chapter 6

1 Hot and Cold Water plumbing fixture shall be providedwith an adequate supply of potable running water piped toit in an approved manner, so arranged as to flush and keepthe fixture in a clean and sanitary condition without dangerof backflow or cross-connection. Water closets and urinalsshall be flushed by means of an approved flush tank orflushometer : Listed fixtures that do not require water fortheir operation and are not connected to the water Hot Water Required. In occupancies whereplumbing fixtures are installed for private use, hot watershall be required for bathing, washing, laundry, cookingpurposes, dishwashing, and maintenance.

2 In occupan-cies where plumbing fixtures are installed for publicuse, hot water shall be required for bathing and washingpurposes. This requirement shall not supersede therequirements for individual temperature control limita-tions for public lavatories, bidets, bathtubs, whirlpoolbathtubs and shower control Hot Water Recirculation. Hot water supplysystems in four-story buildings or higher, or buildingswhere the developed length of hot water piping from thesource of hot water supply to the farthest fixture sup-plied exceeds 100 feet, shall be of the return Identification of a Potable and NonpotableWater buildings where potable water andnonpotable water systems are installed, each system shallbe clearly identified in accordance with Section Section Potable Water.

3 Green background withwhite Color and system shallbe identified with a colored pipe or band and codedwith paints, wraps, and materials compatible with as required in Section , non-potable water systems shall have a yellow backgroundwith black uppercase lettering, with the words CAU-TION: NONPOTABLE WATER, DO NOT DRINK. Each nonpotable system shall be identified to designatethe liquid being conveyed, and the direction of normalflow shall be clearly shown. The minimum size of theletters and length of the color field shall comply withTable background color and required informationshall be indicated every 20 feet (6096 mm) but not lessthan once per room, and shall be visible from the Alternate Water Sources.

4 Alternatewater source systems shall have a purple (Pantonecolor No. 512, 522C, or equivalent) backgroundwith uppercase lettering and shall be field or fac-tory marked as follows:(1) Gray water systems shall be marked in accor-dance with this section with the words CAU-TION: NONPOTABLE GRAY WATER, DONOT DRINK in yellow letters (Pantone 108or equivalent).(2) Reclaimed (recycled) water systems shall bemarked in accordance with this section withthe words: CAUTION: NONPOTABLERECLAIMED (RECYCLED) WATER, DONOT DRINK in black letters.(3) On-site treated water systems shall be markedin accordance with this section with thewords: CAUTION: ON-SITE TREATEDNONPOTABLE WATER, DO NOT DRINK in yellow letters (Pantone 108 or equivalent).

5 (4) Rainwater catchment systems shall be markedin accordance with this section with thewords: CAUTION: NONPOTABLE RAIN-WATER WATER, DO NOT DRINK in yel-low letters (Pantone 108 or equivalent). Fixtures. Where vacuum breakers or back-flow preventers are installed with fixtures listed inTable , identification of the discharge side shallbe permitted to be omitted. Outlets. Each outlet on the nonpotable waterline that is used for special purposes shall be postedwith black uppercase lettering as follows: CAUTION:NONPOTABLE WATER, DO NOT DRINK. Unlawful Prohibited installation of potablewater supply piping, or part thereof, shall be made in such a372015 MINNESOTA PLUMBING CODECHAPTER 6 WATER SUPPLY AND DISTRIBUTIONOUTSIDE DIAMETER OFPIPE OR COVERING(inches)MINIMUM LENGTHOF COLOR FIELD(inches)MINIMUM SIZE OFLETTERS(inches)1 2to 11 481 211 2to 283 421 2to 61211 48 to 102421 2 Over 103231 2 For SI units.

6 1 inch = mmTABLE LENGTH OF COLOR FIELD AND SIZE OF LETTERS2015 MINNESOTA PLUMBING CODEWATER SUPPLY AND DISTRIBUTION38manner that it will be possible for used, unclean, polluted,or contaminated water, mixtures, or substances to enter aportion of such piping from a tank, receptor, equipment, orplumbing fixture by reason of backsiphonage, suction, orother cause, either during normal use and operation thereof,or where such tank, receptor, equipment, or plumbing fix-ture is flooded or subject to pressure exceeding the operat-ing pressure in the hot or cold water there is provided abackflow prevention device approved for the potential haz-ard and maintained in accordance with this code, no personshall make a connection or allow one to exist between pipesor conduits carrying domestic water supplied by a public orprivate building supply system, and (1) pipes, conduits, orfixtures containing or carrying water from any other sourceor containing or carrying water that has been used for anypurpose whatsoever, or (2)

7 Any piping carrying chemicals,liquids, gases, or substances whatsoever. Each point of useshall be separately protected where potential cross-contami-nation of individual units exists. Water used for cooling orheating of equipment or other purposes shall not bereturned to the potable water system. Such water shall bedischarged into the drainage system through an air-gappedindirect waste or other approved method of Backflow plumbing fixture,device, or construction shall be installed or maintained, orshall be connected to a domestic water supply, where suchinstallation or connection provides a possibility of pollutingsuch water supply or cross-connection between a distribut-ing system of water for drinking and domestic purposes andwater that becomes contaminated by such plumbing fixture,device.

8 Or construction unless there is provided a backflowprevention device approved for the potential Approval by Authority. No water piping suppliedby a private water supply system shall be connected to anyother source of supply without the approval of the Author-ity Having Cross-Connection General. Cross-connection control shall be pro-vided in accordance with the provisions of this person shall install a water-operated equipment ormechanism, or use a water-treating chemical or substance,where it is found that such equipment, mechanism, chemi-cal, or substance causes pollution or contamination of thedomestic water supply.

9 Such equipment or mechanism shallbe permitted where equipped with an approved backflowprevention device or Approval of Devices or adevice or an assembly is installed for the prevention ofbackflow, it shall have first been approved. Devices orassemblies shall be tested in accordance with recognizedstandards or other approved standards. Backflow preven-tion devices and assemblies shall comply with Table ,except for specific applications and provisions as stated inSections through or assemblies installed in a potable water sup-ply system for protection against backflow shall be main-tained in good working condition by the person or personshaving control of such devices or assemblies.

10 The devicesor assemblies shall be tested at the time of installation,repair, or relocation and not less than on an annual schedulethereafter, or more often where required by the AuthorityHaving Jurisdiction. Where found to be defective or inoper-ative, the device or assembly shall be repaired or device or assembly shall be removed from use or relo-cated, or other device or assembly substituted, without theapproval of the Authority Having shall be performed by a certified backflowassembly tester in accordance with ASSE Series Backflow Prevention Devices, Assemblies,and Air minimum air gap to affordbackflow protection shall be in accordance with Atmospheric Vacuum Breaker (AVB).