Josie Taylor | May 5, 2022
The treated drinking water of West Des Moines no longer has detectable amounts of PFAS, commonly called “forever chemicals.” West Des Moines Water Works shut down a contaminated well in 2021 after finding troubling levels of PFAS.
Initial tests of West Des Moines water in November showed it contained the two prominent PFAS in a combined concentration of 5.3 parts per trillion. A subsequent test in March did not detect either. Those tests can detect concentrations as small as 1.9 parts per trillion.
“We were pleased to see that,” said Christina Murphy, general manager of West Des Moines Water Works. “We do everything we can to mitigate the presence of those compounds.”
Two other West Des Moines wells showed contamination in lesser concentrations than the one that was shut down, and the water utility is minimizing its use of them, Murphy said.
Ames stopped using its most-contaminated well after DNR sampling found a combined concentration of 38 parts per trillion, but its treated drinking water appeared unaffected by the change. Initial tests of the treated water showed it had the two PFAS in a combined concentration of 9.6 parts per trillion in December. In March, it was 10 parts per trillion.
The state is requiring water supplies to test their finished drinking water quarterly if they have detectable amounts of PFAS.