Beginning January 1, 2018, all new multi-family construction (defined as two or more units) that apply to a water purveyor for water connection must include water submeters for each individual unit. At the same time, if an owner has a building constructed before January 1, 2018, and he or she elects to install submeters or already has submeters, the disclosure and billing requirements in the state law must be applied when billing tenants for water.