WE P1.0 Indoor Potable Water Use Reduction
WE C1.1 Enhanced Indoor Potable Water Use Reduction
WE P2.0 Outdoor Water Use Reduction
WE C2.1 Enhanced Outdoor Water Use Reduction
WE C3.1 Irrigation Systems Commissioning


WE P1.0    INDOOR POTABLE WATER USE REDUCTION

PREREQUISITE

APPLICABILITY: All Projects

WE P1.0        REQUIREMENTS

This prerequisite is prescriptive; no calculations are needed. All indoor water fixtures listed in Table WE 1-1: Fixture Performance Requirements must comply with the listed maximum water consumption figures. These requirements are not averages–every fixture must comply.

Table WE 1-1: Fixture Performance Requirements

Fixture/Fitting Type

Maximum Water

Consumption

Other Requirements & Notes

Showerheads

 

 

 

 

 

 

2.0 gpm @ 80 psi

Must be WaterSense labeled.

Commercial lavatory faucets

0.5 gpm @ 60 psi

Source: Section 5.4.1 and Table 1 of ASME A112.18.1/CSA B125.1–Plumbing Supply Fittings

Metering faucets (self-closing)

0.20 gallons/cycle @ 60 psi

Source: CALGreen 5.303.3.3.4

There is no WaterSense standard.

Kitchen faucets

2.2 gpm

No WaterSense standard.

Water closets

1.28 gallons/flush

 

Tank-type and flushometer water closets must be WaterSense labeled.

Urinals

0.5 gallons/flush

Flushing urinals must  be WaterSense labeled.

Commercial pre-rinse spray valves

1.3 gpm @ 60 psi

No WaterSense standard.


WE C1.1    ENHANCED INDOOR POTABLE WATER USE REDUCTION

CREDIT

APPLICABILITY: All Projects, see Implementation for specifics.

WE C1.1        REQUIREMENTS

WE C1.1.1        Calculated Water Savings

Reduce potable water consumption beyond the savings achieved in WE P1.0 per the following thresholds. Use any combination of high efficiency fixtures and appliances in Table WE 1-2, water shut-off, or site-collected water. Points will be awarded based on total calculation of percentage reduced. Percentages between thresholds are implied.

  • 20% (2 points)
  • 25% (3 points)
  • 30% (4 points)
  • 35% (5 points)

Table WE 1-2: Enhanced Fixture Performance Targets*

Fixture/Fitting Type

Target Maximum Water

Consumption

Showerheads

1.5 gpm @ 80 psi

Water closets – flush valve

1.1 gallons/flush

Urinals

0.125 gallons/flush

Commercial pre-rinse spray valves

1.15 gpm @ 60 psi

Commercial washing machines

Must meet ENERGY STAR (<=4.0 gpc/ft3)

*Not exclusive. Any fixture with a higher efficiency than in WE P1.0 is acceptable. Note that faucets lower than .5 gpm, while available on the market, have not been proven viable for handwashing.

Additional options:

  1. Provide shut-off capabilities for water supply to all urinals and water closets to prevent water leakage when unoccupied.
  2. Use rainwater, reclaimed municipal water, or other non-potable water for flushing.
  3. Other techniques with prior approval from CHPS.

AND/OR

WE C1.1.2        Efficient Appliances

Specify and install ENERGY STAR or Consortium for Energy Efficiency (CEE) labeled appliances per Table WE 1-3.

Table WE 1-3: Water-Efficient Appliance Standards*

Appliance

Standard

Dishwashers

ENERGY STAR (6)

Food Steamers

CEE (7)

Ice Machines

ENERGY STAR or CEE

* Other efficient appliances, such as combination ovens, may be available and are strongly encouraged but are not required for this point.


WE P2.0    OUTDOOR WATER USE REDUCTION

PREREQUISITE

APPLICABILITY: All Projects

WE P2.0        REQUIREMENTS

WE P2.0.1        Landscape Irrigation Controls & Water Budget

Any irrigation systems used for campus landscape, gardens, or recreational areas must have sensors (soil moisture and/or rain sensors) and weather-based irrigation controllers (WBIC) meeting or exceeding WaterSense criteria to manage operation of irrigation systems when there is adequate ambient moisture.

And develop a water budget for landscape (both non-recreational and recreational) and ornamental water use to conform to the local water efficient landscape ordinance. If no local ordinance is applicable, then use the landscape and ornamental budget developed by the California Department of Water Resources.

OR

WE P2.0.2        No Permanent Landscape Irrigation

Install no permanent irrigation for landscaped areas: non-recreational areas are required, school gardens and recreation fields are optional. Project must specify drought resistant plants or grasses in these areas so that irrigation is not needed beyond plant establishment.


WE C2.1    ENHANCED OUTDOOR WATER USE REDUCTION

CREDIT

APPLICABILITY: All Projects installing irrigation systems

WE C2.1        REQUIREMENTS

WE C2.1.1        Non-Recreational Irrigation

Meet or exceed the following thresholds for reduction of water consumption (potable water, natural surface water, groundwater, captured rain, or reclaimed water) for irrigation of non-recreational areas over landscape budget baselines. Use best science-based practices to conserve or restore biodiverse ecosystem function with the use of native seeds or plants (or locally adapted native seeds or plants). Note: The landscape budget baseline is calculated based on current best practices and/or standards from the California Department of Water Resources.

  • ​​​​​​​20% (1 point)
  • 35% (2 points)
  • 50% (3 points)

AND/OR

WE C2.1.2        Recreational Irrigation

As in 2.1.1, meet or exceed the following thresholds for irrigation on recreational areas.

  • 20% (1 point)
  • 50% (2 points)


WE C3.1    IRRIGATION SYSTEMS COMMISSIONING

CREDIT

APPLICABILITY: All projects that include irrigation systems.

WE C3.1        REQUIREMENTS

Create an irrigation systems commissioning plan to manage operation and maintenance of irrigation systems. Complete irrigation systems commissioning review during construction and performance testing after installation. Provide documentation for ongoing operations and maintenance. Post the irrigation schedules for each station for each month at the irrigation controller. On an annual basis, review the system performance. Based on best science-based practices to conserve or restore biodiverse ecosystem function, adaptively update the operations and maintenance plan, as needed.