(a) All plumbing fixtures in a dwelling structure shall be supplied with running water from the municipal water supply system.
(b) Every dwelling unit shall have an approved supply of running hot water properly connected to all plumbing fixtures normally requiring hot water.
(c) All plumbing fixtures in a dwelling structure shall be so designed and installed as to prevent contamination of the water supply system.
(d) All plumbing fixtures in a dwelling structure shall be connected to a public sanitary sewer.