May 2025: Miriam Vale (Queensland)
“In May 2025, GRC undertook monitoring for PFAS in the raw water sources for Miriam Vale and Bororen. PFBS, PFPeS, PFHxS and PFOS were detected. Results were below ADWG health limits for PFHxS and PFOS, however no guidelines currently exist for PFBS or PFPeS.
Repeat samples were collected from both raw water sources as well as the Miriam Vale WTP treated water. Detections were of a similar magnitude to the original detections, however one compound was detected in one of the two Miriam Vale WTP Treated Water samples (PFTeDA) that was not found in Thorne’s Road bore. The result of 0.0006µg/L was only marginally above the limit of reporting (0.0005µg/L) and results are increasingly uncertain when detected at levels approaching the LOR. Noting that it was only detected in one of the two duplicate samples, and not in either raw water sample, there is believed to be a high chance that the result is not real.
Treated water results met all health limits in the recently revised ADWG. Queensland Health provided advice that the result for PFTeDA was not of significant concern.”
Gladstone Regional Council Drinking Water Service Report 2024-2025