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<br />t-rem-sf2-03 · 3/14/17 <br />January 8, 2025 <br /> <br /> <br /> Goose Lake Rd <br />St Paul, MN 55110 <br /> <br />RE: Residential Well Sampling Results <br /> Located at Goose Lake Rd <br /> <br />Dear <br /> <br />Your well was sampled to define the concentration of per- and polyfluoroalkyl substances (PFAS), and <br />1,4-dioxane. <br /> <br />The recent sample from your well contain the following compound(s): <br /> <br />Chemical <br />Amount found <br />(in parts per billion) <br />11/07/2024 <br />MDH health- <br />based value <br />(in parts per billion) <br />1,4-Dioxane Not Detected 1.0 <br />PFBA <br />PFBS <br />PFHpA <br />PFHxA <br />PFHxS <br />PFMPA <br />PFOA <br />PFPeA <br />PFPeS <br />0.0851 <br />0.00176 <br />0.00315 <br />0.0118 <br />0.00273 <br />0.000502 J <br />0.00437 <br />0.0228 <br />0.00143 <br />7.0 <br />0.1 <br />NE <br />0.2 <br />0.047 <br />NE <br />0.0000079 <br />NE <br />NE <br />J = Estimated result with minimal impacts; data is considered usable and valid. <br />NE = A health-based value has not yet been established. <br /> <br />There were detections of PFAS in your well water. There was an exceedance of MDH health-based <br />guidance for PFOA in your well water. Therefore, the MPCA recommends that your well water should <br />not be used for drinking or cooking. The detections that were present in your well water are listed in <br />the table above and compared to the MDH health-based guidance values. A copy of the laboratory <br />report for your well has been included with this letter. <br /> <br />Drinking water with levels of PFAS and/or 1,4-dioxane at or below health-based guidance over a lifetime <br />is considered safe. These limits are also designed to be protective of the developing fetus, infants, <br />children, or people who may drink more water than the average person, such as a nursing mother. The <br />limits also take into consideration that people may be exposed through other pathways in addition to <br />drinking water. <br /> <br />Filters containing activated carbon or reverse osmosis membranes have been shown to be effective at <br />removing PFAS from water. However, these filters are not as effective in removing 1,4-dioxane. Other <br />types of common water treatment systems, such as water softeners, are not likely to remove PFAS or <br />1,4-dioxane. Additional information can be found at the MDH website. <br />