showerheads

In the United States, the standard showerhead has a ½ inch female NPT thread.

Flow

In the United States, the Energy Policy Act of 1992 set a limit of 2.5 gallons per minute. In 2010, the maximum permitted flow rate was reduced to 2 gallons per minute (7.6 liters per minute).

for further reading

The Fed's rulings and reasoning can be examined at:

https://www.epa.gov/watersense/watersense-specification-showerheads-supporting-statement

http://www.map-testing.com/content/info/menu/showerheads.html

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