Madison Metropolitan Sewerage District recently shared the results of its Phase 2 sampling and analysis of PFAS, or per- and polyfluoroalkyl substances, in the local wastewater cycle.
The District has a comprehensive PFAS sampling and analysis plan and is committed to continuing its testing efforts for the foreseeable future.
To review results from the first two phases of the District’s sampling program, click on the relevant button below.
As outlined in the sampling and analysis plan, the District is taking a phased approach to testing, with these initial results informing next steps in the testing process.
Click each toggle for information regarding what the District will investigate in the next round of testing.
What effects do certain treatment processes have on PFAS transformations and partitioning within the plant? Answering this question will also require further characterization of the sample points in phase one to focus on mass changes of PFAS within the treatment plant processes.
What are the differences in the amount of PFAS in the Class A biosolids versus Class B biosolids. Answering this will involve additional characterization of the biosolids sample points in phase one to determine why different biosolids products differ in the amount of PFAS.
Do certain areas of the collection system contribute more PFAS than others? This will involve additional examination of influent data from the five force mains entering the plant and determine if additional pump station investigation and sampling is warranted.
Through 2022, the District was engaged in phase 2 of its PFAS sampling plan. This provides preliminary results for PFOA and PFOS, two PFAS compounds.
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