The data comes from Architecture, Engineering, Construction, Operations, and Management (AECOM) (State of Michigan contractor) who are collecting and submitting the samples to certified drinking water PFAS laboratories.The data was collected using AECOM's Environmental Quality Information System (EQuIS) database tools.The data represents the PFAS sample locations, with each location having multiple samples taken, dates for each sample, and the analytical results for each sample. These analytical results include detections for 14 - 28 PFAS analytes, depending on the analytical method used. Each result has a "flags" column that corresponds to important data qualifiers.Understanding the flags: Contaminant data often include flags, also known as qualifiers, which are notes attached to data that gives detailed information about that particular result. In the drinking water PFAS data layer, PFAS analytes associated with a "U" flag were not detected in the sample and therefore a null value is displayed. "J" flagged results indicates an estimated concentration as the result is above the minimum detection limit (MDL) but below the laboratory reporting limit. "J-" flagged results indicates an estimated concentration as the result is above the minimum MDL, below the laboratory reporting limit, but biased low. "UJ" flagged results indicates a not detected at the value estimated reporting limit. "R" flagged results indicates a rejected sample as serious quality control issues render the result value bot usable. "*" flagged results indicates that the result values have not been verified.The locations that have been sampled in this effort include Community Water Supplies (including regional and municipal water supplies, manufactured housing communities, residential apartment buildings, etc.), Nontransient Noncommunity Water Supplies (including schools, businesses, childcare providers, Michigan Head Start locations, motels, resorts, etc.), and Transient Noncommunity Water Supplies (children's camps and medical care providers).Understanding the "SystemType" field: See table below. Non-community water supplies are considered "Type I" (serves 25+ people 6 months out of the year) and Community water supplies are considered"Type II" (serves 25+ people year-round).ADFSTC: Non-Community Water Supply (Adult Foster Care Provider)CHLCMP: Non-Community Water Supply (Children's Camp)DAYCARE: Non-Community Water Supply (Child Care Provider)INDUS: Non-Community Water Supply (Industry)MEDCAR: Non-Community Water Supply (Medical Care Provider)MOTEL: Non-Community Water Supply (Hotel or Motel)MUN: Community Water Supply (for example Municipal Supply, Apartment, Nursing Home, Prison, etc.)This contains one hexbins layer (3 miles in height) showing the general location of the water sampling. The hexbins were created by EGLE using ArcGIS Online'sAggregate Points tool. The layer contains one field called "Hexagon ID" that connects the general location with the results of samples found within the hexbin area. The results are found in a related table "Statewide Testing Initiative of Public Water SuppliesSampling Results". There is no precise location attached to the results for security. However, the table does contain a field "Hexagon ID" that connects the the result with the general location symbolized by the hexagon layer.This data is used intheMPART: PFAS Geographic Information System(item details). For more information about Michigan's PFAS response, please visit ourState of Michigan PFAS Response website.Call 800-662-9278 for assistance with reading or interpreting this data. Questions regarding the drinking water sampling PFAS data can be directed toLisa Dygert (DygertL@Michigan.gov).To submit feedback on the data, please reach out toEGLE-Maps@Michigan.gov.Update Information: This data is static and was last pulled 10/29/21. This metadata was updated 01/06/2022 to change the name to "Statewide Testing Initiative of Public Water Supplies".
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