GPA Review – December 2025 Update

Stage 1 of the EPA’s review of the Edwardstown GPA started in May 2025 to investigate the extent of groundwater contamination. New groundwater monitoring wells were installed, and new and existing wells were sampled to better understand levels of CHC contamination in groundwater.

This assessment was completed in September 2025 and found that groundwater deeper than the depths prohibited by the GPA is contaminated by TCE, and that contamination extends further to the west than the current GPA boundary.

The Stage 1 assessment report – September 2025 is now available.

Next steps

The EPA will start further assessment in mid-2026 to continue investigating the extent of contamination. This will include a new environmental assessment in Park Holme, to the west of the existing GPA, as well as more drilling and testing in the existing GPA to find how deep the contamination is within the groundwater system.