Michigan Dept. of Environment, Great Lakes, and EnergyMany businesses utilize underground storage tanks for products such as gasoline, diesel fuel, and other liquid chemicals. Environmental damages and safety risks can result from improper installation and maintenance as well as degradation of the tanks over time. The design, construction, installation and maintenance of underground storage tanks that store regulated substances are licensed under Part 211, Underground Storage Tank Regulations, of the Natural Resources and Environmental Protection Act, 1994 PA 451, as amended (NREPA) by the Michigan Department of Licensing and Regulatory Affairs (LARA). Those underground storage tanks that require corrective actions due to a release are regulated under Part 213, Leaking Underground Storage Tanks, of NREPA by the Michigan Department of Environment, Great Lakes, and Energy (EGLE). This data layer shows the locations of known underground storage tanks in Michigan including those that have a record of a release. This data is regularly updated. Field Name Alias Description OBJECTID N/A N/A ADDRESS Address Street address for the location CITY City City associated with the street address ZIPCODE Zip Code Zip code of the location LATITUDE Latitude Latitude (Y Coordinate) of the location. LONGITUDE Longitude Longitude (X Coordinate) of the location. FacilityID Facility ID The identification number assigned to the underground storage tank facility. Also referred to as Location ID. FacilityName Facility Name The name of the underground storage tank facility. Also referred to as Location Name ProjectManager ProjectManager The RRD staff person assigned to manage the location County County County where the site is located WorkUnit WorkUnit The EGLE district which contains the location HorizontalReferenceDatum Horizontal Reference Datum Horizontal Reference Datum HorizontalCollectionMethod Horizontal Collection Method Method of collection HorizontalAccuracy Horizontal Accuracy An estimated measure of the horizontal accuracy of the point ReferencePoint Reference Point Provides a description of the relationship between the point feature and the overall location ScaleNum Scale Number The representative fraction or scale at which the point feature was mapped TotalTank Total Tank Total number of underground storage tanks at a location ActiveTank Active Tank Total number of active underground storage tanks at a location TotalRelease Total Release The total number of known releases (e.g., spilling, leaking, emitting, discharging, escaping, or leaching from an underground storage tank system into groundwater, surface water, or subsurface soils) that have occurred at the location. OpenRelease Open Release The number of releases at a locationfor which actions have not been taken to address contamination resulting from the tank releases (leaks). ClosedRelease ClosedRelease The number of releases at a location for which corrective actions have met the applicable risk-based target levels ReleaseStatus ReleaseStatus The overall status of the location based on releases from all known USTs. Open = 1 or more open releases Closed = 0 open releases RegulatoryProgram RegulatoryProgram Indicates whether a location is a registered location under Part 211 and/or regulated under Part 213. Note that all Part 213 locations are also Part 211. CurrentClassification CurrentClassification The most recently reported classification for the location's degree of risk to the public and the environment consistent with ASTM Risk-Based Corrective Action (RBCA) and Part 213, i.e., 1) immediate, 2) short-term, 3) long-term, 4) no demonstrable long-term unacceptable risk based on current use, or 5) no demonstrable long-term unacceptable risk based on current and reasonably anticipated future use. PreviousClassification PreviousClassification The classification reported prior to the current one for the location's degree of risk to the public and the environment consistent with ASTM Risk-Based Corrective Action (RBCA) and Part 213. HighestClassification HighestClassification The reported classification representing the maximum hazard or greatest exposure throughout time for the location based on the degree of risk to the public and the environment consistent with ASTM Risk-Based Corrective Action (RBCA) and Part 213. RiskCondition RiskCondition An overall assessment of risk and required corrective actions at the location Restrictions Property Restriction Restrictions - indicates whether EGLE has knowledge of a land or resource use restriction that has been imposed at the location. HasBEA Has BEA Indicates whether a baseline environmental assessment has been submitted to EGLE at the location. LastUpdated LastUpdated The date the point was updated Recent Changes: Attributes available in this layer have changed as part of EGLE's transition from Environmental Mapper to RIDE Mapper. Additional information is provided such as the number of tanks at each location as well as the number of total releases and open releases. As a result, an additional step is required to display Part 211 sites as active or closed, or to display leaking underground storage tank sites as open or closed. A new definition query or filter will help you accomplish this. The table below shows the relationships between fields in the old feature class and new as well as the query that can be used to view Active/Closed Part 211 sites and Open/Closed Part 213 sites using the new data structure. Mapped Feature Represents Old Attribute Query to Apply Leaking Underground Storage Tanks (Part 213 Open) Site with tank(s) having one or more releases. [OPENLUST] = [Open_Release] ≥ 1. Leaking Underground Storage Tanks (Part 213 Closed) Site with tank(s) where release(s) existed but have since been closed. [CLOSLUST] = [Total_Release] ≥ 1 AND [Open_Release] = 0. Underground Storage Tanks (Part 211 Active) Site with active tank(s) but no releases have been reported. [ACTVSITE] = [Total_Tank] ≥ 1 AND [Active_Tank] ≥ 1 Underground Storage Tanks (Part 211 Closed) Site where tank(s) existed but are either inactive or have been removed. [CLOSSITE] = [Total_Tank] ≥ 1 AND [Active_Tank] =0 For more information about this data, please contact Matt Warner at WarnerM1@Michigan.gov .ArcGIS DynamicMapLayerhttps://hub.arcgis.com/datasets/731333dca06b48ce9bcf57d6be7b653f_1engState of Michigan Open Data PortalPublicUnderground Storage Tanks [Michigan]Web servicesMichiganLast Modified: 2025-09-24