Electrochemical Noise corrosion monitoring was used to validate the use of on-line monitoring to meet the requirements of the US Environmental Protection Agency Lead and Copper Rule for corrosion control in potable water distribution systems. Flow loop systems were installed at four utilities with probes containing copper electrodes, steel electrodes, or lead electrodes. The loops were operated for times varying from five weeks to four months. At some locations, the effectiveness of either zinc
orthophosphate or blended orthophosphate corrosion inhibitor was tested. After testing, the electrodes were analyzed for weight loss and inspected micrographically. This report details the results from one
of these tests and correlates calculated pitting index to post-test inspection.