Section A5.303

INDOOR WATER USE

A5.303.2.3.1 Tier 1 – 12-percent savings. A schedule of plumbing fixtures and fixture fittings that will reduce the overall use of potable water within the building by 12 percent shall be provided. The reduction shall be based on the maximum allowable water use per plumb

ing fixture and fitting as required by the California Building Standards Code. The 12-percent reduction in potable water use shall be demonstrated by one of the following methods:

Prescriptive method. Each plumbing fixture and fitting shall not exceed the maximum flow rate at greater than or equal to 12-percent reduction as specified in Table A5.303.2.3.1; or
Performance method. A calculation demonstrating a 12-percent reduction in the building “water use baseline” as established in Table A5.303.2.2 shall be provided.

A5.303.2.3.2 Tier 2 – 20-percent savings. A schedule of plumbing fixtures and fixture fittings that will reduce the overall use of potable water within the building by 20 percent shall be provided. A calculation demonstrating a 20-percent reduction in the building “water use baseline” as established in Table A5.303.2.2 shall be provided.

A5.303.2.3.3 25-percent savings. A schedule of plumbing fixtures and fixture fittings that will reduce the overall use of potable water within the building by 25 percent shall be provided. A calculation demonstrating a 25-percent reduction in the building “water use baseline” as established in Table A5.303.2.2 shall be provided.

A5.303.2.3.4 Nonpotable water systems for indoor use. Utilizing nonpotable water systems (such as captured rainwater, treated graywater and recycled water) intended to supply water closets, urinals, and other allowed uses, may be used in the calculations demonstrating the 12-, 20- or 25-percent reduction. The nonpotable water systems shall comply with the current edition of the California Plumbing Code.

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NONRESIDENTIAL VOLUNTARY MEASURES

	TABLE A5.303.2.2 WATER USE BASELINE3
FIXTURE TYPE	BASELINE FLOW RATE	DURATION	DAILY USES	OCCUPANTS2
Showerheads	2.0 gpm @ 80 psi	5 min.	1	X2a
Lavatory faucets nonresidential	0.5 gpm @ 60 psi	.25 min.	3	X
Kitchen faucets	1.8 gpm @ 60 psi	4 min.	1	X2b
Replacement aerators	2 gpm @ 60 psi			X
Wash fountains	1.8 gpm/20 [rim space (in.) @ 60 psi]			X
Metering faucets	0.20 gallons/cycle	.25 min.	3	X
Metering faucets for wash fountains	0.20 gallons/cycle/20 [rim space (in.) @ 60 psi]	.25 min.	1 male1 3 female	X
Gravity tank type water closets	1.28 gallons/flush	1 flush	1 male1 3 female	X
Flushometer tank water closets	1.28 gallons/flush	1 flush	1 male1 3 female	X
Flushometer valve water closets	1.28 gallons/flush	1 flush	1 male1 3 female	X
Electromechanical hydraulic water closets	1.28 gallons/flush	1 flush	1 male1 3 female	X
Urinals	0.5 or 0.1254 gallons/flush	1 flush	2 male	X

The daily use number shall be increased to three if urinals are not installed in the room.
Refer to Table A, Chapter 4, 2019 California Plumbing Code, for occupant load factors. a. Shower use by occupants depends on the type of use of a building or portion of a building, e.g., total occupant load for a health club, but only a fraction of

the occupants in an office building as determined by the anticipated number of users. b. Kitchen faucet use is determined by the occupant load of the area served by the fixture. 3. Use worksheet WS-1 to calculate baseline water use. 4. Floor-mounted urinals @ 0.5 GPF or wall-mounted urinals @ 0.125 GPF.

	TABLE A5.303.2.3.1 FIXTURE FLOW RATES
FIXTURE TYPE	BASELINE FLOW RATE2	MAXIMUM FLOW RATE AT≥ 12 PERCENT REDUCTION
Showerheads	2.0 gpm @ 80 psi	1.8 gpm @ 80 psi
Lavatory faucets nonresidential3	0.5 gpm @ 60 psi	0.35 gpm @ 60 psi
Kitchen faucets3	1.8 gpm @ 60 psi	1.6 gpm @ 60 psi
Wash fountains	1.8 gallons/cycle/20 [rim space (in.) @ 60 psi]	1.6 gpm/20 [rim space (in.) @ 60 psi]
Metering faucets	0.20 gallons/cycle	0.18 gallons/cycle
Metering faucets for wash fountains	0.20 gallons/cycle/20 [rim space (in.) @ 60 psi]	0.18 gallons/cycle 20 [rim space (in.) @ 60 psi]
Gravity tank type water closets	1.28 gallons/flush	1.12 gallons/flush1
Flushometer tank water closets	1.28 gallons/flush	1.12 gallons/flush1
Flushometer valve water closets	1.28 gallons/flush	1.12 gallons/flush1
Electromechanical hydraulic water closets	1.28 gallons/flush	1.12 gallons/flush1
Urinals	0.5 or 0.1254 gallons/flush	0.44 or 0.11 gallons/flush

Includes water closets with an effective flush rate of 1.12 gallons or less when tested per ASME A 112.19.2 and ASME A 112.19.14.
See Table A5.503.2.2 for additional notes and references.
Where complying faucets are unavailable, aerators rated at 0.35 gpm or other means may be used to achieve reduction.
Floor-mounted urinals @ 0.5 GPF or wall-mounted urinals @ 0.125 GPF.

138 2019 CALIFORNIA GREEN BUILDING STANDARDS CODE

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A5.303.3 Appliances and fixtures for commercial applica- tion. Appliances and fixtures shall meet the following:

Clothes washers shall have a maximum Water Factor (WF) that will reduce the use of water by 10 percent below the California Energy Commissions’ WF standards for commercial clothes washers located in Title 20 of the California Code of Regulations.
Dishwashers shall meet the following water use standards:

a. Residential—ENERGY STAR.

i. Standard Dishwashers – 4.25 gallons per cycle.

ii. Compact Dishwashers – 3.5 gallons per cycle.

b. Commercial—Shall be in accordance with

ENERGY STAR requirements. Refer to Table A5.303.3.

Ice makers shall be air cooled.
Food steamers shall be connectionless or boilerless – and shall consume no more than 2 gallons of water per pan per hour, including condensate water, for batch type steamers, and no more than 5 gallons of water per pan per hour, including condensate water, for cook to order steamers.
The use and installation of water softeners that discharge to the community sewer system may be limited or prohibited by local agencies if certain conditions are met.
Combination ovens shall use a maximum of 1.5 gallons of water per hour per pan, including condensate water.
Commercial pre-rinse spray valves manufactured on or after January 1, 2006 shall function at equal to or less than 1.6 gpm (0.10 L/s) at 60 psi (414 kPa) and

a. Be capable of cleaning 60 plates in an average

time of not more than 30 seconds per plate.

b. Be equipped with an integral automatic shutoff.

c. Operate at static pressure of at least 30 psi (207

kPa) when designed for a flow rate of 1.3 gpm (0.08 L/s) or less.

Food waste pulping systems shall use no more than 2 gpm of potable water.

8.1. Note: potable water excludes on-site graywater use, such as dishwasher discharge water.

NONRESIDENTIAL VOLUNTARY MEASURES

A5.303.4 Water conserving plumbing fixtures and fittings.

A5.303.4.1 Nonwater supplied urinals. Nonwater supplied urinals are installed in accordance with the Califor- nia Plumbing Code .

Where approved, 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.