PFAS Items: FDA Food Survey, PFBA Tox Assessment

A couple of items regarding PFAS that may be of interest:

FDA National Food Survey: Earlier today the US Food and Drug Administration (FDA) released the results of a national survey for PFAS in processed foods.

From the FDA press released: “Results of this survey showed that 164 of the 167 foods tested had no detectable levels of PFAS. Three food samples collected as part of the FDA’s latest testing effort had detectable levels of PFAS: fish sticks, canned tuna and protein powder….the FDA has no scientific evidence that the levels of PFAS found in the samples tested indicate a need to avoid any particular food in the food supply.”

Here are the FDA’s reported results for 16 tested PFAS ( Analytical Results for PFAS in 2021 Total Diet Study Sampling (Parts Per Trillion)_Dataset 4_0).

Link to FDA Press Release:

https://www.fda.gov/news-events/press-announcements/fda-releases-pfas-testing-results-first-survey-nationally-distributed-processed-foods

EPA IRIS Health Risk Assessment for PFBA

A series of five PFAS assessments (PFBA, perfluorohexanoic acid [PFHxA], perfluorohexane

sulfonate [PFHxS], perfluorononanoic acid [PFNA], perfluorodecanoic acid [PFDA], and their associated salts; is being developed by the Integrated Risk Information System (IRIS) Program at the request of US EPA.

This week, EPA released the draft IRIS Health Risk Assessment for PFBA for a 60-day public comment period.  A copy of the Federal Register announcement and the draft PFBA Health Risk Assessment are here (Fed Reg_Review PFBA IRIS Health Assess_2021-08-23 PFBA_TOXREVIEW_EXTERNAL_REVIEW_AUG_2021  ).  In the Executive Summary, based on the review of available health effects studies, Table ES-1 presents a chronic (non-cancer) Reference Dose (RfD) of 1×10-3 mg/kg-day (based on liver and thyroid effects) for PFBA.  If that RfD value were to be used by EPA to develop a drinking water regulation, a possible calculation of the Maximum Contaminant Level Goal (MCLG) would be as follows:

MCLG = (RfD x body weight x Relative Source Contribution) divided by (drinking water daily intake).

EPA typically uses 70 kg for the body weight of an adult, 20% (0.2) for the Relative Source Contribution and 2 L/day for drinking water intake.  There is no indication at present that EPA is considering developing an MCLG or MCL for PFBA.

In the same Federal Register (enclosed) EPA is requesting nominations for an IRIS Peer Review Panel to review the health risk assessments of PFBA and the other four PFAS listed above.

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About Dan Askenaizer

Dr. Askenaizer leads WQTS’ work on regulatory compliance support for many of our water agencies clients. Dr. Askenaizer tracks water quality and treatment regulations at the Federal and State levels and provides regulatory updates to our clients. Dr. Askenaizer has strong expertise in the development of Regulatory Monitoring and Compliance Plans (RMCPs), which he has completed for a number of water agencies. He has also been working on a number of projects dealing with the development of distribution system monitoring plans and review of nitrification control strategies. Prior to joining WQTS, Dr. Askenaizer was the Water Quality Manager for the Glendale Water and Power. Under his leadership, the Water Quality Group conducted a demonstration-scale study of chlorite for nitrification control and a pilot-scale study of biological treatment for removal of nitrate. Dan has 30 years of experience working on projects dealing with regulatory, water quality and public health issues. Dan has given numerous presentations at workshops and round-tables across the country for water utilities. Dan was instrumental in developing and implementing a Mentoring Program for water staff and was involved in a Sustainable Development team.