A4.602 RESIDENTIAL OCCUPANCIES APPLICATION CHECKLIST—continued — 2025 California Green Building Standards Code
California Green Building Standards Code (Title 24, Part 11) · 2025 edition · updated 2026-10-19 · California
Cite as: 2025 California Green Building Standards Code (Title 24, Part 11) § A4.602 · Effective January 1, 2026 · Official source: Building Standards Commission
| FEATURE OR MEASURE | LEVELS APPLICANT TO SELECT ELECTIVE MEASURES |
VERIFICATIONS ENFORCING AGENCY TO SPECIFY VERIFICATION METHOD |
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| FEATURE OR MEASURE | Mandatory | Prerequisites and electives1 | Prerequisites and electives1 | Enforcing Agency All |
Installer or Designer All |
Third party All |
| FEATURE OR MEASURE | Mandatory | Tier 1 | Tier 2 | Tier 2 | Tier 2 | Tier 2 |
| WATER EFFICIENCY AND CONSERVATION | ||||||
| Indoor Water Use | ||||||
| 4.303.1Plumbing fixtures (water closets and urinals) and fittings (showerheads, faucets and pre-rinse spray valves) installed in residential buildings shall comply with the prescriptive requirements of Sections 4.303.1.1 through 4.303.1.4.5. |
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| 4.303.2 Submeters for multifamily building and dwelling units in mixed-use residential/ installed to measure water usage of individual rental dwelling units in accordance with the_California Plumbing Code._ |
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| 4.303.3Plumbing fixtures and fittings required in Section 4.303.1 shall be installed in accordance with the_California Plumbing Code,_ and shall meet the applicable referenced standards. |
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| A4.303.1The 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. |
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| 4.303.1.4.3 Metering faucets in residential buildings shall not deliver more than 0.2 gallons per cycle. |
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| A4.303.2Alternate water source 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._ |
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| A4.303.3 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. |
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| 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. |
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| A4.304.1A rainwater capture, storage and re-use system is designed and installed. |
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| A4.304.2A landscape design is installed, which does not utilize potable water. |
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| 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. |
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| 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. |
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| Item 2 | ~~~~ |
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| Item 3 | ~~~~ | ~~~~ | ~~~~ | ~~~~ | ~~~~ | ~~~~ |
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