the building throughout the life cycle of the structure.
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.
Frequently asked questions
What exactly must be in the manual for irrigation systems?
You must include operation and maintenance instructions for the landscape irrigation system — e.g., system description, controls overview, maintenance and troubleshooting instructions — and these must be placed in the building at final inspection per § 4.410.1(2)(d).
Does § 4.410.1 require installation of graywater or recycled‑water systems?
No. § 4.410.1 requires that if such systems exist, the O&M manual include operation and maintenance instructions for them. Separate CALGreen appendices and the California Plumbing Code address installation and technical requirements. file
When must the O&M manual be delivered?
The manual (or acceptable electronic media) must be placed in the building at the time of final inspection and must include directions that it remain with the building, per § 4.410.1(1).
Is information about controllers required?
Yes — § 4.410.1(6) specifically requires information about water‑conserving landscape and irrigation design and controllers which conserve water to be included in the manual.
If my project is nonresidential, is there additional commissioning guidance?
Yes — nonresidential requirements for systems manuals, testing and commissioning (including landscape irrigation and water reuse systems) are in Chapter 5 (for example § 5.410.2 and § 5.410.4). Use those for detailed commissioning and testing plans. file
More in California Green Building Standards Code (CALGreen)
- Administration (Chapter 1)
- Nonresidential Voluntary Measures (Appendix A5 — divisions A5.1–A5.6, electives & verification)
- Residential Mandatory Measures — Planning & Design; Energy; Water; Materials; Environmental Quality (Chapter 4)
- Definitions (Chapter 2)
- Voluntary Standards for Health Facilities (Appendix A6 / OSHPD guidance)
- Green Building – scope, mixed occupancies, phased projects (Chapter 3)
- Residential Voluntary Measures (Appendix A4 — divisions A4.1–A4.6, tiers & model ordinance)
- Nonresidential Mandatory Measures — Planning & Design; Energy; Water; Materials; Environmental Quality (Chapter 5)
- Compliance verification, construction documents & checklists (Section 102, Chapter 7, Appendix checklists)
- Referenced Organizations and Standards (Chapter 6)
- Voluntary Tiers and CALGreen Tier 1 / Tier 2 (performance tiers, thresholds)
- Installer and Special Inspector Qualifications (Chapter 7)
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