Perfluoro Compounds

On June 15, 2011, the TCEQ derived oral reference doses (RfDs) for sixteen PFAS. Later, the TCEQ updated these values to reflect changes in the 2012 revision of the TCEQ Guidelines to Develop Toxicity Factors (RG-442), which were subsequently updated again in 2015. With this 2023 update, the TCEQ is adopting RfDs recently derived by EPA’s IRIS program for perfluorobutyric acid (PFBA) and perfluorohexanoic acid (PFHxA).