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SB 504
Michigan Senate•In Senate Committee
Summary
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”, was introduced in the Senate on Aug 14, 2025 by Sen. Dayna Polehanki (D) with 7 co-sponsors. It last saw action on Mar 11, 2026: Referred To Committee Of The Whole With Substitute (s-1).
Record
Text
SB 504 has 7 co-sponsors and 1 roll call.
sb504/introduced.txtSENATE BILL NO. 504A bill to amend 1976 PA 399, entitled"Safe drinking water act,"by amending section 5 (MCL 325.1005), as amended by1998 PA 56, and by adding section 6a.the people of the state of michigan enact:Sec. 5. (1) The department shallpromulgate and enforce rules to carry out this act pursuantto in accordance with the administrativeprocedures act of 1969, 1969 PA 306, MCL 24.201 to 24.328. The rules, at aminimum, shall mustinclude the following:(a) Requirementsfor the submission of reports, plans, and specifications for the design andconstruction of all or a part of a waterworkssystem, or a partthereof, and a plan for operating and maintaining all or a part of the a waterworkssystem, including the protection of water quality within the distributionsystem as necessary to protect the public health.(b) State drinkingwater standards and associated monitoring requirements, the attainment andmaintenance of which are necessary to protect the public health.(c) Theclassification of all or a part of a waterworkssystems or portions thereof, system, the examination for certification of theoperators of those waterworkssystems including shift operators of water treatment systems, and forthe issuance, suspension, and revocation of certificates.(d) Criteria forcapacity assessments performed by the department at community supplies,nontransient noncommunity water supplies, or a public water supply applying tothe department for assistance under part 54 of the natural resources andenvironmental protection act, 1994 PA 451, MCL 324.5401 to 324.5418.(e) Requirementsfor provision of facilities by public water supplies that will assure ensure anadequate and reliable supply of drinking water on a continuous basis.(f) Requirements for the establishment and administration of themicroplastics program created in section 6a.(2) Rules governingpublic water supplies promulgated under former 1913 PA 98 , and which that were in effect on January 4, 1977 are continuedin accordance with section 31 of the administrative procedures act of 1969,1969 PA 306, MCL 24.231, and may be amended or rescinded by the director underthis act.(3) No rulepromulgated may require the addition of any substance for preventive healthcare purposes unrelated to contamination of drinking water.Sec. 6a. (1)Beginning July 1, 2027, and continuing until July 1, 2030, the department shallestablish and administer a microplastics program to establish microplasticbaseline conditions in public water supplies. As part of the microplasticsprogram, the department shall monitor and test public water supplies on aquarterly basis using sampling and analytical methods consistent with methodsused or described by the International Joint Commission, the American Societyfor Testing and Materials, the United States Environmental Protection Agency, theAmerican National Standards Institute, the state of California, or bestavailable methods or technology. The microplastics program is intended toprovide for a preliminary risk assessment to study the effects of microplasticsin drinking water. Under the microplastics program, the department shallconsider all of the following:(a) Shoreline surface water drinking water sources from the Great Lakes.(b) Major tributaries that support public water supplies.(c) Inland surface water lakes that provide drinking water.(d) Direct use of groundwater for drinking water within and nearagricultural operations.(e) Use of groundwater or drinking water within 1 mile of a landfilloperation.(f) The size of the public water supply.(g) Impacts on environmental justice.(h) Quarterly sample collection and analysis.(2) Not later than July 1, 2031, the department shall prepare and submita report to the standing committees and the appropriations subcommittees of thesenate and house of representatives with primary responsibility for issuesunder the jurisdiction of the department and make the report available on thedepartment's website. The report must include the following:(a) A summary of findings, including, but not limited to, all of thefollowing:(i) Reports ortechnical memoranda that provide a summary of each quarterly test describedunder subsection (1), including, but not limited to, the following information:(A) Drinking water source, location, and description.(B) Sampling date.(C) Testing methodology.(D) Microplastic shape, if available.(E) Potential microplastic sources.(F) Polymer type, if available.(ii) The quantitiesof microplastics in public water supplies, including the quantities in thewater source that supplies the public water supply.(b) Recommendations for next steps for addressing the effects andpresence of microplastics in public water supplies, including, but not limitedto, the following:(i) The toxicitylimit of microplastics based on best available, peer-reviewed research ortoxicity studies and findings of the United States Environmental ProtectionAgency.(ii) A preliminaryrisk assessment.(iii) An overview offindings and critical issues.(iv) Recommendationsfor continued and expanded monitoring and analysis and public protection.(3) As used in this section:(a) "Microplastics" means a solid plastic material that has atleast 3 dimensions, measures less than 5 millimeters in size, and may containchemical additives or other substances. Microplastics do not include naturallyoccurring, non-chemically modified polymers.(b) "Plastic" means synthetic material composed of organicpolymers produced by linking monomers through a chemical reaction and mayinclude chemical additives or other substances. Plastic does not includenaturally occurring, non-chemically modified polymers.
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.
Sponsors
Sen. Dayna Polehanki (D) sponsors SB 504, and 7 members have co-sponsored it.
Committees
SB 504 went before 1 committee: Natural Resources And Agriculture.
History
SB 504 has taken 4 actions since Aug 14, 2025, the latest on Mar 11, 2026.
| Chamber | Action | |||
|---|---|---|---|---|
Mar 11, 2026 | Senate | Reported Favorably With Substitute (s-1) 3/10/2026 | ||
Mar 11, 2026 | Senate | Referred To Committee Of The Whole With Substitute (s-1) | ||
Aug 14, 2025 | Senate | Introduced By Senator Dayna Polehanki | ||
Aug 14, 2025 | Senate | Referred To Committee On Natural Resources And Agriculture |
Votes
SB 504 went to 1 roll call in the Senate, the latest on Mar 11, 2026 at 4–2.
| Chamber | Question | Yea | Nay | |||
|---|---|---|---|---|---|---|
Mar 11, 2026 | Senate | Reported Favorably With Substitute S-1 3/10/2026 | 4 | 2 |
Source: legislature.mi.gov · legiscan.com