Plumbing Board final interpretations

The state Plumbing Board is charged with interpreting the code. Below are final interpretations issued by the board.

• PB0225 – Horizontal wet venting (Feb. 24, 2026)

• PB0223 – Horizontal wet venting (Feb. 24, 2026)

• PB0196 – Building supply (April 15, 2025)

• PB0183 – Equivalent sweep (Oct. 15, 2024)

• PB0172 – Island venting (July 16, 2024)

• PB0162 – Water conditioning installation (April 16, 2024)

• PB0160 – Storm drainage piping (Nov. 6, 2023)

• PB0159 – Storm drainage surcharge (Feb. 10, 2023)

• PB0158 – Suds-producing fixtures (Jan. 17, 2023)

• PB0157 – Water hammer arrestor (Jan. 17, 2023)

• PB0156 – Section 611.5, isolation and bypass requirements for water conditioning installations (July 19, 2022)

• PB0154 – Section 1017, oil and flammable liquid interceptors (Jan. 25, 2022)

• PB0152 – Section 603.5.19, pure water systems (July 27, 2020)

• PB0141 – Section 709.1, drain by gravity (Oct. 15, 2019)

• PB0098 – Atmospheric vacuum breaker (Oct. 8, 2018)

• PB0096 – Exterior sump and receiving tank (Aug. 28, 2018)

• PB0092 – Double check assembly with an atmospheric vent for a domestic water connection serving a combi-oven (Oct. 9, 2017)

• PB0088 – Double check backflow prevention assemblies (DC) and double check detector fire protection backflow prevention assemblies that are an integral part of a fire protection system (March 20, 2017)

• PB0085 – Use of polyethylene piping for building supply piping (June 15, 2016)

• PB0083 – Air gap fittings and drainage from domestic dishwashers (May 11, 2016)

• Definition of "Building Supply" (May 11, 2016)

• Exterior venting (May 22, 2014)

• Low pressure hazard (Sept. 16, 2013)

• Basic plumbing principles and the installation of fixtures (Sept. 13, 2013)

• Single-wall heat exchangers (Feb. 11, 2013)

• Flexible piping and water distribution systems (Feb. 11, 2013)

• Oil and flammable liquid separator (Sept. 11, 2012)

• Sump pumps and discharge piping (March 14, 2011)

• 35-foot limitation on horizontal plastic piping (March 14, 2011)

• ASSE Standard 1017 certified valves (Aug. 18, 2010)

• Sizing of building drains and branches (May 11, 2009)

Submit a request to the Plumbing Board

Request for Interpretation form

Questions?

Contact us at dli.ccldboards@state.mn.us.