Michigan Dept. of Environment, Great Lakes, and EnergyThis dataset provides information on groundwater monitoring wells included in EGLE's Statewide Groundwater Monitoring Network, including well location, well construction details, lithology, and groundwater elevations (i.e., water level measurements). These data are used to observe short-term and long-term trends in groundwater elevations across Michigan, which provides information on aquifer sustainability. This information is crucial for managing current and future water use demands among multiple water use sectors, including public and private drinking water supplies, agriculture, and industry, as well as for protecting aquatic and other natural resources. EGLE's Statewide Groundwater Monitoring Network is currently under development. EGLE is working to add additional wells beginning in 2026 to the network and once available, those wells will be added to this dataset. Monitoring well data will be updated as needed as additional wells are added to the network and as additional groundwater elevation data is collected. The frequency of collection of water level measurements will vary depending on the well, ranging from continuous monitoring using sensors placed in the well, to quarterly, semi-annually, or annual water level measurements that are manually collected using an electronic water level tape. This dataset is also provided to the U.S. Geological Survey National Groundwater National Monitoring Network (NGWMN) using an ArcGIS REST API Web Service. The NGWMN is a compilation of selected groundwater monitoring wells from Federal, State, and local groundwater monitoring networks across the nation. NGWMN data can be found on the U.S. Geological Survey National Groundwater Network web application. For more information on EGLE's Statewide Groundwater Monitoring Network, please contact Sydney Ruhala, GRMD, 517-648-7791 or by email at RuhalaS@Michigan.gov NGWMN Well Sites Field Descriptions: Field Name Description SiteNo Unique well identification number or code Latitude Site latitude, in decimal degrees Longitude Site longitude, in decimal degrees (negative for Western Hemisphere) SiteName Site Name used by EGLE HorzDatum Horizontal reference datum code for the latitude and longitude of the well HorzMethod Method of measuring latitude and longitude HorzAcy Accuracy associated with latitude and longitude measurements Altitude Elevation of the land surface at the site AltUnits Code for unit of measurement associated with the Altitude field AltDatumCd Vertical reference datum code for the altitude of the well AltMethod Method of measuring altitude AltAcy Accuracy of the altitude value for the well NatAquiferNm National aquifer name used by the USGS for U.S. Principal Aquifers NatAquiferCd National aquifer code used by the USGS for U.S. Principal Aquifers LocalAquiferNm Local aquifer name LocalAquiferCd Local aquifer code StateNm Name of the state or territory within which the well resides CountyNm Name of the county within which the well resides WellDepth Depth of the well from a specified point of reference SiteType The type of groundwater site (Well or Spring) AquiferType Characteristic of the type of aquifer that the well is completed in (Confined or Unconfined). For the NGWMN, shallow semi-confined wells can be considered to be unconfined if they respond to climatic fluctuations in a relatively short period of time. CountryNm Name of the country in which the well resides AgencyCd Code for the name of the agency or organization that owns the site and/or contributed it to the network WellDepthUnits Units of measure associated with the WellDepth field. Lithology Table Field Descriptions: Field Name Field Descriptions SiteNo Unique well identification number or code SiteName Site Name used by EGLE LithologyID Code describing the gross physical characteristics used to classify the observed unit; includes standard rock term abbreviations. LithologyDescription Short description of the observed unit; includes the physical characteristics like color, texture, grain size, rock type, or composition LithologyDepthFrom Beginning depth of lithologic unit LithologyDepthFromUnit Code for unit of measure associated with LithologyDepthFrom field LithologyDepthTo Ending depth of lithologic unit LithologyDepthToUnit Code for unit of measure associated with LithologyDepthTo field Moisture Short description of level of moisture (dry, moist, wet) ObservationMethod Method for classifying lithology of the observed unit SiteID Site name used by the U.S. Geological Survey National Groundwater Monitoring Network Well Construction Table Field Descriptions: AgencyCd Code for the name of the agency or organization that owns the site and/or contributed it to the network SiteNo Unique well identification number SiteName Site name used by EGLE ScreenDepthFrom Beginning depth of screened interval ScreenDepthFromUnit Code for unit of measure associated with ScreenDepthFrom field ScreenDepthTo Ending depth of screened interval ScreenDepthToUnit Code for unit of measure associated with ScreenDepthTo field ScreenMaterial Screen type or material ScreenDiameter Internal diameter of screen ScreenDiameterUnit Code for unit of measure associated with ScreenDiameter field ScreenSlotSize Screen slot size ScreenSlotSizeUnit Code for unit of measure associated with ScreenSlotSize field CasingDepthFrom Beginning depth of cased interval CasingDepthFromUnit Code for unit of measure associated with CasingDepthFrom field CasingDepthTo Ending depth of cased interval CasingDepthToUnit Code for unit of measure associated with CasingDepthTo field CasingMaterial Casing type or material CasingDiameter Internal diameter of casing CasingDiameterUnit Code for unit of measure associated with CasingDiameter field FilterPacked Identifies if the well was filter packed WellGrouted Identifies if the well was grouted GroutingMaterial Grouting material used during well installation SiteID Site name used by the U.S. Geological Survey National Groundwater Monitoring Network CasingHeight Height of top of well casing in feet. Positive if above ground surface, negative if below ground surface Water Level Measurements Table Field Descriptions: AgencyCd Code for the name of the agency or organization that owns the site and/or contributed it to the network SiteNo Unique well identification number SiteName Site name used by EGLE Time Date and time of the static water level measurement. Measurement time collected in UTC-5 (UTC-4 during daylight savings) . DataProvidedBy Code for the agency that performed the static water level measurement DepthToWater Depth to water in feet below land surface; Equals Field Measurement minus CasingHeight WaterLevel Elevation of water level in feet relative to NAVD88 ObservationMethod Method of static water level measurement AccuracyValue Accuracy of static water level measurement AccuracyUnit Code for unit of measure associated with the AccuracyValue field Approve Indicating whether this water level measurement has been reviewed and accepted by EGLE's Groundwater Data Unit; this dataset contains only measurements that have been accepted by EGLE's Groundwater Data Unit. FieldMeasurement Depth to water in feet below top of casing. Measured by staff in the field SiteID Site name used by the U.S. Geological Survey National Groundwater Monitoring NetworkArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/4af0b19af2204d49b959dfeebeface2d_1engState of Michigan Open Data PortalPublicLithology Table [Michigan]Web servicesMichiganLast Modified: 2026-03-17