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TABLE 422.1 MINIMUM NUMBER OF REQUIRED PLUMBING FIXTURESa(See Sections 403.1.1 and 403.2)(Reprinted with permission,* from the 2018 International Plumbing Code, excerpt from IPC Table 403.1)WATER CLOSETS(URINALS: SEESECTION 422.7)NO.CLASSIFICATIONDESCRIPTIONHotels, motels, boardinghouses (transient)Dormitories, fraternities,sororities and boardinghouses (not transient)7MALEFEMALE1 per sleeping unit1 per 10LAVATORIESMALEFEMALEBATHTUBS/SHOWERS1 per1 per sleeping unitsleeping unit1 per 101 per 8DRINKINGFOUNTAIN(SEESECTION415.0)—1 per 1001 servicesinkResidentialApartment house1 per dwelling unit81 per dwelling unit1 perdwellingunitOTHER1 servicesink—1 kitchensink perdwellingunit; 1automaticclotheswasherconnectionper 20dwellingunits

TABLE 422.1 MINIMUM NUMBER OF REQUIRED PLUMBING FIXTURESa(See Sections 403.1.1 and 403.2)(Reprinted with permission,* from the 2018 International Plumbing Code, excerpt from IPC Table 403.1)WATER CLOSETS(URINALS: SEESECTION 422.7)NO.CLASSIFICATIONDESCRIPTIONCongregate livingfacilities with 16 orfewer persons7Residential(cont’d)One- and two-familydwellings and lodginghouses with five or fewerguestroomsCongregate livingfacilities with 16 orfewer persons8StorageStructures for the storageof goods, warehouses,storehouse and freightdepots. Low andModerate Hazard.MALEFEMALE1 per 101 per 101 per 10091 per 81 per 100LAVATORIESMALEFEMALE1 per 101 per dwelling .0)1 per dwelling unit1 perdwellingunit—OTHER1 servicesink1 kitchensink perdwellingunit; 1automaticclotheswasherconnectionperdwellingunit1 per 101 per 81 per 1001 servicesink1 per 100—1 per 1,0001 servicesink

a The fixtures shown are based on one fixture being the minimum requiredfor the number of persons indicated or any fraction of the number of personsindicated. The number of occupants shall be determined by the InternationalBuilding Code.b Toilet facilities for employees shall be separate from facilities forinmates or care recipients.c A single-occupant toilet room with one water closet and one lavatoryserving not more than two adjacent patient sleeping units shall be permittedprovided that each patient sleeping unit has direct access to the toilet room andprovision for privacy for the toilet room user is provided.d The occupant load for seasonal outdoor seating and entertainment areasshall be included when determining the minimum number of facilities required.e For business and mercantile classifications with an occupant load of 15or fewer, service sinks shall not be required.f The required number and type of plumbing fixtures for outdoor publicswimming pools shall be in accordance with Section 609 of the InternationalSwimming Pool and Spa Code.*Excerpted (with modifications) from Table 403.1 of the 2018 InternationalPlumbing Code; Copyright 2017; Washington, D.C.: International CodeCouncil. Reproduced with permission. All rights reserved. www.ICCSAFE.orgk. Subsection 422.2.2 Family or Assisted-Use Toilet and Bathing Facilities.Modify the subsection by adding the following sentence to the end of the subsection:“Required family or assisted-use fixtures are permitted to be included in the numberof required fixtures for either the male or female occupants in assembly andmercantile occupancies.”h. Insert the following text at the end of Chapter 4:“422.6 Substitution for Water Closets. In each bathroom or toilet room, urinalsshall not be substituted for more than 67 percent of the required water closets inassembly and educational occupancies. Urinals shall not be substituted for morethan 50 percent of the required water closets in all other occupancies. (Reprintedfrom the 2018 International Plumbing Code section 424.2)”25.4(4) The following amendments shall apply to UPC Chapter 6:a. Section 603.4.8 Drain Lines. Modify the section by adding the followinglanguage to the end of the last sentence in the section: “or in accordance with themanufacturer’s drain-sizing chart for installation.”10

b. Section 609.1 Installation. Delete Section 609.1 and insert the following inlieu thereof: Section 609.1 Installation. Water piping shall be adequatelysupported in accordance with Tablec. 313.3. Burred ends shall be reamed to the full bore of the pipe or tube.Changes in direction shall be made by the appropriate use of fittings, except thatchanges in direction in copper or copper alloy tubing shall be permitted to be madewith bends, provided that such bends are made with bending equipment that doesnot deform or create a loss in the cross-sectional area of the tubing. Changes indirection are allowed with flexible pipe and tubing without fittings in accordancewith the manufacturer’s instructions. Provisions shall be made for expansion in hotwater piping. Piping, equipment, appurtenances, and devices shall be installed in aworkmanlike manner in accordance with the provisions and intent of the code.Building supply yard piping shall be not less than 60 inches below earth cover.Delete sections 609.11 throughd. Section 609.11 Pipe Insulation.609.11.2 and insert the following in lieu thereof:a Section 609.11 Pipe Insulation. Insulation of domestic hot water pipingshall be in accordance with the applicable energy conservation code.b Section 611.4 Sizing of Residential Softeners. Modify the section byadding the following to the end of the last sentence in the section: “or as specifiedin the manufacturer’s installation instructions.”c Section 612 Residential Fire Sprinkler Systems. Delete sections 612.0through 612.7.2.25.4(5) The following amendments shall apply to UPC Chapter 7:a. Section 710.1 Backflow Protection. Modify the section by adding thefollowing sentences to the end of the section: “The requirement for the installationof a backwater valve shall apply only when determined necessary by the AuthorityHaving Jurisdiction based on local conditions. When a valve is required by theAuthority Having Jurisdiction, it shall be a manually operated gate valve or fullwayball valve. An automatic backwater valve may also be installed but is not required.”b. Section 717.1 General. Modify the section by adding the followinglanguage to the end of the section: “No building sewer shall be smaller than 4inches in diameter.”11

25.4(6) The following amendments shall apply to UPC Chapter 8:a. Section 807.3 Domestic Dishwashing Machine. Modify the section bydeleting the section and inserting the following language in lieu thereof:“No domestic dishwashing machine shall be directly connected to a drainagesystem or food waste disposer without the use of an approved dishwasher air gapfitting on the discharge side of the dishwashing machine, or by looping thedischarge line of the dishwasher as high as possible near the flood level of thekitchen sink where the waste disposer is connected. Listed air gap fittings shall beinstalled with the flood level (FL) marking at or above the flood level of the sink ordrainboard, whichever is higher.”b. Section 814.5 Point of Discharge. Delete Section 814.5 and insert thefollowing in lieu thereof:Section 814.5 Point of Discharge. Air-conditioning condensate waste pipesshall connect indirectly to a properly trapped fixture, floor drain, or open sightdrain, or where permitted in Section 814.6, to the drainage system through an airgap or air break to trapped and vented receptors, dry wells, leach pits, sump pump,the tailpiece of plumbing fixtures or indirectly to the building storm sewer througha roof drain. A condensate drain shall be trapped in accordance with appliancemanufacturer’s instructions or as approved.25.4(7) The following amendments shall apply to UPC Chapter 9:a. Section 901.1 Applicability. Modify the section by adding the followingsentence to the end of the section: “No engineered single-stack drainage systemsshall be installed.”b. Section 906.1 Roof Termination. Modify the section by deleting the lastsentence.c. Section 906.7 Frost or Snow Closure. Modify the section by deleting “two(2) inches (50.8 mm)” in the first sentence and inserting “three (3) inches (76.2mm)” in lieu thereof.d. Section 908.2.2 Size. Delete the second sentence in this section and insertthe following new sentence in lieu thereof: “The wet vent shall be not less than 2inches (50 mm) in diameter for 6 drainage fixture units (dfu) or less, and not lessthan 3 inches (80 mm) in diameter for 7 dfu or more.”25.4(8) The following amendments shall apply to UPC Chapter 10:12

a. Table 1002.2 Horizontal Lengths of Trap Arms. Delete the table and insertthe following table in lieu thereof:TABLE 1002.2Horizontal Lengths of Trap Arms1,2(Except for Water Closets and Similar Features)Trap Arm Diameter(inches)1¼1½234Exceeding 4Distance Trap to VentMinimum (inches)2½34682 DiameterLength Maximum(feet)568121212For SI units: 1 inch 25.4 mmNotes:1Maintain ¼ inch per foot slope (20.8 mm/m).2The developed length between the trap of a water closet or similar fixture (measuredfrom the top of the closet flange to the inner edge of the vent) and its vent shall not exceed6 feet (1829 mm).b. Section 1014.1.3 Food Waste Disposers and Dishwashers. Modify the sectionby deleting the second sentence and inserting the following in lieu thereof:“Commercial food waste disposers shall discharge into the building’s drainagesystem in accordance with the requirements of the Authority Having Jurisdiction.”25.4(9) The following amendments shall apply to UPC Chapter 12:a.Sections 1205.0 through 1205.2 Authority to Render Gas Service. Delete thesections.b.Sections 1207.0 and 1207.1 Temporary Use of Gas. Delete the13

sections.c.Subsection 1208.6.4.4 Corrugated Stainless Steel Tubing. Deletesubsection 1208.6.4.4 and insert the following in lieu thereof:“Subsection 1208.6.4.4 Corrugated Stainless Steel Tubing. Only CSST with anarc-resistant jacket or covering system listed in accordance with ANSI LC-1(Optional Section 5.16)/CSA 6.26-2016 shall be installed, in accordance with theterms of its approval, the conditions of listing, the manufacturer’s instructions andthis code, including electrical bonding requirements in Section 1211.2. CSST shallnot be used for through-wall penetrations from the point of delivery of the gassupply to the inside of the structure. CSST shall not be installed in locations wheresubject to physical damage unless protected in an approved manner.”25.4(10) The following amendment shall apply to UPC Chapter 13:Section 1319.3 Report Items. Modify the section by deleting “Authority HavingJurisdiction” and inserting “responsible facility authority” in lieu thereof.641—25.5(105) Backflow prevention with containment. Cities withpopulations of 15,000 or greater as determined by the 2010 census or anysubsequent regular or special census shall have a backflow prevention programwith containment. The minimum requirements for a program are given insubrules 25.5(1) through 25.5(5). These requirements are in addition to theapplicable requirements of Section 603 of the Uniform Plumbing Code, 2018Edition.25.5(1) Definitions. The following definitions are added to those in Chapter 2and Section 603 of the Uniform Plumbing Code, 2018 Edition, or are modifiedfrom those definitions for the purposes of rule 641—25.5(105) only.a. Administrative authority. The administrative authority for this rule is thecity council and its designees or, with respect to private water utilities, the Iowautilities board.b. Approved backflow prevention assembly for containment. Approvedbackflow prevention assembly for containment means a backflow preventionassembly which is approved by the University of Southern California Foundationfor Cross-Connection Control and Hydraulic Research. The approval listing shallinclude the limitations of use based on the degree of hazard. The backflowprevention assembly shall also be listed by the International Association of14

Plumbing and Mechanical Officials (IAPMO) or by the American Society ofSanitary Engineering (ASSE) as having met the requirements of one of thestandards listed below.StandardProduct CoveredANSI /ASSE* 1013-2009ANSI /ASSE* 1015-2009ANSI /ASSE* 1047-2009ANSI /ASSE* 1048-2009Reduced Pressure Principle Backflow PreventersDouble Check Backflow Prevention AssemblyReduced Pressure Detector Backflow PreventerDouble Check Detector Assembly Backflow PreventerANSI /AWWA† C510-07Double Check Valve Backflow Prevention AssemblyANSI /AWWA† C511-07Reduced-Pressure Principle Backflow Prevention Assembly American National Standards Institute, 1899 L Street NW, 11th Floor,Washington, DC 20036*American Society of Sanitary Engineering, 18927 Hickory Creek Drive #220,Mokena, IL 60448†American Water Works Association, 6666 West Quincy Avenue, Denver, CO80235c. Approved backflow prevention assembly for containment in a fire protectionsystem. Approved backflow prevention assembly for containment in a fireprotection system means a backflow prevention assembly to be used in a fireprotection system which meets the requirements of Factory Mutual ResearchCorporation (FM) and Underwriters Laboratory (UL) in addition to therequirements of 25.5(1)“b.”d. Containment. Containment is a method of backflow prevention whichrequires a backflow prevention assembly on certain water services. Containmentrequires that the backflow prevention assembly be installed on the water serviceas close to the public water supply main as is practical.e. Customer. Customer means the owner, operator or occupant of a building orproperty which has a water service from a public water system, or the owner oroperator of a private water system which has a water service from a public watersystem.f. Degree of hazard. Degree of hazard means the rating of a cross connection ora water service which indicates if it has the potential to cause contamination15

(high hazard) or pollution (low hazard).g. Water service. Depending on the context, water service is the physicalconnection between a public water system and a customer’s building, property orprivate water system, or the act of providing potable water from a public watersystem to a customer.25.5(2) Proposed water service.a. No person shall install, or cause to have installed, a water service to abuilding, property or private water system before the administrative authority hasevaluated the proposed water service for degree of hazard.b.The administrative authority shall require the submission of plans,specifications and other information deemed necessary for a building, property orprivate water system to which a water service is proposed. The administrativeauthority shall review the information submitted to determine if cross connectionswill exist and the degree of hazard.c.The owner of a building, property or private water system shall install, orcause to have installed, an approved backflow prevention assembly forcontainment as directed by the administrative authority before water service isinitiated.d.Reconstruction of an existing water service shall be treated as a proposedwater service for the purposes of rule 641—25.5(135).25.5(3) Existing water services.a. Each customer shall survey the activities and processes which receive waterfrom the water service and shall report to the administrative authority if crossconnections exist and the degree of hazard.b.The administrative authority may inspect the plumbing of any building,property and private water system which has a water service to determine if crossconnections exist and the degree of hazard.c.If, based on information provided through 25.5(3)“a” and “b,” theadministrative authority determines that a water service may contaminate the16

public water supply, the administrative authority shall require that the customerinstall the appropriate backflow prevention assembly for containment.d.If a customer refuses to install a backflow prevention assembly forcontainment when it is required by the administrative authority, the administrativeauthority may order that water service to the customer be discontinued until anappropriate backflow prevention assembly is installed.25.5(4) Backflow prevention assemblies for containment.a. Backflow prevention assemblies for containment shall be installedimmediately following the water meter or as close to that location as deemedpractical by the administrative authority.b.A water service determined to present a high hazard shall be protected byan air gap or an approved reduced-pressure principle backflow preventionassembly.c.A water service determined to present a low hazard shall be protected by anapproved double check valve assembly or as in 25.5(4)“b.”d.A water service to a fire protection system shall be protected from backflowin accordance with the recommendations of American Water Works AssociationManual M14. Where backflow prevention is required for a fire protection system,an approved backflow prevention assembly for containment in a fire protectionsystem shall be used.25.5(5) Backflow incidents.a. The customer shall immediately notify the agency providing water servicewhen the customer becomes aware that backflow has occurred in the building,property or private water system receiving water service.b. The administrative authority may order that a water service be temporarilyshut off when a backflow occurs in a customer’s building, property or privatewater system.17

These rules are intended to implement Iowa Code chapter 105 as amended by 2013 IowaActs, Senate File 427.[Filed 12/3/81, Notice 9/2/81—published 12/23/81, effective 1/27/82][Filed 2/24/84, Notice 10/26/83—published 3/14/84, effective 4/18/84][Filed emergency 7/11/86 after Notice 4/23/86—published 7/30/86, effective 7/11/86][Filed emergency 7/10/87—published 7/29/87, effective 7/10/87][Filed 1/17/89, Notice 11/16/88—published 2/8/89, effective 3/15/89][Filed 7/17/92, Notice 1/22/92—published 8/5/92, effective 9/9/92][Filed 5/13/96, Notice 3/13/96—published 6/5/96, effective 7/10/96][Filed 9/14/01, Notice 8/8/01—published 10/3/01, effective 11/19/01][Filed ARC 8860B (Notice ARC 8703B, IAB 4/21/10), IAB 6/16/10, effective 7/21/10][Filed ARC 1089C (Notice ARC 0811C, IAB 6/26/13), IAB 10/16/13, effective 11/20/13][Filed ARC 2474C (Notice ARC 2317C, IAB 12/23/15), IAB 3/30/16, effective 6/1/16][Filed Emergency ARC 2614C, IAB 7/6/16, effective 6/15/16][Filed ARC 3062C (Notice ARC 2900C, IAB 1/18/17), IAB 5/10/17, effective 6/14/17][Filed ARC 4611C (Notice ARC 4447C, IAB 5/22/19), IAB 8/14/19, effective 9/18/19]18

EXERPT OF ADDITIONAL IOWA STATUTES GOVERNING PLUMBING2019 Iowa Code105.4 Plumbing installation code — rules.1. a. The board shall establish by rule a plumbing installation code governingthe installation of plumbing in this state. Consistent with fire safety rules andstandards promulgated by the state fire marshal, the board shall adopt the mostcurrent version of the uniform plumbing code and the international mechanicalcode, as the state plumbing code and the state mechanical code, to govern theinstallation of plumbing and mechanical systems in this state. The board shalladopt the current version of each code within six months of its being released. Theboard may adopt amendments to each code by rule. The board shall work inconsultation with the state fire marshal to ensure that proposed amendments do notconflict with the fire safety rules and standards promulgated by the state firemarshal. The state plumbing code and the state mechanical code shall be applicableto all buildings and structures owned by the state or an agency of the state and ineach local jurisdiction.b. Except as provided in paragraph “c”,

, the Uniform Plumbing Code (UPC), 2018 edition, as published by the International Association of Plumbing and Mechanical Officials (IAPMO) is the State Plumbing Code for Iowa. The provisions of Section 101 and Chapters 2 to 17 of . the UPC are adopted by reference with the amendments specified herein as the state plumbing code.