Tom Neltner, Chemicals Policy Director.
Earlier this year, the Michigan Department of Environment, Great Lakes, and Energy (EGLE) released ground breaking guidance to help utilities in the state develop their “Complete Distribution System Materials Inventory” (CDSMI) that is due in 2025. The guidance is important because it explicitly allows utilities to use predictive tools to prepare an accurate materials inventory that is essential to effective lead service line (LSL) replacement efforts. Because the Environmental Protection Agency’s (EPA) service line inventory in its revised Lead and Copper Rule (LCR) has many elements in common with Michigan’s inventory, we encourage EPA and other states to look closely at Michigan’s guidance as a model to help all utilities develop accurate service line inventories.
Michigan’s inventory requirement and guidance
Michigan’s version of the LCR requires utilities to fully replace all LSLs – the portion on both public and private property – at an average rate of 5% per year by 2040.[1] The key to compliance is an accurate CDSMI that must be submitted to EGLE and made public by January 1, 2025.
EGLE states that the CDSMI’s purpose “is to characterize, record, and maintain a comprehensive inventory of distribution system materials, including service line materials on both public and private property.” It supports effective asset management planning, LSL replacement efforts, and notification of those served by an LSL.