Pinhole Leaks in Copper Pipes

Most of this data is based on 4,850 reports from customers (out of 400,000 accounts) who have experienced copper pipe pinhole leaks. Although we continue to receive more reports, the data continues to show the same patterns and trends.

Orientation of Copper Pipe in House where Pinhole Leaks were Found

Frequency of Copper Pipe Pinhole Leaks by Pipe Diameter

Copper Pipe Service (Hot or Cold Water) where Pinhole Leaks were Found

Copper Pipe Pinhole Leaks Reported by Community

Copper Pipe Pinhole Leaks Reported by Local Zip Code

Leaks per 1000 Customers

Clean & Line Water Main Maintenance Activity and Pinhole Leak Reports (Based on 2,831 reports)

     Prince George's County          Montgomery County

As part of our copper pipe pinhole leak investigation, we are researching our clean & line water main maintenance activity to see if there are possible connections to reported pinhole leaks. Thus far, we have found that nearly 70 percent of the pinhole leaks reported to us are from areas that have not had mains cleaned & lined, or, just over 30 percent are from areas that have had this maintenance activity. Click on either County to view map, broken down by year, of clean & line activities and copper pipe pinhole leak reports.

What can you do?

Turn off your water when away from home for extended periods of time.

Examine accessible copper piping for small, bluish-green stains on the pipes – away from joints. This can be an indication of a pinhole leak. Call a licensed plumber immediately at the first signs of leaks. (Bluish-green stains on copper pipes do not necessarily indicate there is a pinhole leak--they can appear on copper pipes in a damp environment, usually in the basement.)

Before purchasing a home, self inspect plumbing (or have licensed plumber do so), ask about the plumbing history and ask, if applicable, how long the house has been vacant.

You can purchase pipe clamps from any hardware store and install them over pinholes to stop leaks until repairs can be made.

WSSC Customer Service Representatives can also complete questionnaires over the phone at 1-800-634-8400 or (301) 206-4001.