601.1
Applicability. This
chapter shall govern the materials, design and installation of water
supply systems, including backflow prevention devices, assemblies and
methods used for backflow prevention.
603.1
General. Cross-connection
control shall be provided in accordance with the provisions of this chapter.
Devices or assemblies for protection of the public water system must be models
approved by the department of health under WAC
246-290-490. The authority having
jurisdiction shall coordinate with the local water purveyor where applicable in
all matters concerning cross-connection control within the property lines of
the premises.
No person shall install any water operated equipment or
mechanism, or use any water treating chemical or substance, if it is found that
such equipment, mechanism, chemical or substance may cause pollution or
contamination of the domestic water supply. Such equipment or mechanism may be
permitted only when equipped with an approved back-flow prevention device or
assembly.
603.2
Approval of Devices or Assemblies. Before any device or assembly
is installed for the prevention of backflow, it shall have first been approved
by the authority having jurisdiction. Devices or assemblies shall be tested for
conformity with recognized standards or other standards acceptable to the
authority having jurisdiction. Backflow prevention devices and assemblies shall
comply with Table 603.2, except for specific applications and provisions as
stated in Section 603.5.1 through 603.5.21.
All devices or assemblies installed in a potable water supply
system for protection against backflow shall be maintained in good working
condition by the person or persons having control of such devices or
assemblies. Such devices or assemblies shall be tested in accordance with
Section 603.4.2 and WAC
246-290-490. If found to be
defective or inoperative, the device or assembly shall be replaced or repaired.
No device or assembly shall be removed from use or relocated or other device or
assembly substituted, without the approval of the authority having
jurisdiction.
Testing shall be performed by a Washington state department of
health certified backflow assembly tester.
TABLE 603.2
Backflow Prevention Devices, Assemblies and
Methods
The following line is deleted from the
table:
Device, Assembly or Method
|
Applicable Standards
|
Pollution (Low Hazard)
|
Contamination (High Hazard)
|
Installation
|
Back Siphonage
|
Back Pressure
|
Back Siphonage
|
Back Pressure
|
Backflow preventer for carbonated beverage dispensers
(two independent check valves with a vent to the atmosphere.)
|
ASSE 1022
|
X
|
|
|
|
Installation includes carbonated beverage machines or
dispensers. These devices operate under intermittent or continuous pressure
conditions.
|
603.4.2
Testing. For devices and assemblies other than those regulated by
the Washington department of health in conjunction with the local water
purveyor for the protection of public water systems, the authority having
jurisdiction shall ensure that the premise owner or responsible person shall
have the backflow prevention assembly tested by a Washington state department
of health certified backflow assembly tester:
(1) At the time of installation, repair or
relocation; and
(2) At least on an
annual schedule thereafter, unless more frequent testing is required by the
authority having jurisdiction.
603.5.6
Protection from Lawn Sprinklers
and Irrigation Systems. Potable water supplies to systems having no
pumps or connections for pumping equipment, and no chemical injection or
provisions for chemical injection, shall be protected from backflow by one of
the following:
(1) Atmospheric vacuum breaker
(AVB).
(2) Pressure vacuum breaker
backflow prevention assembly (PVB).
(3) Spill-resistant pressure vacuum breaker
(SVB).
(4) Reduced pressure
principle backflow prevention assembly (RP).
(5) A double check valve backflow prevention
assembly (DC) may be allowed when approved by the water purveyor and the
authority having jurisdiction.
603.5.10
Steam or Hot Water
Boilers. Potable water connections to steam or hot water boilers shall
be protected by an air gap or a reduced pressure principle backflow
preventer.
603.5.12
Beverage
Dispensers. Potable water supply to carbonators shall be protected by a
listed reduced pressure principle backflow preventer as approved by the
authority having jurisdiction for the specific use. The backflow preventer
shall comply with Section 603.4.3. The piping downstream of the backflow
preventer shall not be of copper, copper alloy, or other material that is
affected by carbon dioxide.
604.14
Plastic Pipe Termination.
Plastic water service piping may terminate within a building, provided the
connection to the potable water distribution system shall be made as near as is
practical to the point of entry and shall be accessible. Barbed insert fittings
with hose clamps are prohibited as a transition fitting within the building.
608.5
Discharge
Piping. The discharge piping serving a temperature relief valve,
pressure relief valve or combination of both shall have no valves, obstructions
or means of isolation and be provided with the following:
(1) Not less than the size of the valve
outlet and shall discharge full size to the flood level of the area receiving
the discharge and pointing down.
(2) Materials shall be rated at not less than
the operating temperature of the system and approved for such use or shall
comply with ASME A112.4.1. Materials shall be straight, rigid lengths only,
without coils or flexes.
(3)
Discharge pipe shall discharge independently by gravity through an air gap into
the drainage system or outside of the building with the end of the pipe not
exceeding 2 feet (610 mm) and not less than 6 inches (152 mm) above the ground
pointing downwards.
(4) Discharge
in such a manner that does not cause personal injury or structural
damage.
(5) No part of such
discharge pipe shall be trapped or subject to freezing.
(6) The terminal end of the pipe shall not be
threaded.
(7) Discharge from a
relief valve into a water heater pan shall be prohibited.
(8) The discharge termination point shall be
readily observable.
EXCEPTION:
|
Where no drainage was provided, replacement water
heating equipment shall only be required to provide a drain pointing downward
from the relief valve to extend between two (2) feet (610 mm) and six (6)
inches (152 mm) from the floor. No additional floor drain need be
provided.
|
609.12
Insulation of Potable Water
Piping. Domestic water piping within commercial buildings shall be
insulated in accordance with Section C404.6 of the Washington State Energy
Code, as applicable.
610.4
Sizing Water Supply and Distribution Systems. Systems within the
range of Table 610.4 may be sized from that table or by the method set forth in
Section 610.5.
Listed parallel water distribution systems shall be installed
in accordance with their listing.
611.1
Application. Drinking
water treatment units shall comply with NSF 42 or NSF 53. Water softeners shall
comply with NSF 44. Ultraviolet water treatment systems shall comply with NSF
55. Reverse osmosis drinking water treatment systems shall comply with NSF 58.
Drinking water distillation systems shall comply with NSF 62.
The owner of a building that serves potable water to
twenty-five or more people at least sixty or more days per year and that
installs drinking water treatment units including, but not limited to, the
treatment units in Section 611.1, may be regulated (as a Group A public water
system) by the Washington state department of health under chapter 246-290 WAC.
See Washington state department of health publication 331-488 for
guidance.
612.1
General. Where residential fire sprinkler systems are installed,
they shall be installed in accordance with the International Building Code or
International Residential Code.
Sections 612.2 through 612.7.2 are not
adopted.
Notes
Wash. Admin. Code
§
51-56-0600
Amended by
WSR
16-02-044, Filed 12/30/2015, effective
7/1/2016
Amended by
WSR
17-10-074, Filed 5/3/2017, effective
6/3/2017
Amended by
WSR
20-02-072, Filed 12/26/2019, effective
7/1/2020
Amended by
WSR
23-02-057, Filed 1/3/2023, effective
7/1/2023
Amended by
WSR
23-23-108, Filed 11/15/2023, effective
3/15/2024
Statutory Authority:
RCW
19.27.074,
19.27.031 and
chapters
19.27 and
34.05 RCW. WSR 13-04-054, §
51-56-0600, filed 2/1/13, effective 7/1/13. Statutory Authority:
RCW
19.27.031,
19.27.035,
19.27.074, and
chapters
19.27 and
34.05 RCW. WSR 12-07-018, §
51-56-0600, filed 3/12/12, effective 4/12/12. Statutory Authority:
RCW
19.27.074,
19.27.031 and
chapters
19.27 and
34.05 RCW. WSR 10-03-101, §
51-56-0600, filed 1/20/10, effective 7/1/10. Statutory Authority:
RCW
19.27.190,
19.27.020 and
chapters
19.27 and
34.05 RCW. WSR 07-01-094, §
51-56-0600, filed 12/19/06, effective 7/1/07. Statutory Authority:
RCW
19.27.031 and
19.27.074. WSR 04-01-110, §
51-56-0600, filed 12/17/03, effective 7/1/04; WSR 02-01-114, § 51-56-0600,
filed 12/18/01, effective 7/1/02. WSR 13-23-007, § 51-56-0600, filed
11/7/2013, effective 12/8/2013