Michigan Public Water Supply Sampling Hexbins and Results

Note that this layer contains the same information as Michigan Public Water Supply Sampling Hexbins and Results (Consolidated). They are distinct in structure only (the data is essentially the same; note a small distinction in the Terms of Use). This is a single flattened file, while the other is a hexbin layer with a related table containing results. The time series data shows the Public Drinking Water Supply PFAS sample results hexbin data from August 2020 to January 2026 (last updated). The data was agregated into 3 mile hexagons (hexbins) to show the distribution of public water supply PFAS sample locations across the State of Michigan. There is a hexbin for each public water supply PFAS sample. So, there will be multiple hexbins for the same public water supply with more than one PFAS drinking water sample taken. 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 sampling results 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 ObjectID Unique identification number generated by the ESRI software 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. 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. 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（整合版）》所含信息完全一致，二者仅结构存在差异（数据本质相同；需注意使用条款存在细微区别）。本数据集为单一扁平化文件，而另一版本为关联结果表的六边形格网（hexbin）图层。 本时序数据涵盖2020年8月至2026年1月（最新更新时间）的密歇根州公共饮用水供水全氟和多氟烷基物质（PFAS）采样结果六边形格网数据。数据被聚合为3英里边长的六边形格网，用于展示密歇根州境内公共供水PFAS采样点位的分布情况。每个公共供水PFAS采样点对应一个六边形格网，因此同一公共供水系统若采集了多份饮用水PFAS样品，则会对应多个六边形格网。 本次采样覆盖的点位包括社区供水系统（涵盖区域及市政供水、移动住房社区、居民公寓楼等）以及非临时性非社区供水系统（涵盖学校、企业、托育机构、密歇根州先行教育计划（Head Start）点位等）。 采样结果表中各项信息的定义如下： 请注意，PFAS分析物以单独列项呈现（单位为ppt，万亿分之一（parts per trillion, ppt）），其中包含美国环境保护署（EPA）方法537.1规定检测的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出浓度高于方法报告限的PFAS物质。 字段说明： ObjectID：由ESRI软件（ESRI）生成的唯一标识编号 HexID：与特定采样结果六边形格网关联的唯一ID System Name：供水系统名称 WSSN：供水序列号（Water Supply Serial Number），为每个公共供水系统分配的唯一标识符 Sample Date：供水系统的采样日期 HFPO-DA（六氟环氧丙烷二聚酸，亦称为“GenX”）：密歇根州受监管分析物，最大污染物水平（Maximum Contaminant Level, MCL）=370 ppt PFBS（全氟丁烷磺酸）：密歇根州受监管分析物，MCL=420 ppt PFHxA（全氟己酸）：密歇根州受监管分析物，MCL=400,000 ppt PFHxS（全氟己烷磺酸）：密歇根州受监管分析物，MCL=51 ppt PFNA（全氟壬酸）：密歇根州受监管分析物，MCL=6 ppt PFOA（全氟辛酸）：密歇根州受监管分析物，MCL=8 ppt PFOS（全氟辛烷磺酸）：密歇根州受监管分析物，MCL=16 ppt Sys Sample Code：对应所采样品的标识编号 Lab Name：采用EPA方法537.1开展PFAS分析的实验室名称 Location Name：适用时的具体采样点位名称 Lab Number：认证实验室代码编号。注意：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。 本数据集代表PFAS采样点位信息，每个点位采集了多份样品，包含每份样品的采样日期及分析结果。这些分析结果涵盖7种PFAS化合物的检出情况，结果以ppt为单位。1 ppt等价于20个标准奥林匹克规格泳池中含有1滴水。 本数据集包含一个3英里边长的六边形格网图层，用于展示水样采样的大致位置。该六边形格网由密歇根州环境、大湖与能源部（EGLE）使用ArcGIS Online（ArcGIS Online）的聚合点工具创建。此图层包含一个名为“HexID”的字段，用于将格网大致位置与该格网范围内的样品检测结果相关联。出于安全考虑，结果未关联精确采样点位。 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响应官方网站。如需读取或解读本数据的协助，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]。