San Francisco County Municipal Code Ch. 6 Water Supply

SECTION 603.0 – CROSS-CONNECTION CONTROL 603.1 Add a third paragraph to this section as follows: Structures with alternate water piping shall have a Reduced-Pressure Principle Backflow Prevention Assembly installed on the domestic supply as close as practical to the meter. 603.2 Revise Table 603.2 as follows: Add a footnote for the Applicable Standards heading that states: All backflow prevention assemblies or devices that are testable must have passed laboratory and field evaluation tests performed by a recognized testing organization. Revise the tenth entry in the Table to read as follows:

Backflow preventer for Carbonated Beverage Dispensers (two independent check valves with a vent to the atmosphere) ASSE 1022 X [ ← ] -- X [ ← ] -- Installation includes carbonated beverage machines or dispensers. These devices operate under intermittent or continuous pressure conditions. This device is only permitted in systems with no upstream copper pipe. Otherwise, a reduced pressure principle backflow prevention assembly is required.

603.5.6.4 Add the following section: 603.5.6.4 Approval. All such installations shall be approved in writing by the San Francisco Water Department prior to installation.

603.5.12 Revise section as follows: 603.5.12 Beverage Dispensers. Potable water supply to beverage dispensers, carbonated beverage dispensers, or coffee machines shall be protected by an air gap, a reduced pressure principle backflow prevention assembly, or a vented backflow preventer that complies with ASSE 1022, except that a vented backflow preventer may not be used to protect carbonated beverage dispensers in systems with upstream copper pipe. For carbonated beverage dispensers, piping material installed downstream of the backflow preventer shall not be affected by carbon dioxide gas.[ ← ] 603.5.23 Add the following section: 603.5.23 Industrial Water Chillers. Potable water connections to closed-loop industrial water chillers shall be protected from backflow by a reduced pressure principle backflow prevention assembly in accordance with Table 603.2. SECTION 604.0 – MATERIALS 604.1 Add the following sentence to the end of the second paragraph: Connections between copper water piping and ferrous materials shall be made with dielectric or insulated fittings or brass nipples of 6 inches (152.4 mm) minimum length. SECTION 606.0 – VALVES 606.2 Revise this section as follows: 606.2 Fullway Valve. A fullway valve controlling outlets shall be installed on the discharge side of each water meter and each unmetered water supply as near as possible to the point after where the water supply enters the building and before the first fitting or branch line. Water piping supplying more than one building on one premise shall be equipped with a separate fullway valve to each building, so arranged that the water supply can be turned on or off to any individual or separate building provided; however, that supply piping to a single-family residence and building accessory thereto shall be permitted to be controlled by one valve. Such shutoff valves shall be accessible. A fullway valve shall be installed on the discharge piping from water supply tanks at or near the tank. A fullway valve shall be installed on the cold water supply pipe to each water heater at or near the water heater. In cases where one water heater or boiler supplies hot water to multiple units additional fullway valves will be installed so that the hot water supplies to any apartment / unit / dwelling or condominium can be shut off without interrupting the hot water supply to any other apartment / unit / dwelling or condominium. These valves shall be accessible in the dwelling unit they control or other common area within the building. 606.3 Revise this section as follows: 606.3 Multidwelling Units. In multidwelling units, one or more shutoff valves shall be provided in each dwelling unit so that the hot and cold water [ ← ] supplies to [ ← ] any apartment / unit / dwelling or condominium can be shut off without [ ← ] interrupting the water supply to [ ← ] another apartment / unit / dwelling or condominium. These valves shall be accessible in the dwelling unit they control or other common area within the building. 606.3.1 Add the following section: 606.3.1 Any apartment / unit / dwelling or condominium where a remodel is performed shall meet the requirements of sections 606.2, 606.3 and 606.5. 606.5 Revise this section as follows: 606.5 Control Valve. A control valve shall be installed immediately ahead of each plumbing fixture hot and cold water supply and water supplied appliances [ ← ] to permit servicing and replacement of individual fixtures. 606.11 Add the following section: 606.11 Backflow Assembly. All buildings four stories or more in height or water supply greater than 40 feet above the water meter shall have an approved backflow assembly installed as near as possible to the water meter and before the first fitting or branch line. The backflow assembly installed shall be in accordance to the degree of hazard within the building, but in no case less than an approved double check assembly. See Table 603.2. SECTION 609.0 – INSTALLATION, TESTING, UNIONS AND LOCATION

609.11.2 Add the following section: 609.11.2 Air Chambers. Air chambers shall be installed on all hot and cold water outlets supplying quick-acting valves to provide water hammer relief. The size of each air chamber shall be 24 times the diameter of the fixture supply. 609.11.3 Add the following section: 609.11.3 Quick-Acting Valves. The following valves shall be considered quick-acting: flushometers, single-handle faucets, single-handle tub and tub/shower combination control valves, single-handle shower control valves, rapid response electric solenoid valves (such as used on ice-makers, clothes washers, etc.) and any other appliance or fixture that dispenses water in a quick open and close method in its operation.