MADISON (WKOW) — The Madison Water Utility found PFAS compounds in four additional pumping stations, bringing the total number of wells with detected PFAS compounds to 14, the department said in a press release Friday.

Well 23 on Leo Drive contained the PFAS compounds PFOA and PFOS at a combined measurement of 6.6 parts per trillion. The Wisconsin Department of Health Services (DHS) recommends a groundwater standard of 20 parts per trillion for the two PFAS compounds.

The utility last pumped well 23 in the summer of 2017.

Wells 8, 17 and 27, by contrast, all tested with trace amounts of PFAS compounds, meaning they were at amounts so low they could not be accurately quantified.

Wells 6, 7, 9, 11, 13, 14, 15, 16, 26 and 29 all previously had measured to contain PFAS compounds in at least trace amounts, bringing the total number of pumping stations with PFAS to 14. None exceed the 20 ppt DHS recommendations.

The water utility to said it plans to test all city wells again in 2020.