The Chemistry Behind the Use of Water - in Plumbing. Water plays a pivotal role in any plumbing system- it must be activated in order for it to be useful. Just one of the role of water in plumbing is by heat transference or by cleaning the sanitary system via flushing. Water is vital for domestic cleanliness, with its easy-to-access convenience being a priority. Regardless of the context, water remains a top necessity for keeping households up and running. The scientific term for water is ...