The City of Traverse City was required to submit a preliminary distribution system materials inventory (PDSMI)
to the Michigan Department of Environment, Great Lakes and Energy (EGLE) by October 16, 2024. A result of
the PDSMI was the summation of the number of water service lines in the City’s water supply system in which
the piping material is unknown.
As required by the amended lead and copper provisions of the Michigan Safe Drinking Water Act (MI-SDWA),
each water supply system is required to submit a Complete Distribution System Materials Inventory (CDSMI)
to EGLE by October 16, 2024. As part of the CDSMI, water supplies must develop an inventory of their water
service lines that “characterizes and documents water service line materials and provides demonstration through
physical verifications that the inventory is accurate”. The Michigan Department of Environment, Great Lakes
and Energy (EGLE) has recently provided documentation entitled “Minimum Service Line Material Verification
Requirements” which sets forth parameters by which water supplies will need to define their WSL materials and
the process for quantifying and identifying a “randomly selected sample” of WSLs that, at a minimum, will
require physical verification.
