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You can change the location at any time. ROCKFORD, MI — Rockford officials are proud and relieved the city’s municipal drinking water supply has tested free of toxic chemicals used by Wolverine World Wide at the company’s former tannery complex on the Rogue River. That’s because the city switched its water source 18 years ago to a 200-plus-foot deep groundwater well system that pulls from a clay-protected aquifer underneath Tiamo Lane NE. But prior to 2000, the city sourced water from the Rogue River about 300 yards downstream of the Wolverine tannery grounds, where testing in October confirmed groundwater near the riverbank was polluted by extremely high levels of toxic chemicals known as per- and polyfluoroalkyl substances, called PFAS or PFCs.
The chemicals — at the heart of a widespread toxic dumping investigation — are also confirmed in the river downstream of the tannery. Rockford may have been drinking PFAS for years, maybe decades. Unfortunately, officials say there’s no way to know for certain whether Rockford’s water system was distributing toxicants linked to cancer and other ailments.
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The federal government didn’t require utilities to test for PFAS until 2013, and that only applied to water systems larger than Rockford’s 6,000 customer base. However, PFAS researchers say what is known about the chemistry and Rockford’s old water treatment plant indicate city residents probably were drinking some amount of the chemicals after 1958, when Wolverine began using 3M Scotchgard at the tannery.
I’d be very surprised if they weren’t,” said Christopher Higgins, a civil and environmental engineering professor at the Colorado School of Mines who co-authored a 2014 study on the ability of conventional water treatment plants to filter out PFAS chemicals. The study found that standard treatments don’t do the trick. Robust PFAS chemicals are “really a different beast” than most municipal water treatment plants have been forced to deal with before, Higgins said. The possibility of historically contaminated drinking water hasn’t only been discussed in private. Rockford natives have posed the question at public meetings, to which state health officials said, essentially, they can’t travel back in time and test the water.