All San Francisco Green Businesses must use toilets with 1.6 gallons or less flush volume. ULFTs and HETs are approved for use.
ULFT's: In 1994 new water conserving toilets, called ultra-low-flush toilets (ULFT's) were required in all new construction. ULFT's use 1.6 gallons per flush and are much more water efficient than older toilets, which use up to 7 gallons per flush. Each installed ULFT can save a typical family 70 gallons a day in water use.
A number of commercial ULFTs are available in a range of rough-in sizes and shapes. Both wall-mount and floor-mount 1.6 gallon per flush toilets are readily available. The efficiency of a Flushometer and bowl combination toilet depends mainly upon the right combination and regular maintenance of the flushometer valve.
HET's: High-Efficiency toilets (HET) are fairly new to the American market but have long been used overseas. The HET flushes at least 20% below the standard model. Many HET's are dual-flush toilets, which have two separate flush volume options, a half flush (.8 gallons) and a full flush (1.6 gallons).
SFPUC currently offers a $125 rebate for replacing your pre-1994 water-guzzling toilet with an approved tank-style HET.
There are several industrial flushometer HET's on the market, and over a dozen have passed performance standards set by the CUWCC (California Urban Water Conservation Council). SFPUC offers financial incentives of up to $200 per fixture for installing qualifying flushometer valve/bowl combinations.
How to document: Take a picture of all toilets and each flow rate (this usually can be found on the base near the hinges of the seat – see picture below):