Michigan Public Water Supply Sampling Hexbins and Results (Consolidated)

Note that this layer contains the same information as Michigan Public Water Supply Sampling Hexbins and Results. They are distinct in structure only (the data is essentially the same). This is a hexbin layer with a related table containing results, while the other is a single flattened file. The data includes information on State of Michigan drinking water Per- and Polyfluoroalkyl Substances (PFAS) compliance sampling, including, but not limited to, sample location, sample date, sample results, etc. The hexbins layer (hexagons are 3 miles in height) show the general location of all samples with the sample results. This data is static and was last pulled 1/12/2026. The units for all drinking water PFAS results are measured in PPT (parts per trillion), equivalent to ng/l. Hexbin data (PFAS test results) for public water supplies come from the PFAS MCL monitoring results for compliance under Michigan’s Safe Drinking Water Act (2020 – present). 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.), and Nontransient Noncommunity Water Supplies (including schools, businesses, childcare providers, Michigan Head Start locations, etc.) Definitions of the information provided in the hexbin polygon layer: Field Description HexID Unique ID for each hexbin polygon Shape_Area Esri create field for the area in square meters Shape_Length Esri created field for the length of the perimeter in meters Definitions of the information provided in the sampling results related table: Please note that the PFAS analytes are listed in individual columns (ppt). These include the 7 regulated PFAS compounds tested under EPA method 537.1. If the results listed is “ND”, the lab did not detect, or find, that PFAS was in the water sample above the method reporting limit. Field Description HexID Unique ID associated with the specific sampling results hexbin System Name Water supply system name WSSN Water Supply Serial Number; unique identifier for each public water supply Sample Date The date samples were taken at the water supply HFPO-DA (Hexafluoropropylene oxide-dimer acid, also referred to as "GenX"); a regulated analyte in Michigan with an MCL = 370 ppt PFBS (Perfluorobutane sulfonic acid); a regulated analyte in Michigan with an MCL = 420 ppt PFHxA (perfluorohexanoic acid); a regulated analyte in Michigan with an MCL = 400,000 ppt PFHxS (perfluorohexane sulfonic acid); a regulated analyte in Michigan with an MCL = 51 ppt PFNA (perfluorononanoic acid); a regulated analyte in Michigan with an MCL = 6 ppt PFOA (perfluorooctanoic acid); a regulated analyte in Michigan with an MCL = 8 ppt PFOS (perfluorooctane sulfonic acid); a regulated analyte in Michigan with an MCL = 16 ppt Sys Sample Code The identification number that corresponds to the sample taken Lab Name Laboratory providing PFAS analysis via EPA menthod 537.1 Location Name Specific sample location, when applicable Lab Number The certified lab code number. Note: LabName indicated values may vary for the same lab (issue with data coming from two different databases). LabNumber will help clarify these cases. <2: Analyte was not detected above the minimum reporting limit (2 ppt). 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 7 PFAS compounds. Results are provided in parts per trillion. A part per trillion (ppt) is the equivalent of 1 drop of water in 20 Olympic-size swimming pools. 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"s Aggregate Points tool. The layer contains one field called "HexID" that connects the general location with the results of samples found within the hexbin area. There is no precise location attached to the results for security. This data is used in the MPART: PFAS Geographic Information System (item details). For more information about Michigan"s PFAS response, please visit our State 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 to [e-mail]. To submit feedback on the data, please reach out to [e-mail].请注意，本图层与密歇根州公共供水采样六边形格网及结果数据集包含完全相同的信息，二者仅结构有所区别（数据本质一致）。本图层为带有关联结果表的六边形格网（Hexbin）图层，而另一数据集则为单一扁平化文件。 本数据集涵盖密歇根州饮用水全氟和多氟烷基物质（Per- and Polyfluoroalkyl Substances, PFAS）合规采样相关信息，包括但不限于采样点位、采样日期、采样结果等。该六边形格网图层（六边形对边间距为3英里）展示了所有带有检测结果的采样点位的大致分布。本数据集为静态数据，最后更新于2026年1月12日。 所有饮用水PFAS检测结果的单位为ppt（parts per trillion，即万亿分之一，等价于纳克每升ng/l）。公共供水系统的PFAS检测结果数据，源自密歇根州《安全饮用水法案》（2020年至今）要求的全氟和多氟烷基物质最大污染物浓度（Maximum Contaminant Level, MCL）合规监测结果。 本次采样覆盖的点位包括社区供水系统（含区域及市政供水系统、预制住宅社区、居民公寓楼等），以及非瞬时非社区供水系统（含学校、企业、托育机构、密歇根州HeadStart项目点位等）。 #### 六边形多边形图层字段定义 "HexID"：每个六边形多边形的唯一标识符 "Shape_Area"：Esri创建的面积字段，单位为平方米 "Shape_Length"：Esri创建的周长字段，单位为米 #### 采样结果关联表字段定义 请注意，PFAS分析物以单独列的形式列出（单位为ppt），其中包含美国环境保护署（Environmental Protection Agency, EPA）方法537.1检测的7种受监管PFAS化合物。若结果标注为"ND"，则表示实验室未在水样中检测到浓度高于方法检出限的该类PFAS。 字段说明： "HexID"：与对应采样结果六边形格网关联的唯一标识符 "System Name"：供水系统名称 "WSSN"：供水序列号（Water Supply Serial Number），即每个公共供水系统的唯一标识符 "Sample Date"：供水系统的采样日期 "HFPO-DA"（六氟丙烯氧化物二聚酸，又称"GenX"）：密歇根州受监管分析物，MCL值为370 ppt "PFBS"（全氟丁烷磺酸）：密歇根州受监管分析物，MCL值为420 ppt "PFHxA"（全氟己酸）：密歇根州受监管分析物，MCL值为400,000 ppt "PFHxS"（全氟己烷磺酸）：密歇根州受监管分析物，MCL值为51 ppt "PFNA"（全氟壬酸）：密歇根州受监管分析物，MCL值为6 ppt "PFOA"（全氟辛酸）：密歇根州受监管分析物，MCL值为8 ppt "PFOS"（全氟辛烷磺酸）：密歇根州受监管分析物，MCL值为16 ppt "Sys Sample Code"：对应所采水样的识别编号 "Lab Name"：采用EPA方法537.1开展PFAS分析的实验室名称 "Location Name"：特定采样点位（如适用） "Lab Number"：认证实验室代码编号。注：同一实验室的"LabName"标注值可能存在差异（因数据来自两个不同数据库），"LabNumber"可用于澄清此类情况。 <2：分析物浓度未高于最低报告限（2 ppt） 本数据集代表PFAS采样点位信息，每个点位包含多次采样、各采样日期及对应分析结果，其中包含7种PFAS化合物的检出结果。检测结果以ppt为单位，1 ppt等价于20个奥林匹克规格泳池中含有1滴水。 本数据集包含一个六边形格网图层（六边形对边间距为3英里），用于展示水样采样的大致分布。该六边形格网由密歇根州环境质量部（EGLE）使用ArcGIS Online的聚合点工具创建。本图层包含一个名为"HexID"的字段，用于将采样点位的大致区域与该区域内的采样结果相关联。出于安全考虑，采样结果未关联精确点位。 本数据集用于MPART：PFAS地理信息系统（项目详情）。如需了解密歇根州PFAS应对工作的更多信息，请访问密歇根州PFAS应对官方网站。如需协助阅读或解读本数据，请拨打800-662-9278。有关饮用水采样PFAS数据的疑问，请发送邮件至[e-mail]。如需对本数据集提交反馈，请联系[e-mail]。