Frequent Questions

Where should property managers go for information about general requirements or best practices for flushing residential water systems? How often is it recommended to flush these systems and how many gallons of water is estimated to be used in the flush?

The EPA does not have published requirements or guidelines for flushing of residential plumbing systems. Flushing of residential plumbing systems would need to consider the volume of water in the plumbing system, the flow of water through the plumbing as well as the purpose of the flushing.

Individual residence would need to be measured or estimated. For example, if the purpose of the flushing was to replace all the water in the plumbing system that had not been used for some period with water from the water utility main, the length and diameter of the water service line and pipes in the building would need to be measured or estimated and that information would be converted to the total volume of water, in gallons, in the plumbing system.  The flow of water, in gallons per minute, from the faucet or hose bib used for flushing, would need to be measured. Dividing the measured volume by the measured flow would provide an estimate of the time

Dividing the measured volume by the measured flow would provide an estimate of the time necessary to replace the volume of water in the household plumbing with water from the water utility main.

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