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Sampling and analysis under the fourth Unregulated Contaminant Monitoring Rule

Sampling of large (>10,000 users) and randomly selected small Public Water Systems (PWSs) for constituents under the third Unregulated Contaminant Monitoring Rule (UCMR3) was performed in 2013, 2014, and 2015. This sampling included 1,4-dioxane and six perfluorinated compounds (including perfluorooctanoic acid [PFOA] and perfluorooctane sulfonate [PFOS]), which are “emerging contaminants” that are currently a concern to many communities. When emerging contaminants are detected, it often results in a search for the source(s) of the contaminants as well as treatment to protect the users of the water supply. OBG is actively engaged with the treatment of large and small PWSs impacted by emerging contaminants.

The U.S. Environmental Protection Agency (USEPA) finalized the fourth UCMR in December 2016. This rule requires the sampling of large and randomly selected small PWSs for 30 constituents in 2018, 2019, and 2020. The analytes were selected by the USEPA from the fourth Candidate Contaminant List (CCL4), and include 10 cyanotoxins, three haloacetic acids (HAAs), eight pesticides, a pesticide manufacturing byproduct, three alcohols, three semi-volatile organics, and two metals. The analytical results for the UCMR4 sampling are submitted to the USEPA throughout the data collection process, and are made available for download by interested parties.

Will data be collected for the PWS that serves your community?

For more information about UCMR4, including the analyte list, visit the USEPA's website.

About Paul Hare, CPG, PG: Paul is a Senior Technical Director within the Applied Sciences group at OBG, and co-leads the company’s Emerging Contaminants team, which is currently focused on 1,4-dioxane and perfluorinated compounds. He has over 30 years of experience as a hydrogeologist dealing with complex legacy environmental issues. Paul is an “owner,” having spent 23 years as a Remedial Project/Program Manager in industry before joining OBG. Paul is based out of OBG’s Albany, NY office.

Paul Hare, CPG, PG