Richard O. Lewis of Lewis Engineering and Consulting Co. offered these “tell-tale signs” of potential problems:
• Rattling of the pipes when a faucet is closed.
• Green stains on porcelain fixtures.
• Sediment buildup in toilet tanks.
• A persistent, strong chlorine smell in the water.
A number of plumbers disagree though, saying that these conditions are linked to plumbing problems other than pinholes.