103rd Legislature (2025 to 2026) · State Senate bill

SB 504

Water supply: quality and standards; testing and reporting of the amount of microplastics in public drinking water supplies; require. Amends sec. 5 of 1976 PA 399 (MCL 325.1005) & adds sec. 6a.

In committee Last action March 11, 2026: REFERRED TO COMMITTEE OF THE WHOLE WITH SUBSTITUTE (S-1)

Official bill page and text: legislature.mi.gov

Sponsors 8

Prime sponsor

Dayna Polehanki

Cosponsors (7)

Darrin Camilleri, Jeff Irwin, Mallory McMorrow, Mary Cavanagh, Rosemary Bayer, Stephanie Chang, Sue Shink

Status

In committee as of March 11, 2026. The 103rd Legislature serves until the 104th convenes on January 13, 2027.

Referred to: Senate Natural Resources and Agriculture (from the official referral record)

Roll-call votes 0

No roll-call votes recorded for this measure.

Timeline 4

Date	Chamber	Action
March 11, 2026	Senate	REFERRED TO COMMITTEE OF THE WHOLE WITH SUBSTITUTE (S-1)
March 11, 2026	Senate	REPORTED FAVORABLY WITH SUBSTITUTE (S-1) March 10, 2026
August 14, 2025	Senate	REFERRED TO COMMITTEE ON NATURAL RESOURCES AND AGRICULTURE
August 14, 2025	Senate	INTRODUCED BY SENATOR DAYNA POLEHANKI

Data: Open States (API v3; public data, attribution appreciated). Official record: legislature.mi.gov. Bill pages link to the official text, not copied.