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WASHINGTON STATEBUILDING CODECHAPTERS 51-56 and 51-57 WACUNIFORM PLUMBING CODEandUNIFORM PLUMBING CODE STANDARDS2006 EditionWashington State Building Code CouncilEffective July 1, 2007

Copies of the State Building Codes may be obtained from:Washington Association of Building OfficialsPost Office Box 7310Olympia, Washington 98507-7310(888) 664-9515www.wabo.org/bookstore.htmComplete copies of the 2006 Uniform Plumbing Code as published by theInternational Association of Plumbing and Mechanical Officialsmay be obtained from:International Association of Plumbing and Mechanical Officials(800) 85-IAPMO (854-2766) Fax 877 85-CODEShttp://publications.iapmo.org/Third Edition TitledUniform Plumbing CodeChapters 51-56/51-57 WACEffective July 1, 2007Printed March 2007Third Edition based onWSR 07-01-094

PrefaceAuthority: The Uniform Plumbing Code (Chapters 51-56 and 51-77 WAC) is adopted by the Washington State Building CodeCouncil pursuant to Chapters 19.27 and 70.92 RCW. This code was first adopted by reference by the Washington StateLegislature in 1974. In 1985, the Legislature delegated the responsibility of adoption and amendment of these codes to the StateBuilding Code Council.Supersession of Previous Codes: Chapters 51-56 and 51-57 WAC supersede Chapters 51-46 and 51-47 WAC.Code Precedence: The State Building Code Act, Chapter 19.27 RCW, establishes the following order of precedence among thedocuments adopted as parts of the State Building Code:International Building Code, Standards and amendments – WAC 51-50;International Residential Code, Standards and amendments – WAC 51-51;International Mechanical Code, Standards and amendments – WAC 51-52;International Fire Code, Standards and amendments – WAC 51-54;Uniform Plumbing Code, Standards and amendments – WAC 51-56, 51-57.Where there is a conflict between codes, an earlier named code takes precedence over a later named code. In the case of conflictbetween the duct insulation requirements of the International Mechanical Code and the duct insulation requirements of theEnergy Code, the Energy Code, or where applicable, a local jurisdiction's energy code, shall govern.Where, in any specific case, different sections of this Code specify different materials, methods of construction or otherrequirements, the most restrictive shall govern. Where there is conflict between a general requirement and a specificrequirement, the specific requirement shall be applicable.Organization and Numbering: These rules are written to allow compatible use with the Uniform Plumbing Code. All sectionswhich are amended, deleted, or added are referenced.Enforcement: The State Building Code Act requires that each local jurisdiction enforce the State Building Code within itsjurisdiction. Any jurisdiction can contract with another jurisdiction or an inspection agency to provide the mandatedenforcement activities.Amendments to the State Building Code:The State Building Code Council has adopted review procedures and approval criteria for local amendments. These proceduresand criteria are found in Chapter 51-04 WAC. The Council has exempted from its review any amendments to the administrativeprovisions of the various codes.Forms for proposing statewide amendments to the State Building Code are available from the State Building Code Council staff.A. Amendments of Statewide Application: On a yearly basis the State Building Code Council will consider proposals toamend the State Building Code. The Council is not scheduled to enter formal rulemaking until 2009 as part of itsconsideration of adoption of the 2009 series of codes.Proposals to amend the State Building Code shall be made on forms provided by the Building Code Council.Code Change Proposal Submittal Deadline: March 1st of each year.i

B. Local Amendments: Any jurisdiction may amend the State Building Code provided the amendments do not reduce theminimum performance standards of the codes. There are two areas where local amendments are limited or prohibited:Prohibited Amendments: Residential provisions of the State Energy Code (WAC 51-11), the Ventilation and IndoorAir Quality Code (WAC 51-13); any provision of the International Building Code or International Residential Codeaffecting accessibility; and standards specifically adopted in Chapters 19.27 and 19.27A WAC cannot be amended byany local jurisdiction.Residential Amendments: Amendments by local jurisdictions which affect the construction of single family andmulti-family residential buildings must be reviewed and approved by the State Building Code Council before suchamendments can be enforced. The State Building Code Act provides the following definition:Multi-family residential building: means common wall residential buildings that consist of four or fewerunits, that do not exceed two stories in height, that are less than 5,000 square feet in area, and that have aone-hour fire-resistive occupancy separation between units.Application forms for Council review of local amendments are available from the State Building Code Council Staff.Washington State Building Code CouncilPost Office Box 42525Olympia, Washington 98504-2525www.sbcc.wa.gov(360) 725-2967 Fax (360) 586-9383e-mail: [email protected] Format: This version of the rules is published as a series of insert or replacement pages. Each page providesinstructions for installing them in the model code book. Amendments to the model code which are new or revised from theprevious edition of this code are indicated by a line in the margin next to the revised portions.Effective Date: These rules were adopted by the State Building Code Council on November 17, 2006. The rules are effectivethroughout the state on July 1, 2007. (This version of the code is based on WAC 51-56 and 51-57 as published in WSR 07-01094. It is subject to review by the State Legislature during the 2007 session.)Building Permit Fees: The activities of the State Building Code Council are supported by permit fees collected by each cityand county. Section 19.27.085 of the State Building Code Act requires that a fee of 4.50 be imposed on each building permitissued by each city and county. In addition, a fee of 2.00 per unit shall be imposed for each dwelling unit after the first unit, oneach building containing more than one residential unit. For the purpose of this fee, WAC 365-110-035 defines building permitsas any permit to construct, enlarge, alter, repair, move, improve, remove, convert or demolish any building or structure regulatedby the Building Code. Exempt from the fee are plumbing, electrical, mechanical permits, permits issued to install amobile/manufactured home, commercial coach or factory built structure, or permits issued pursuant to the International FireCode.Each city and county shall remit moneys collected to the state treasury quarterly. No remittance is required until a minimum of 50.00 has accumulated.These permit fees are the amounts current in January 2007. Such fees may be changed by the State Legislature.Opinions: Only at the request of local enforcement officials, the State Building Code Council may issueinterpretations/opinions of those provisions of the State Building Code created by the Council, or provisions of the model codesamended by the Council. Final interpretation authority for any specific permit resides with the local enforcement official.ii

Table of ContentsSectionPageWAC 51-56-001Authority . AWAC 51-56-002Purpose . AWAC 51-56-003Uniform Plumbing Code . AWAC 51-56-007Exceptions . AWAC 51-56-008Implementation . AWAC 51-56-0100Chapter 1 AdministrationSection 101 – Title, Scope and General . 1Section 102 – Organization and Enforcement . 3Section 103 – Permits and Inspections . 3WAC 51-56-0200Chapter 2 DefinitionsSection 205 – C . 12Section 210 – H . 14Section 218 – P . 16WAC 51-56-0300Chapter 3 General RegulationsSection 301 – Materials – Standards and Alternates . 21Section 311 – Prohibited Fittings and Practices . 23Section 313 – Protection of Piping, Materials and Structures . 24WAC 51-56-0400Chapter 4 Plumbing Fixtures and Fixture FittingsSection 402 – Water-Conserving Fixtures and Fittings . 29Section 411 – Floor Drains and Shower Stalls . 31Section 412 – Minimum Number of Required Fixtures . 33WAC 51-56-0500Chapter 5 Water HeatersSection 501 – General . 39Table 5-1 . 39Section 502 – Definitions . 39Section 504 – Inspections . 40Section 505 – Prohibited Locations . 40Section 506 – Oil-Burning and Other Water Heaters . 41Section 507 – Air for Combustion and Ventilation . 41Section 508 – Other Water Heater Installation Requirements . 44Section 510 – Venting of Equipment . 48Section 511 – Sizing of Category I Venting System . 63Section 512 – Direct Vent Equipment . 67iii

WAC 51-56-0600Chapter 6 Water Supply and DistributionSection 603 – Cross-connection Control . 96Section 604 – Materials . 102Section 608 – Water Pressure, Pressure Regulators,Pressure Relief Valves, and Vacuum Relief Valves . 104Section 610 – Size of Potable Water Piping . 106WAC 51-56-0700Chapter 7 Sanitary DrainageSection 701 – Materials . 111Section 704 – Fixture Connections (Drainage) . 113Section 710 – Drainage of Fixtures Located Below theUpstream Manhole or Below the Main Sewer Level . 117Part II – Building Sewers . 119WAC 51-56-0900Chapter 9 VentsSection 903 – Materials . 127Section 908 – Vertical Wet Venting . 129WAC 51-56-1100Chapter 11 Storm DrainageSection 1101 – General . 137Section 1108 – Controlled Flow Roof Drainage . 140WAC 51-56-1300Chapter 13 Health Care Facilities and Medical Gasand Vacuum SystemsSection 1309 – Application . 202Section 1313 – System Performance . 205Section 1328 – System Verification . 218WAC 51-56-1400Chapter 14 Referenced StandardsSection 1401 – Referenced Standards . 223WAC 51-56-1400Chapter 16 Gray Water SystemsSection 1601 – Gray Water Systems – General . 263WAC 51-57-001Authority . BWAC 51-57-002Purpose . BWAC 51-57-003Uniform Plumbing Code Standards . BWAC 51-57-004Conflicts Between Appendix I and the Manufacturer’sInstallation Instructions . BWAC 51-57-007Exceptions . BWAC 51-57-008Implementation . Biv

WAC 51-57-790000IAPMO IS 7-2003, Polyethylene Cold Water Building Supplyand Yard PipingSection 2.6 Materials . 354WAC 51-57-895000IAPMO IS 8-2003, PVC Cold Water Building Supplyand Yard PipingSection 2.7 Materials . 358WAC 51-57-202000IAPMO IS 20-2005, CPVC Solvent CementedHot and Cold Water Distribution SystemsSection 2.1 Minimum Standards . 387v

Washington State AmendmentsCHAPTER 51-56 WACSTATE BUILDING CODE ADOPTION AND AMENDMENTOF THE 2006 EDITION OF THE UNIFORM PLUMBING CODEWAC 51-56-001 AUTHORITY.WAC 51-56-007 EXCEPTIONS.These rules are adopted under the authority of Chapter19.27 RCW.The exceptions and amendments to the model codescontained in the provisions of Chapter 19.27 RCW shallapply in cases of conflict with any of the provisions ofthese rules.WAC 51-56-002 PURPOSE.The purpose of these rules is to implement the provisions ofChapter 19.27 RCW, which provides that the StateBuilding Code Council shall maintain the State BuildingCode in a status which is consistent with the purpose as setforth in RCW 19.27.020. In maintaining the codes, thecouncil shall regularly review updated versions of the codesadopted under the act, and other pertinent information, andshall amend the codes as deemed appropriate by theCouncil.Codes referenced which are not adopted through RCW19.27.031 or Chapter 19.27A RCW shall not apply unlessspecifically adopted by the authority having jurisdiction.WAC 51-56-008 IMPLEMENTATION.The Uniform Plumbing Code adopted by Chapter 51-56WAC shall become effective in all counties and cities ofthis state on July 1, 2007, unless local governmentresidential amendments have been approved by the StateBuilding Code Council.WAC 51-56-003 UNIFORM PLUMBING CODE.The 2006 edition of the Uniform Plumbing Code, publishedby the International Association of Plumbing andMechanical Officials, is hereby adopted by reference withthe following additions, deletions and exceptions:PROVIDED that Chapters 12 and 15 of this code are notadopted. PROVIDED FURTHER, that those requirementsof the Uniform Plumbing Code relating to venting andcombustion air of fuel fired appliances as found in Chapter5 and those portions of the Code addressing buildingsewers are not adopted.AEffective July 1, 2007

2006 Uniform Plumbing CodeEffective July 1, 2007

Washington State AmendmentsEffective July 1, 2007

2006 Uniform Plumbing Code101.4.1.4 Conflicts Between Codes. Deleteparagraph.(Insert Facing Page 1)Effective July 1, 2007

Washington State AmendmentsEffective July 1, 2007

2006 Uniform Plumbing Code103.1.3 Certification. State rules and regulationsconcerning certification shall apply.102.4 Appeals. All persons shall have the right toappeal a decision of the Authority Having Jurisdiction. Thejurisdiction shall have a board of appeals to hear and ruleon Plumbing Code appeals. Members of the board shall beappointed by the jurisdiction. Decisions by the board shallbe reported to the jurisdiction and administered by theAuthority Having Jurisdiction.(Insert Facing Page 3)Effective July 1, 2007

Washington State AmendmentsCertified Backflow Assembly Tester – A personcertified by the Washington State Department of Healthunder Chapter 246-292 WAC to inspect (for correctinstallation and approval status) and test (for properoperation) approved backflow assemblies.(Insert Facing Page 12)Effective July 1, 2007

2006 Uniform Plumbing CodeEffective July 1, 2007

Washington State AmendmentsHot Water – This definition is not adopted.(Insert Facing Page 14)Effective July 1, 2007

2006 Uniform Plumbing CodeEffective July 1, 2007

Washington State AmendmentsPlumbing System – Includes all potable water buildingsupply and distribution pipes, all plumbing fixtures andtraps, all drainage and vent pipe(s), and all building drainsincluding their respective joints and connections, devices,receptors, and appurtenances within the property lines ofthe premises and shall include potable water piping, potablewater treating or using equipment, medical gas and medicalvacuum systems, and water heaters: Provided, that nocertification shall be required for the installation of aplumbing system within the property lines and outside abuilding.(Insert Facing Page 16)Effective July 1, 2007

2006 Uniform Plumbing CodeEffective July 1, 2007

Washington State AmendmentsEffective July 1, 2007

2006 Uniform Plumbing Code301.1.3 Standards. Standards listed or referred toin this chapter or other chapters cover materials whichwill conform to the requirements of this Code, whenused in accordance with the limitations imposed in thisor other chapters thereof and their listing. Where astandard covers materials of various grades, weights,quality, or configurations, there may be only a portionof the listed standard which is applicable. Design andmaterials for special conditions or materials notprovided for herein are allowed to be used by specialpermission of the Authority Having Jurisdiction afterthe Authority Having Jurisdiction has been satisfied asto their adequacy in accordance with Section 301.2.(Insert Facing Page 21)Effective July 1, 2007

Washington State AmendmentsEffective July 1, 2007

2006 Uniform Plumbing Code311.4 Except as hereinafter provided in Sections 908.0,909.0, 910.0, and Appendix L, Section L 6.0, 7.0 and 8.0,no vent pipe shall be used as a soil or waste pipe, nor shallany soil or waste pipe be used as a vent.(Insert Facing Page 23)Effective July 1, 2007

Washington State Amendments313.7 All pipes penetrating floor/ceiling assemblies andfire-resistance rated walls or partitions shall be protected inaccordance with the requirements of the building code.313.6 No water, soil, or waste pipe shall be installed orpermitted outside of a building or in an exterior wall unless,where necessary, adequate provision is made to protectsuch pipe from freezing. All hot and cold water pipesinstalled outside the conditioned space shall be insulated toa minimum R-3.(Insert Facing Page 24)Effective July 1, 2007

2006 Uniform Plumbing CodeEffective July 1, 2007

Washington State AmendmentsEffective July 1, 2007

2006 Uniform Plumbing Code402.0 Water-Conserving Fixtures and Fittings.402.3.1.5 This section does not apply to fixtures installed402.1 The purpose of this Section shall be to implementbefore the effective date of this Section, that are removedand relocated to another room or area of the same buildingafter the effective date of this Section.water conservation performance standards in accordancewith RCW 19.27.170.402.2 Application. This Section shall apply to all newconstruction and all remodeling involving replacement ofplumbing fixtures and fittings in all residential, hotel,motel, school, industrial, commercial use, or otheroccupancies determined by the council to use significantquantities of water. Plumbing fixtures, fittings andappurtenances shall conform to the standards specified inthis Section and shall be provided with an adequate supplyof potable water to flush and keep the fixtures in a cleanand sanitary condition without danger of backflow or crossconnection.402.3 Water Efficiency Standards.402.3.1 Standards for Vitreous China PlumbingFixtures.402.3.1.1 The following standards shall be adopted as402.3.2 Standards for Plumbing Fixture Fittings.402.3.2.1 The following standards are adopted as plumbingmaterial, performance requirements, and labeling standardsfor plumbing fixture fittings. Faucets, aerators, and showerheads shall meet either the ANSI/ASME standard or theCSA standard.ANSI/ASME A112.18.1M-1996CSA B125Plumbing Fixture FittingsPlumbing Fittings402.3.2.2 The maximum water use allowed for any showerhead is 2.5 gallons per minute or 9.5 liters per minute.Exception: Emergency use showers shall be exempt fromthe maximum water usage rates.402.3.2.3 The maximum water use allowed in gallons perminute (gpm) or liters per minute (lpm) for any of thefollowing faucets and replacement aerators is the following:plumbing materials, performance standards, and labelingstandards for water closets and urinals. Water closets andurinals shall meet either the ANSI/ASME standards or theCSA standard.Lavatory faucetsKitchen faucetsReplacement aeratorsPublic lavatory faucets otherthan meteringANSI/ASME A112.19.2M-1998402.4 Metering Valves. Lavatory faucets located inANSI/ASME A112.19.6-1995CSA B45Vitreous China PlumbingFixturesHydraulic Requirementsfor Water Closets andUrinalsCSA Standards onPlumbing Fixtures402.3.1.2 The maximum water use allowed in gallons perflush (gpf) or liters per flush (lpf) for any of the followingwater closets shall be the following:Tank-type toilets1.6 gpf/6.0 lpfFlushometer-valve toilets1.6 gpf/6.0 lpfFlushometer-tank toilets1.6 gpf/6.0 lpfElectromechanical hydraulic toilets1.6 gpf/6.0 lpfExceptions:(1) Water closets located in day care centers, intended foruse by young children may have a maximum water use of 3.5gallons per flush or 13.25 liters per flush.(2) Water closets with bed pan washers may have amaximum water use of 3.5 gallons per flush or 13.25 litersper flush.(3) Blow out bowls, as defined in ANSI/ASMEA112.19.2M, Section 5.1.2.3 may have a maximum wateruse of 3.5 gallons per flush or 13.25 liters per flush.402.3.1.3 The maximum water use allowed for any urinal2.5 gpm/9.5 lpm2.5 gpm/9.5 lpm2.5 gpm/9.5 lpm0.5 gpm/1.9 lpmrestrooms intended for use by the general public shall beequipped with a metering valve designed to close by springor water pressure when left unattended (self-closing).Exceptions:(1) Where designed and installed for use by persons witha disability.(2) Where installed in day care centers, for use primarilyby children under 6 years of age.402.5 Implementation.402.5.1 The standards for water efficiency and labelingcontained within Section 402.3 shall be in effect as of July1, 1993, as provided in RCW 19.27.170 and amended July1, 1998.402.5.2 No individual, public or private corporation, firm,political subdivision, government agency, or other legalentity, may, for purposes of use in the state of Washington,distribute, sell, offer for sale, import, install, or approve forinstallation any plumbing fixtures or fittings unless thefixtures or fittings meet the standards as provided for in thisSection.Section 402.6 is not adopted.shall be 1.0 gallons per flush or 3.78 liters per flush.402.3.1.4 No urinal or water closet that operates on acontinuous flow or continuous flush basis shall bepermitted.(Insert Facing Page 29)Effective July 1, 2007

Washington State AmendmentsEffective July 1, 2007

2006 Uniform Plumbing Code411.2 Location of Floor Drains. Floor drains shall beinstalled in the following areas:411.2.1 Toilet rooms containing two (2) or morewater closets or a combination of one (1) water closetand one (1) urinal, except in a dwelling unit. The floorshall slope toward the floor drains.411.2.2 Laundry rooms in commercial buildings andcommon laundry facilities in multi-family dwellingbuildings.(Insert Facing Page 31)Effective July 1, 2007

Washington State AmendmentsEffective July 1, 2007

2006 Uniform Plumbing Code412.0 Minimum Number of Required Fixtures. Forminimum number of plumbing fixtures required, seeBuilding Code Chapter 29 and Table 2902.1.Sections 412.1 through 412.7 and Table 4-1 are notadopted.(Insert Facing Page 33)Effective July 1, 2007

Washington State AmendmentsEffective July 1, 2007

2006 Uniform Plumbing Code502.5 Chimney, Metal – Delete definitionÖ501.0 General. The regulations of this chapter shallgovern the construction, location, and installation of fuelburning and other water heaters heating potable water. Theminimum capacity for water heaters shall be in accordancewith the first hour rating listed in Table 5-1. See theMechanical Code for combustion air and installation of allvents and their connectors. All design, construction, andworkmanship shall be in conformity with acceptedengineering practices, manufacturer’s installationinstructions, and applicable standards and shall be of suchcharacter as to secure the results sought to be obtained bythis Code. No water heater shall be hereinafter installedwhich does not comply in all respects with the type andmodel of each size thereof approved by the AuthorityHaving Jurisdiction. A list of accepted gas equipmentstandards is included in Table 14-1.502.7 Direct Vent Appliance – Delete definition502.8 Flue Collar – Delete definition502.9 Gas Vent, Type B – Delete definition502.0 Definitions502.10 Gas Vent, Type L – Delete definition502.2 Chimney – Delete definition502.3 Chimney, Factory-Built – Delete definition502.12 Vent – Delete definition502.4 Chimney, Masonry – Delete definition502.13 Vent Connector – Delete definitionTABLE 5-11,3Number of BathroomsNumber of Bedrooms2First Hour Rating ,Gallons1421 to 1.52354542542 to 2.53467675803673 to 3.5458080680Notes:1The first hour rating is found on the "Energy Guide" label.2Non-storage and solar water heaters shall be sized to meet the appropriate first hour rating as shown in the table.3For replacement water heaters, see Section 101.4.1.1.1.(Insert Facing Page 39)Effective July 1, 2007

Washington State Amendments502.14 Venting System – Delete definition504.1 Inspection of Chimneys and Vents. DeleteParagraph.505.1 Location. Water heater installation in bedrooms andbathrooms shall comply with one of the following:(1) Fuel-burning water heaters may be installed in a closetlocated in the bedroom or bathroom provided the closet isequipped with a listed, gasketed door assembly and a listedself-closing device. The self-closing door assembly shallmeet the requirements of Section 505.1.1. The doorassembly shall be installed with a threshold and bottomdoor seal and shall meet the requirements of Section505.1.2. All combustion air for such installations shall beobtained from the outdoors in accordance with theInternational Mechanical Code. The closet shall be for theexclusive use of the water heater.(2) Water heater shall be of the direct vent type.(Insert Facing Page 40)Effective July 1, 2007

2006 Uniform Plumbing Code507.0 Combustion Air. For issues relating tocombustion air, see the Mechanical Code.Delete remainder of Section 507.506.2 All storage-type water heaters deriving heat fromfuels or types of energy other than gas, shall be providedwith, in addition to the primary temperature controls, anover-temperature safety protection device constructed,listed, and installed in accordance with nationallyrecognized applicable standards for such devices and acombination temperature and pressure relief valve.(Insert Facing Page 41)Effective July 1, 2007

Washington State AmendmentsSections 508.6 through 508.9 are not adopted.(Insert Facing Page 44)Effective July 1, 2007

2006 Uniform Plumbing Code508.12 Building Structural Members. This section isnot adopted.508.18 Venting of Flue Gases. This section is notadopted.(Insert Facing Page 45)Effective July 1, 2007

Washington State AmendmentsSections 508.20 through 508.24.5 are not adopted.(Insert Facing Page 46)Effective July 1, 2007

2006 Uniform Plumbing CodeEffective July 1, 2007

Washington State Amendments510.0 Venting of Equipment. Delete entire section.(Insert Facing Page 48)Effective July 1, 2007

2006 Uniform Plumbing CodeEffective July 1, 2007

Washington State AmendmentsEffective July 1, 2007

2006 Uniform Plumbing Code511.0 Sizing of Category I Venting Systems. Deleteentire section.(Insert Facing Page 63)Effective July 1, 2007

Washington State AmendmentsEffective July 1, 2007

2006 Uniform Plumbing Code512.0 Direct Vent Equipment. Delete entire Section.The remainder of Chapter 5 is not adopted(Insert Facing Page 67)Effective July 1, 2007

Washington State Amendments603.0 Cross-Connection Control. Cross-connectioncontrol shall be provided in accordance with the provisionsof this chapter. Devices or assemblies for protection of thepublic water system must be models approved by theDepartment of Health under WAC 246-290-490. TheAuthority Having Jurisdiction shall coordinate with thelocal water purveyor where applicable in all mattersconcerning cross-connection control within the propertylines of the premises.No person shall install any water operated equipment ormechanism, or use any water treating chemical orsubstance, if it is found that such equipment, mechanism,chemical or substance may cause pollution orcontamination of the domestic water supply. Suchequipment or mechanism may be permitted only whenequipped with an approved backflow prevention device orassembly.603.1 Approval of Devices or Assemblies. Beforeany device or assembly is installed for the prevention ofbackflow, it shall have first been approved by the authorityhaving jurisdiction. Devices or assemblies shall be testedfor conformity with recognized standards or other standardsacceptable to the authority having jurisdiction that areconsistent with the intent of this code.All devices or assemblies installed in a potable watersupply system for protection against backflow shall bemaintained

WAC 51-56-003 UNIFORM PLUMBING CODE. The 2006 edition of the Uniform Plumbing Code, published by the International Association of Plumbing and Mechanical Officials, is hereby adopted by reference with the following additions, deletions and exceptions: PROVIDED that Chapters