Unregulated Contaminant Monitoring Rule 4 (UCMR 4)
The final rule "Revisions to the Unregulated Contaminant Monitoring Rule (UCMR 4) for Public Water Systems" was published in the Federal Register on December 20, 2016. UCMR 4 monitoring will take place from 2018-2020, and includes monitoring for 28 chemicals and two viruses. Additional information can be found in the UCMR 4 Basic Information Fact Sheet or at EPA's Water: Unregulated Contaminant Monitoring Rule 4 page.
Under UCMR 4, public water systems or EPA will conduct sampling and analysis for Assessment Monitoring for the following:
Additional Contaminants (Metals, Pesticides, Alcohols amd Semivolatile Chemicals)
EPA List of Laboratories Approved for UCMR 4 Analysis - Laboratories that met the approval program application and proficiency testing criteria.