Proposed UCMR5

The Environmental Protection Agency (EPA) posted a pre-publication version of the proposed Unregulated Contaminant Monitoring Rule 5 (UCMR5).   The proposed monitoring includes 29 PFAS and lithium.  The document was signed by the EPA Administrator on January 14, 2021 and sent to the government printing office for publication in the Federal Register.

Once the UCMR5 is published in the Federal Register there will be a 60-day public comment period.

Required monitoring would be one year of quarterly monitoring for surface water and groundwater under the direct influence of surface water systems, and two samples in a 12 month period for groundwater systems.  EPA is proposing that PFAS would be measured using EPA Methods 533 and 537.1.  EPA anticipates the monitoring would occur during 2023 to 2025.

EPA statement from the document: “This document also describes EPA’s evaluation of other candidate contaminants, including Legionella pneumophila; four haloacetonitriles (dichloroacetonitrile, dibromoacetonitrile, trichloroacetonitrile, and bromochloroacetonitrile); 1,2,3-trichloropropane; and “total organic fluorine” (TOF), and invites public comment.”

Copy of the pre-publication version of the UCMR5 and a draft Fact Sheet are here (prepublication-proposed-revisions-ucmr5 ucmr5-proposal-factsheet-draft ).