There is widespread concern with the problem of pinhole leaks in drinking water plumbing resulting from copper corrosion. Information on pinhole leak incidence and costs can be used to assist in assessing the need for corrective action to reduce pinhole leaks. Several national surveys were conducted to assess rates of pinhole leaks and costs of resulting damages as well as corrosion prevention strategies by utilities. Total estimated annual damage to residential and commercial buildings plus costs of corrosion prevention by utilities in the U.S. is approximately $967 million of which $564 million is damage to homes and $222 million is cost of corrosion prevention by utilities. Improving the ability to detect hot spots having high leak rates and the causes of leaks in hot spot areas and developing strategies to prevent leaks will have large benefits to consumers. Includes 14 references, tables.