Requires the state building code council, by no later than the first building code update after January 1, 2020, to adopt rules to require all new buildings constructed in certain cities to reuse greywater in a manner consistent with the standards, procedures, and guidelines adopted by the department of health.

Requires the department of health to update the adopted standards, procedures, and guidelines to allow for the reuse of greywater for water use needs of a building, including heating and cooling and the flushing of toilets.