On Jan. 1, the 2016 editions of the California Plumbing Code and California Mechanical Code went into effect in the state. These editions represent the most current approaches in the plumbing and mechanical fields, IAPMO notes. These codes are embedded within the 2015 editions of the Uniform Plumbing Code and Uniform Mechanical Code with California amendments.

Key changes to the 2016 CPC include:

  • New product standards and flow rates for plumbing fixtures and fixture fittings;

  • Lead-content provisions have been revised to address the minimum acceptable percentage of lead content for pipes and fittings;

  • New provisions for residential fire sprinkler systems; and

  • New requirements for the insulation of hot water piping.


Key changes to the 2016 CMC include:

  • New general requirements for condensate wastes and control, installation of appliances on sloped roofs and clearances to combustible constructions;

  • New ventilation provisions such as the classification of recirculated and transferred air, parking garages exhaust and natural ventilation; and

  • New appliance provisions for items such as electric duct heaters, electric ranges, refrigeration appliances and ductless mini-split systems.