Showerhead Leaks
A showerhead leaking at 10 drips per minute wastes more than 500 gallons per year. That's the amount of water it takes to wash 60 loads of dishes in your dishwasher. Some leaky showerheads can be fixed by making sure there is a tight connection between the showerhead and the pipe stem and by using pipe tape to secure it. Pipe tape, also called Teflon tape, is available at most hardware stores, is easy to apply, and can help control leaks. For more complicated valve leaks in showers that drip when not in use, contact an experienced handyperson or licensed plumber.
Tip: It's also a good idea to check and, if needed, replace the washer or "o" ring inside the showerhead while making this repair.
https://www.epa.gov/watersense/fix-leak-week