In this chapter, unless the context or subject matter otherwise requires:
1. "Board" means the state board of plumbing.
2. "Sewer and water contractor" means any person who installs, plans, and manages the installation and repair of building sewer and water service.
3. "Sewer and water installation" means the installation of building sewer and water service and the repair of existing building sewer and water service.
4. "Sewer and water installer" means any person, other than a sewer and water contractor, who installs and repairs building sewer and water service.