Household plumbing includes the approach of pipes, furniture

https://profdev-lms.tlos.vt.edu/eportfolios/1034/home/why-a-plumber-should-be-hired-for-home-leaks

Household plumbing includes the method of pipes, furnishings, and fittings established for water distribution and waste removal in residential homes. Proper protection guarantees successful operation and prevents high priced maintenance.