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What is the difference between water service pipe and water supply pipe?
Thursday, September 20, 2018
Water service pipe connects at the house side of the water meter and runs across the yard to a point near where the water enters the home. There is sometimes a shut-off valve at this point, and the piping that runs inside the home distributing water to the plumbing fixtures is called water supply pipe. Another name for water pipes inside the home is water distribution pipe—which is the name used in the International Residential Code. Here is how the two are defined in the IRC:
Water Service Pipe - The pipe from the water main or other source of potable water supply, or from the meter when the meter is at the public right of way, to the water distribution system of the building served.
Water Distribution Pipe - A pipe within the structure or on the premises that conveys water from the water service pipe, or from the meter when the meter is a the structure, to the point of utilization.
The pipes that drain the sinks, tubs and toilets are the wastewater piping. Unlike supply piping, it is not pressurized, and requires vents that admit air to the system in order to drain properly.
There are two types of water supply pipes have proved to be problematic over the years: galvanized steel and polybutylene. Polybutylene is no longer code-approved due to premature failure of the material, and galvanized steel is not used for new installations due to corrosion buildup.
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